This document summarizes a study that used finite element analysis and Monte Carlo simulation to analyze the probabilistic design and random optimization of an aerofoil wing made of composite materials. The study modeled an NACA0012 aerofoil composite structure in ANSYS and varied design parameters like chord length, ply angle, elastic modulus, and loading conditions randomly to analyze uncertainty in bending stress. Over 1000 simulations were run. Optimization was also performed to find a set of design variables that reduced the bending stress objective function. The best set reduced bending stress from 1131.79 N/mm2 to 180.58 N/mm2. The study concluded there was significant uncertainty when chord length and ply angle varied and provided correlations between design variables and bending
Probabilistic Design Hollow of Airfoil Wing by Using Finite Element MethodIJERA Editor
This study represents simulation of Airfoil composite beam by using Monte Carlomethod. A three dimensional static analysis of large displacement type has been carried out. Finite element analysis of NACA0012 airfoil composite structure has been carried out and uncertainty in bending stress is analyzed. Bending stress was objective function. Chord length , beam length ,elastic modulus in XY,YZ,XZ,shear modulus of epoxy graphite in in XY,YZ,XZ, ply angle and ply thickness of airfoil section, force are varied within effective range and their effect on bending stress has been analyzed. In order to validate the results, one loop of simulation is benchmarked from results in literature. Ultimately, best set of probabilistic design variable is proposed to reduce bending stress under static loading condition.
Using Imperialist Competitive Algorithm to Find the Optimum Shape Design of I...CSCJournals
In this paper, Imperialist Competitive Algorithm (ICA) and Genetic Algorithm (GA) are used to find the optimal form for torispherical dome ends under internal pressure load. According to fabrication and strength of material requirements, a group of compromised counters are studied. According to ASME Section VIII and BS5500 pressure vessel codes, a reasonable buckling pressure limit is proposed. Four-centered ellipse method is used to describe the geometry of the torispherical dome end that this method is commonly used in engineering drawing. A minimum weight optimization problem based on buckling pressure is studied. Two different size torispherical dome end examples are selected and studied. Imperialist Competitive Algorithm is found to be very efficient and easy to use for the applications, such as torispherical dome end and subjected to internally pressurized loading.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Probabilistic Design Hollow of Airfoil Wing by Using Finite Element MethodIJERA Editor
This study represents simulation of Airfoil composite beam by using Monte Carlomethod. A three dimensional static analysis of large displacement type has been carried out. Finite element analysis of NACA0012 airfoil composite structure has been carried out and uncertainty in bending stress is analyzed. Bending stress was objective function. Chord length , beam length ,elastic modulus in XY,YZ,XZ,shear modulus of epoxy graphite in in XY,YZ,XZ, ply angle and ply thickness of airfoil section, force are varied within effective range and their effect on bending stress has been analyzed. In order to validate the results, one loop of simulation is benchmarked from results in literature. Ultimately, best set of probabilistic design variable is proposed to reduce bending stress under static loading condition.
Using Imperialist Competitive Algorithm to Find the Optimum Shape Design of I...CSCJournals
In this paper, Imperialist Competitive Algorithm (ICA) and Genetic Algorithm (GA) are used to find the optimal form for torispherical dome ends under internal pressure load. According to fabrication and strength of material requirements, a group of compromised counters are studied. According to ASME Section VIII and BS5500 pressure vessel codes, a reasonable buckling pressure limit is proposed. Four-centered ellipse method is used to describe the geometry of the torispherical dome end that this method is commonly used in engineering drawing. A minimum weight optimization problem based on buckling pressure is studied. Two different size torispherical dome end examples are selected and studied. Imperialist Competitive Algorithm is found to be very efficient and easy to use for the applications, such as torispherical dome end and subjected to internally pressurized loading.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Probabilistic Design of Hollow Circular Composite Structure by using Finite E...IJERA Editor
This study represents simulation of hollow circular composite beam by using Monte Carlo method .A three
dimensional static analysis of large displacement type has been carried out. Finite element analysis of hollow
circular composite structure has been carried out and uncertainty in bending stress is analyzed. Bending stress
was objective function. Beam length, beam radius, elastic modulus, shear modulus and Poisson ratio of epoxy
graphite, ply angles of hollow circular section, radius and force are randomly varied within effective range and
their effect on bending stress has been analyzed. In order to validate the results, one loop of simulation is
benchmarked from results in literature. Ultimately, best set of probabilistic design variable is proposed to reduce
bending stress under static loading condition.
Numerical Simulation of Impact of Truncated Cone Projectile On Thin Aluminum ...IJERA Editor
In this paper numerical study of normal impact of truncated cone projectile on Aluminum plate of 0.82 mm
thicknessis carried out. Projectile is rigidly hardened and the major diameter and mass of projectile is taken as
12.8 mm and 25.8 g respectively. Numerical simulation is carried out on Abaqus explicit, Johnson-cock model is
used to define the thermoviscoplastic behavior of the material constituting the plate, The Johnson–Cook fracture
criterion has been coupled with homogeneous behavior to predict complete perforation process. Axi-symmetric
simulation is performed, material properties of Aluminum is taken from previously published results, whereas
projectile is taken as analytic rigid.
