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.
Autoclave is a closed vessel (Round or Cylindrical) in which processes occur under simultaneous application of high temperature and pressure. Autoclave molding technique is similar to vacuum bag and pressure bag molding method with some modifications. This method employs an autoclave to provide heat and pressure to the composite product during curing.
Maximum principal stress theory.
Maximum shear stress theory.
Maximum shear strain theory.
Maximum strain energy theory.
Maximum shear strain energy theory.
RTM is a low-pressure molding process, where a mixed resin and catalyst are injected into a closed mold containing a fiber pack or preform . when the resin has cured the mold can be opened and finished component removed.
Some basic defintions of the topics used in Strength of Materials subject. Pictorial presentation is more than details. Many examples are provided as well.
Autoclave is a closed vessel (Round or Cylindrical) in which processes occur under simultaneous application of high temperature and pressure. Autoclave molding technique is similar to vacuum bag and pressure bag molding method with some modifications. This method employs an autoclave to provide heat and pressure to the composite product during curing.
Maximum principal stress theory.
Maximum shear stress theory.
Maximum shear strain theory.
Maximum strain energy theory.
Maximum shear strain energy theory.
RTM is