Experimental Investigation and Analysis of Extrusion of Lead from Round Secti...IOSR Journals
Abstract : An experimental investigation has been done on the changes of die angle, area reduction in dies,
loading rate on the final extruded products, extrusion pressures of lead of circular cross sections of different
length. The proposed method is successfully adapted to the extrusion of the equilateral triangular section from
round billet through converging dies of different area reductions. Computation of extrusion pressure at various
area reductions and finite element analysis of different parameters (stress, strain, velocity) both in dry and wet
condition.
Keywords - Converging dies, Extrusion of the equilateral triangular section, Extrusion Pressure
Fe investigation of semi circular curved beam subjected to out-of-plane loadeSAT Journals
Abstract Curved beams are used as machine or structural members in many applications. Based on application of load they can be classified into two categories. Curved beams subjected to In-Plane loads are more familiar and are used for crane hooks, C-clamps etc. The other categories of curved beams are the ones that are subjected to out-of-plane loads. They find applications in automobile universal joints, raider arms and many civil structures etc.The results of this research on semicircular curved beam subjected to out-of-plane loads have revealed some interesting results. For semicircular curved beams subjected to out-of-plane loads, it is shown that every section is subjected to a combination of transverse shear force, bending moment and twisting moment. By using ANSYS tool it is shown that Maximum principal stress occurs at section 120 degrees from the section containing the loading line. Moreover it is observed that fixed end of this curved beam is subjected to a state of pure shear. Key Words: Semi circular curved beam, Stress in curved beam, Out-of-plane load, FE analysis.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Buckling behavior of straight slot tubesunder oblique loading – A comparative...IJAEMSJORNAL
Hollow tubes are the most important or crucial parts of the rapidly growing automobile and construction industry. The tube is subjected to pure buckling. In theanalysis, one end is fixed and the force is applied to theother end and by application of different angles of inclinations ranging from 0˚ to 20˚ with different thicknessof the range of 0.5 to 2.0. Linear buckling code was used forfinding the critical buckling load. This research paper is about the effects of buckling under oblique loading. It is the process in which the tube is subjected to compressive oblique loading and the tube fails by the first increase in crossectional area and then bulging on any of the sides but in the case, oblique loading in hollow tube shell bulges internally or inside the perimeter of the tube.
Investigation of Extrusion of Lead experimentally from Round section through ...inventy
ABSTRACT :The changes of die angle, area reduction in dies, loading rate on the final extruded products, extrusion pressures of lead of circular cross sections has been investigated experimentally. The proposed method is successfully adapted to the forward extrusion of the equilateral triangular section from round billet through converging dies of different area reductions. Computation of extrusion pressure at various area reductions and calculations of different parameters (stress, strain etc.) in wet condition.
Keywords - Extrusion of Triangular section, Converging Dies at different area reductions, Friction Factor, Extrusion Pressure
Finite Element Analysis of Obround Pressure VesselsIJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
Forming Limit Prediction of High Tensile Strength Steel using FEA SimulationIJERD Editor
Forming limit prediction of High Tensile Strength Steel (HTSS) sheet was carried out by using finite element analysis. JSTAMP/NV was used in the finite element analysis. Thickness of HTSS specimen was 1.0mm, and the length was 120mm.And the width was varied from 20mm to 80mm. Stretching test was operated by Erichsen test. In this study, the forming limit prediction method for predicting the localized necking before the fracture was proposed.FLD of HTSS was compared between experimental results and analytical results. Forming limit diagrams (FLD) obtained by FEAagreed well with the FLD obtained by experiment.
Probabilistic Design of Hollow Circular Composite Structure by using Finite E...IJERA Editor
This study represents simulation of hollow circular composite beam by using Monte Carlo method .A three
dimensional static analysis of large displacement type has been carried out. Finite element analysis of hollow
circular composite structure has been carried out and uncertainty in bending stress is analyzed. Bending stress
was objective function. Beam length, beam radius, elastic modulus, shear modulus and Poisson ratio of epoxy
graphite, ply angles of hollow circular section, radius and force are randomly varied within effective range and
their effect on bending stress has been analyzed. In order to validate the results, one loop of simulation is
benchmarked from results in literature. Ultimately, best set of probabilistic design variable is proposed to reduce
bending stress under static loading condition.
Numerical Simulation of Impact of Truncated Cone Projectile On Thin Aluminum ...IJERA Editor
In this paper numerical study of normal impact of truncated cone projectile on Aluminum plate of 0.82 mm
thicknessis carried out. Projectile is rigidly hardened and the major diameter and mass of projectile is taken as
12.8 mm and 25.8 g respectively. Numerical simulation is carried out on Abaqus explicit, Johnson-cock model is
used to define the thermoviscoplastic behavior of the material constituting the plate, The Johnson–Cook fracture
criterion has been coupled with homogeneous behavior to predict complete perforation process. Axi-symmetric
simulation is performed, material properties of Aluminum is taken from previously published results, whereas
projectile is taken as analytic rigid.
Experimental Investigation and Analysis of Extrusion of Lead from Round Secti...IOSR Journals
Abstract : An experimental investigation has been done on the changes of die angle, area reduction in dies,
loading rate on the final extruded products, extrusion pressures of lead of circular cross sections of different
length. The proposed method is successfully adapted to the extrusion of the equilateral triangular section from
round billet through converging dies of different area reductions. Computation of extrusion pressure at various
area reductions and finite element analysis of different parameters (stress, strain, velocity) both in dry and wet
condition.
Keywords - Converging dies, Extrusion of the equilateral triangular section, Extrusion Pressure
Fe investigation of semi circular curved beam subjected to out-of-plane loadeSAT Journals
Abstract Curved beams are used as machine or structural members in many applications. Based on application of load they can be classified into two categories. Curved beams subjected to In-Plane loads are more familiar and are used for crane hooks, C-clamps etc. The other categories of curved beams are the ones that are subjected to out-of-plane loads. They find applications in automobile universal joints, raider arms and many civil structures etc.The results of this research on semicircular curved beam subjected to out-of-plane loads have revealed some interesting results. For semicircular curved beams subjected to out-of-plane loads, it is shown that every section is subjected to a combination of transverse shear force, bending moment and twisting moment. By using ANSYS tool it is shown that Maximum principal stress occurs at section 120 degrees from the section containing the loading line. Moreover it is observed that fixed end of this curved beam is subjected to a state of pure shear. Key Words: Semi circular curved beam, Stress in curved beam, Out-of-plane load, FE analysis.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Buckling behavior of straight slot tubesunder oblique loading – A comparative...IJAEMSJORNAL
Hollow tubes are the most important or crucial parts of the rapidly growing automobile and construction industry. The tube is subjected to pure buckling. In theanalysis, one end is fixed and the force is applied to theother end and by application of different angles of inclinations ranging from 0˚ to 20˚ with different thicknessof the range of 0.5 to 2.0. Linear buckling code was used forfinding the critical buckling load. This research paper is about the effects of buckling under oblique loading. It is the process in which the tube is subjected to compressive oblique loading and the tube fails by the first increase in crossectional area and then bulging on any of the sides but in the case, oblique loading in hollow tube shell bulges internally or inside the perimeter of the tube.
Investigation of Extrusion of Lead experimentally from Round section through ...inventy
ABSTRACT :The changes of die angle, area reduction in dies, loading rate on the final extruded products, extrusion pressures of lead of circular cross sections has been investigated experimentally. The proposed method is successfully adapted to the forward extrusion of the equilateral triangular section from round billet through converging dies of different area reductions. Computation of extrusion pressure at various area reductions and calculations of different parameters (stress, strain etc.) in wet condition.
Keywords - Extrusion of Triangular section, Converging Dies at different area reductions, Friction Factor, Extrusion Pressure
Finite Element Analysis of Obround Pressure VesselsIJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
Forming Limit Prediction of High Tensile Strength Steel using FEA SimulationIJERD Editor
Forming limit prediction of High Tensile Strength Steel (HTSS) sheet was carried out by using finite element analysis. JSTAMP/NV was used in the finite element analysis. Thickness of HTSS specimen was 1.0mm, and the length was 120mm.And the width was varied from 20mm to 80mm. Stretching test was operated by Erichsen test. In this study, the forming limit prediction method for predicting the localized necking before the fracture was proposed.FLD of HTSS was compared between experimental results and analytical results. Forming limit diagrams (FLD) obtained by FEAagreed well with the FLD obtained by experiment.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
PROBABILISTIC DESIGN AND RANDOM OPTIMIZATION OF HOLLOW RECTANGULAR COMPOSITE ...IAEME Publication
This study represents simulation of hollow rectangular composite beam by using Monte Carlo method i.e. direct sampling. A three dimensional transient analysis of large displacement type has been carried out. Finite element analysis of hollow rectangular composite structure has been
carried out and uncertainty in Bending Stress is analyzed. More over optimization of selected design variables has been carried out by using random optimization method. Bending Stress was objective function. Beam length, elastic modulus of epoxy graphite, ply angles of hollow rectangular composite section, radius and force are randomly varied within effective range and their effect on Bending Stress has been analyzed.
PROBABILISTIC DESIGN AND RANDOM OPTIMIZATION OF HOLLOW CIRCULAR COMPOSITE STR...IAEME Publication
This study represents simulation of hollow circular composite beam by using Monte Carlo method i.e. direct sampling. A three dimensional transient analysis of large displacement type has been carried out. Finite element analysis of hollow circular composite structure has been carried out and uncertainty in bending stress is analyzed. More over optimization of selected design variables has been carried out by using random optimization method.
Modelling and Analysis of Hybrid Composite Joint Using Fem in AnsysIOSR Journals
Abstract: Composite materials are widely used in the various Fields. Due to the high strength they are widely
used in the low weight constructions and also used as a suitable alternative to metals. In various applications
and also for joining various composite parts together, they are fastened together using adhesives or Mechanical
fasteners. Modeling and static analysis of 3-D Models of joints such as bonded, riveted and hybrid. The results
were found in terms of vonmises stress, shear stress, and normal stress for stress distribution. ANSYS FEA tool
has been used for stress distribution characteristics of various configurations of double riveted single lap joint
with three joining methods namely bonded, riveted and hybrid the present study deals with the analysis of single
lap joint subjected to the given tensile load and the stress distribution in the members under various design
conditions are found.
Analytical Investigation on External Beam-Column Joint Using ANSYS By Varying...IJERA Editor
The beam-column joint has been a topic of study for over 30 years now and still there are many things that yet to
be completely understood. The joint was considered to be rigid, however researches have shown that failure may
occur at the joint instead of the beam or column. This study was carried out to determine the effect of the
diameter of longitudinal reinforcement of the beam on the strength, deformation and ductility in the beamcolumn
joint using ANSYS. It was seen that the load carrying capacity and the deformation increases as the
diameter of reinforcement in the beam increases.
Effect of lamination angle on maximum deflection of simply supported composit...RAVI KUMAR
In this project a composite laminated beam is studied with glass-epoxy and graphite-epoxy combination. The beam is composed of four layers of different combination of composite material (glass epoxy and graphite epoxy composite). The beam is simply supported at both the ends and is subjected to uniformly distributed load along the length. Transverse deflection is computed for different lamination angle (0^0-〖90〗^0) by using Euler- Bernoulli’s theory (or CLPT). Maximum transverse deflection analysis is carried out using derived analytical expressions. The research carried out in this project will enable to determine the beam strength due to bending loads. The importance of fibre reinforcement in the manufacturing of the beam is studied in terms of bending strength of the beam. MATLAB codes are generated to implement analytical expiations of the composite beam.
The main objective of the paper is to find out the lamination angle at which minimum deflection is obtained & to find out the effect of lamination angle on maximum transverse deflection of the beam.
Stress Analysis of FRP Composite Cylinder with Closed EndsIOSR Journals
Composite cylinders made of a polymer matrix such as epoxy reinforced with glass or carbon fibers possess extremely high strength. Proper modeling of FRP composite cylinder is very essential for many applications. FRP composite cylinders are commonly used in the aerospace, automotive, marine and construction industries. The present work is to study the variation of stressesat the top end, middle and bottom end portions of a composite cylinder by varying the diameter to thickness ratio(S) and fiber angle (θ).The four layered angle ply (θ0/-θ0/-θ0/θ0) composite cylinder is considered forthe present work and behavior of each portion (Top end, middle and Bottom end) is studied.For the present work composite cylinder is modeled in ANSYS and analysis was carried out using numerical software. It isfound thatthe increment of stress takes place linearly with respect to D/t ratio due to reduction in thickness of the layer.The critical fiber angle is 45⁰ to 60⁰ as it offers high resistance against axial and circumferential deformation in middle and end portions.
NONLINEAR FINITE ELEMENT ANALYSIS FOR REINFORCED CONCRETE SLABS UNDER PUNCHIN...IAEME Publication
This paper presents an implementation of a three-dimensional nonlinear finite element model for evaluating the behavior of reinforced concrete slabs under centric load. The concrete was idealized by using eight-nodded solid elements. While flexural reinforcement and the shear were modeled as line elements, a perfected bond between solid elements and line elements was assumed. The nonlinear behavior of concrete in compression is simulated by an elasto-plastic work-hardening model, and in tension a suitable post-cracking model based on tension stiffening and shear retention models are employed. The steel was simulated using an elastic-full plastic model. The validity of the theoretical formulations and the program used was verified through comparison with available experimental data, and the agreement has proven to be good. A parametric study has been also carried out to investigate the influence of the slab thickness on column-slab connection response
Low cycle biaxial fatigue behavior of direct aged Nickel-based 718 superalloy IJERA Editor
In recent years, significant advances in the fabrication process of nickel-base supperalloy leading to grain size
reduction have been made in order to improve fatigue properties of aircraft turbine discs. Indeed, a change in
particle size affects the initiation mode of fatigue cracks as well as the fatigue life of the material. The present
study aims to investigate the fatigue behavior of a newly developed nickel-based superalloy under biaxial-planar
loading. Low Cycle Fatigue (LCF) tests are performed at different stress ratios to study the influence of the
multiaxial stress state on the fatigue life of the material. Full-field displacement and strain measurements as well
as crack initiation detection are obtained using Digital Image Correlation (DIC) techniques. Results related to
different load ratios are presented and an appropriate biaxial lifetime prediction is given. Crack detection, strain
amplitude and number of cycles to crack initiation vs. triaxial stress ratio for each loading case are mentionned.
From fractographic investigations by scanning electron microscopy it is found that the mechanism of fatigue
crack initiation does not depend on the triaxial stress ratio and that most fatigue cracks initiate from subsurface
carbides.
Determination of Stress Intensity Factor for a Crack Emanating From a Rivet ...IJMER
Modern aircraft structures are designed using a damage tolerance philosophy. This design philosophy envisions sufficient strength and structural integrity of the aircraft to sustain major damage and to avoid catastrophic failure. The rivet holes location are one of the stress concentration region in fuselage skin. The current study includes a curved sheet with rivet holes is considered as part of the
fuselage skin. During the service life of aircraft fatigue cracks will emanate from rivet holes simultaneously as they experience identical stresses due to internal pressure. In fracture mechanics, Stress Intensity Factor (SIF) is an important criterion to evaluate the impact of crack as the magnitude of SIF determines the propagation of crack. The objective is to investigate the SIF for crack emanating from one rivet hole and approaching another using isplacement Extrapolation Method (DEM) in F.E.M that would aid in the determination of the critical nature of such cracks.
Numerical modeling on behaviour of reinforced concrete exterior beam column j...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Design, Analysis and weight optimization of Crane Hook: A Reviewijsrd.com
Crane hook are highly liable component and are always subjected to failure due to accumulation of large amount of stress which can eventually lead to its failure .In this present work, to study the different design parameter & stress pattern of crane hook in its loaded condition for different cross section, the design and drafting of crane hook will be prepared by using ANSYS 14.5. By finite element analysis, the stress which is to be formed in various cross section are compared with design calculation .The stress concentration factors are used in strength and durability evaluation of structure and machine element. In this work and also we observe the parameter that affects the weight reduction.
A computational approach for evaluating helical compression springseSAT Journals
Abstract Helical compression springs are generally synthesized and evaluated by determining the maximum torsional stress, fatigue life, natural frequency, and/or load loss due to stress relaxation. To this end, researchers have developed finite element analysis (FEA) modeling methods to simulate the design performance of helical compression springs. The intent of this paper was to make a useful contribution to the published works for evaluating round wire helical compression springs. Specifically, commercially available FEA software was used to construct a structural model of a helical compression spring to simulate its full range of compression. The proposed FEA modeling methodology considers coil-to-coil contact and the end coils were modeled as rigid surfaces. With 9 mm of compression, the predicted spring rate correlated with the analytically calculated value to within 5%. Keywords: Helical compression spring, machine component design, spring FEA
Experimental investigation on buckling of GFRP cylindrical shells subjected t...IOSR Journals
Composite cylindrical shells are being used in submarine, underground mines, aerospace applications and other civil engineering applications. Thin cylindrical shells are more prone to fail in buckling rather than material failure. An experimental study on buckling of glass fiber reinforced plastics layered composite cylindrical shells under displacement and load controlled static axial compression are reported The experimental results are compared with general purpose finite element program (ANSYS). Limit point loads evaluated for geometric imperfection magnitudes shows an excellent agreement with experimental results which clearly indicates the confidence gained on the numerical results presented. Present study finds direct application to qualitatively investigate the influence of geometric imperfection on other advanced grid-stiffened structures.
“Investigation of Structural Analysis of Composite Beam Having I- Cross Secti...IOSR Journals
Abstract: - In structural applications, beam is one of the most common structural members that have been
considered in design. This paper is intended to provide tools that ensure better designing options for composite
laminates of I -beam. In this Paper an analytical method & FEM approach calculating axial stiffness , Axial
stress ,Axial strain of flange and web laminates. The results show the stacking sequence and fiber angle
orientation strongly affects strength of composite I-beam.
Comparative Study on Anchorage in Reinforced Concrete Using Codes of Practice...IJERA Editor
The evaluations of anchorage strength of bars in reinforced concrete are varied in codes of practice and
equations by researchers on the base of their approaches and philosophies.
This paper (Part I) aims to have a comparative study between the predictions by codes of practice of BS8110
and EC2 and those equations by Darwin et al, Morita and Fuji, Batayneh and Nielsen and results of 164 tests
from literature.
In this part the case of straight anchorage bars without transverse pressure is considered. Some major parameters
including compressive strength, and in terms of ratio of concrete cover to bar diameter and ratio of anchorage
length to bar diameter , are addressed in detail.
Although various parameters are involved in anchorage design equations, it is observed that every code has
merit over the other codes in some aspect. The presented discussion highlights the major areas of differences
which need attentions in the future for more investigations.
The main conclusion has been presented in part II to include the study of straight anchorages with transverse
pressure. The conclusions should cover the both cases to obtain the fair assessments for bond strength by those
expressions used in this study.
Profile modification of adhesively bonded cylindrical joint for maximum torqu...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
Contact Pressure Validation of Steam Turbine Casing for Static Loading ConditionIJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
Learn about:
• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
• Visual Testing: Explore the emerging capabilities of AI in visual testing and how it's set to revolutionize UI verification.
• Inflectra's AI Solutions: See demonstrations of Inflectra's cutting-edge AI tools like the ChatGPT plugin and Azure Open AI platform, designed to streamline your testing process.
Whether you're a developer, tester, or QA professional, this webinar will give you valuable insights into how AI is shaping the future of software delivery.
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
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Epistemic Interaction - tuning interfaces to provide information for AI support
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1. Sachin M. Shinde et al. Int. Journal of Engineering Research and Application ww.ijera.com
Vol. 3, Issue 5, Sep-Oct 2013, pp.13-18
www.ijera.com 13 | P a g e
Probabilistic Design and Random Optimization of Aerofoil Wing
by Using Finite Element Method
Mr.Sachin M. Shinde*,Prof.Dr.B.P. Ronge**, Prof.Dr.P.M.Pawar**
*(Student, Department of Mechanical Engineering, SVERI’s College of Engineering,Pandhapur)
** (Professor, Department of Mechanical Engineering, SVERI’s College of Engineering, Pandhapur)
ABSTRACT: This study represents simulation of aerofoil composite beam by using Monte Carlo method
i.e.direct sampling. A three dimensional transient analysis of large displacement type has been carried out.Finite
element analysis of NACA0012 aerofoil composite structure has been carried out and uncertainty in bending
stress is analyzed. More over optimization of selected design variables has been carried out by using random
optimization method. Bending stress was objective function.Chord length , elastic modulus of epoxy graphite,
ply angle of aerofoil section, Beam length , moment of inertia and force are randomly varied within effective
range and their effect on bending stress has been analyzed.In order to validate the results, one loop of simulation
is benchmarked from results in literature. Ultimately, best set of optimized design variable is proposed to reduce
bending stress under different loading condition.
Key words: -Aerofoil wing, Monte Carlo Simulation, Random Optimization.
I. INTRODUCTION
Composite materials have found increasing
use in aerospace and civil engineering construction.
One of the common areas of application is panels and
aerofoils construction where composite materials
with complex lay-ups are used. The following
properties can be improved when composite materials
are used: specific strength, specific stiffness, weight,
and fatigue life. The thin-walled beams of open cross-
sections are used extensively in space systems as
space erectable booms installed on space craft; in
aeronautical industry both as direct load-carrying
members and as stiffener members. In addition, they
are used as well in marine and civil engineering,
whereas the I-beams, in the fabrication of flex beams
of bearing less helicopter rotor [1].Thin- walled
structures are integral part of an aircraft [2]. That is
the reason why many researchers consider it in their
studies and published it in scholarly articles. Chan
and his students focused on thin-walled beams with
different cross-sections.Among their studies, Chan
and Dermirhan [3] considered first a circular cross
section thin-walled composite beam. They developed
a new and simple closed-form method to calculate its
bending stiffness. Then, Lin and Chan [4] continued
the work with an elliptical cross section thin-walled
composite beam. Later, Syed and Chan [5] included
hat-sectioned composite beams. And most recently,
Rao and Chan [6] expanded the work to consider
laminated tapered tubes. Ascione et al. [7] presented a
method that formulates one-dimensional kinematical
model that is able to study the static behavior of fiber-
reinforced polymer thin-walled beams. It’s well
known that the statics of composite beam is strongly
influenced by shear deformability because of the low
values of the elastic shear module. Such a feature
cannot be analyzed by Vlasov’s theory, which assume
that the shear strains are negligible along the middle
line of the cross-section. Ferrero et al. [8] proposed
that the stress field in thin-walled composite beams
due to attwisting moment is not correctly modeled by
classical analytical theories, so numerical modelingis
essential. Therefore, they developed method with a
simple way of determining stress and stiffness in this
type of structures where the constrained warping
effect can be taken into account. They worked with
both open and closed cross sections. Also, to check
the validity of the method for structures made of
composite materials, a beam with thin, composite
walls were studied. Wu et al. [9] presented a
procedure for analyzing the mechanical behavior of
laminated thin-walled composite box beam under
torsional load without external restraint. Some
analyses have been formulated to analyzed composite
box beam with varying levels of assumptions [10-
13].Therefore, analysis of aerofoil wing under
varying loading condition is key to improve the
design and provide good agreement in results.
II .SIMULATION
The Monte Carlo Simulation method is the most
common and traditional method for a probabilistic
analysis. This method simulates how virtual
components behave the way they are built. Present
work uses FEM package ANSYS for analysis of
composite beam of hollow NACA0012 aerofoil
shape.FEM package of ANSYS is used. Element
selected for meshing the geometry of the specimen is
shell 181.Material properties of epoxy graphite are
entered. Geometry of model is drawn in ANSYS
software. Geometry is meshed by giving element size
5mm. Mapped type of meshing is used. Meshed
model of specimen is shown below in figure in 1.
RESEARCH ARTICLE OPEN ACCESS
2. Sachin M. Shinde et al. Int. Journal of Engineering Research and Application ww.ijera.com
Vol. 3, Issue 5, Sep-Oct 2013, pp.13-18
www.ijera.com 14 | P a g e
Fig.1Meshed model of wing with SHELL 181
elements (zoomed cross section in box)
Meshed model contains 3549 number of
nodesand 3360 number of elements. The mesh size is
reasonably small to obtain fairly accurate results.
Fig.2 Meshed geometry with boundary conditions
Figure 2 shows model with applied loads and
boundary conditions.
Table 1. Random Input Variable Specifications
No. Name Type Lower limit Upper Limit
1 CHL UNIF 20.000 mm 100.00 mm
2 EXX UNIF 1×1005
N/mm2
2×1005
N/mm2
3 TIME UNIF 0.10000 Sec. 2.0000 Sec.
4 THETA UNIF 10.000 Deg. 90.000 Deg.
5 L UNIF 1000.0 mm 3000.0 mm
6 I UNIF 10.000 mm4
30.000 mm4
7 F UNIF 1 N 50 N
CHL,Exx,THETA,L,I and D indicate chord length ,
elastic modulus of epoxy graphite, ply angle of
aerofoil section, length , moment of inertia and force
respectively. These design parameters were varied by
usign uniform distribution.Maximum bending stress
in composite aerofoil beam is selected as response
parameter. Properties of epoxy graphite are
entered.All degrees of freedom are made zero at one
end of specimen while othe end is subjected to
displacement.Range of displacement is selected in
such a way that excessive distortion of the elements
can be avoided.Loading conditions are varied. So, full
Transient analysis of large dislacement type is
executed in 4 steps.Each step is incremented by
1step.One simulation loop of transient analysis has
been defined.It is executed 1000 times by varing
design parameters randomly within defined
range.Scatter plot of maximum bending strees has
been obtained at different combinations of selected
parameters.Simillarly,Optimization of selected design
parameters has been carried out inorder to reduce
shape of composite aerofoil beam. Random optimi-
zation has been carried out.1000 feasible sets are
obtained and the best set is seleted to reduce bending
stress.
III .RESULTS AND DISCUSSION
Figure 3 shows bending stress distribution in
composite aerofoil beam. Scattered plot is obtained at
4th
step of transient analysis. Maximum value of
bending stress is 20.609 N/mm2
and it is observed in
the region at the end of beam. One loop of simulation
is validated from results in literature.
Table2 Comparison of Literature and ANSYS
results
Aerofoil
wing
Bending stress (N/mm2
)
Literature Current
study
% Error
18.93 20.609 11%
Fig.3 Contour plot of Bending stress distribution
Input variables were randomly varied with respect to
output parameter bending stress. Scatter plots for the
bending stress as a function of the most important
random input variables are discussed as below.
3. Sachin M. Shinde et al. Int. Journal of Engineering Research and Application ww.ijera.com
Vol. 3, Issue 5, Sep-Oct 2013, pp.13-18
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Fig.4Scattered plot of bending stress vs. Aerofoil
ply angle.
In figure 4, BS indicates probable value of bending
stress with respect to aerofoil ply angle THETA in
degree. Scattered plot shows uncertainty in bending
stress. Polynomial distribution of C14 powers is
indicated by red colored line. As degree of
polynomial distribution is high, there is more
uncertainty in bending stress It is observed that
bending stress increased when ply angle THEA is
within the range 16 deg. to 32 deg.Bending stress was
reduced when THEA was within the range 8 deg. to
16 deg. It is observed that aerofoil ply angle is
significant cause of uncertainty in bending stress
because polynomial degree is more as compared to
other design parameters.
Fig.5 Scattered plot of Bending stress vs. Chord
length of Aerofoil section.
It is obtained after 1000 samples (tests). Output
parameter with combination of input parameters is
plotted. Higher order Polynomial of 13 degree is used
to plot scattering. It is observed that there is more
scatter of bending stress from polynomial line within
the thickness range 64 mm -96 mm. BS = 5500
N/mm2
which has rank 3 out of 1000 samples. The
confidence bounds are evaluated with a confidence
level of 95.000%. Figure 5 shows bending stress
N/mm2 vs. chord length of aerofoil section in mm.
C0 to C13 indicates degree of polynomial. As degree
of polynomial distribution is 13, there is more
uncertainty in bending stress. As compared to ply
angle THETA, uncertainty is less because degree of
polynomial is less by one. Linear correlation
coefficient between bending stress and chord length
is 0.0254.Value of bending stress is obtained at
different values of chord length. Value of bending
stress at 96 mm chord length is around 1000 N/mm2.
Particularly, above relationship between chord length
and bending stress is obtained at varying loading
conditions. There is considerable bending when chord
length is randomly varied.It can be said that obtained
bending stress is dynamic bending strength. At the
same time, bending stress is obtained at different
combinations of geometrical and material parameters.
At the chord length 97 mm, bending stress is 976.98
N/mm2. Figure 6 shows bending stress distribution of
aerofoil composite beam. Elastic modulus value is
randomly varied within range1×1005
N/mm2
to
2×1005
N/mm2 .
Scattered plot is obtained at 4th
step of
transient analysis. Maximum value of bending stress
is 965.76 N/mm2.
Rank order co-relation coefficient is
0.0006 and linear co-relation coefficient is 0.0007. It
is observed that there is less uncertainty because
maximum order of polynomial distribution of
bending stress is of 5. As compared to chord length
and ply angle THETA, random variation in elastic
modulus does not cause uncertainty in bending stress.
Fig.6 Scattered plot of Bending stress vs. Elastic
modulus
Figure 7 shows bending stress distribution of aerofoil
composite beam with respect to beam length. Beam
length value is randomly varied within range 1000
mm to 3000 mm. scattered plot is obtained at 4th
step
of transient analysis. Maximum value of bending
4. Sachin M. Shinde et al. Int. Journal of Engineering Research and Application ww.ijera.com
Vol. 3, Issue 5, Sep-Oct 2013, pp.13-18
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Fig.7 Scattered plot of Bending stress vs. Beam
length
Stress is 900.76 N/mm2.
Rank order co-relation
coefficient is 0.0134 and linear co-relation coefficient
is 0.0135. It is observed that there is less uncertainty
as compared to chord length and ply angle THETA.
Because maximum order of polynomial distribution
of bending stress is of C 7.Nature of trend line shows
that bending stress value is decreased after 2600mm
beam length and it was approximately constant when
beam length was 1800 mm to 2400 mm. Also rank
order coefficient value is less as compared to chord
length and ply angle THETA.
Fig.8 Scattered plot of Bending stress vs. Moment
of inertia
Figure 8 shows bending stress distribution of aerofoil
composite beam with respect to moment of inertia.
Moment of inertia value is randomly varied within
range 104
mm to 304
mm. scattered plot is obtained at
4th
step of transient analysis. Maximum value of
bending stress is 893.73 N/mm2
.Rank order co-
relation coefficient linear co-relation coefficients are
same i.e. 0.0292. It is observed that there is more
uncertainty as compared to chord length and ply
angle THETA,because maximum order of polynomial
distribution of bending stress is of C14. Also value of
above coefficients is less as compared to CHL and
THETA. Nature of trend line shows that bending
stress value is increased within range 10 to 14 mm4
moment of inertia.
After Monte Carlo simulation, results of optimization
are discussed as below. Objective function was
bending stress and design variables were same as that
of Monte Carlo simulation.
Table 3 Design variables for random optimization
of Aerofoilcomposite structure
Design
Parameters
Upper Limit Lower Limit
F 5 N 15 N
L 1000 mm 3000 mm
I 10 mm4
30 mm4
THETA 10 degree 90 degree
CHL 20 mm 100 mm
EXX 1002×1003
N/mm2
2002×1003
N/mm2
Objective function= BS (Bending stress) N/mm2
1000 feasible sets of optimizations have been
obtained and best set is proposed. Following figures
show feasible of values of design variables with
respect to objective function.
Fig.9 Feasible values of THETA vs. Bending
stress
5. Sachin M. Shinde et al. Int. Journal of Engineering Research and Application ww.ijera.com
Vol. 3, Issue 5, Sep-Oct 2013, pp.13-18
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Fig.10 Feasible values of Chord length vs. Bending
stress
Fig.11 Feasible values of Moment of inertia vs.
Bending stress
Fig.12 Feasible values of Beam length vs. Bending
stress
Fig.13 Feasible values of Elastic modulus vs.
bending stress
Table 4 shows best set among 1000 sets of feasible
value of design variable of optimized design variables
and reduced value of bending stress.
Table 4 Best set of randomoptimization
SET 742 (BEST OFFEASIBLE SETS)
Design
Variables
F 5.01 N
L 1592 mm
R 73.196 mm
THETA 86.115 Degree
EXX 122.85×1003
N/mm2
I 19.59 mm4
CHL 81.79 mm
Objective
Function
BENDINGSTRESS 180.58 N/mm2
IV CONCLUSION
The influence of the design parameters on
bending stress under variable loading condition is
studied.The conclusions obtained are summarised as
follows.
-It is found that there is significant uncertainty in
bending stress when chord length and aerofoil ply
angle are randomly varied
-Co-relation coefficients and rank order coefficients
of selected parameters are obtained to know the
relationship between bending stress and design
variables.
-In Monte Carlo simulation, it was observed that
probable value of bending stress was to 1131.79
N/mm2
. Bending stress value is reduced to 180.58
N/mm2
after random optimization.
-Best set of design variables has been proposed when
aerofoil wing is under varying loading condition.
6. Sachin M. Shinde et al. Int. Journal of Engineering Research and Application ww.ijera.com
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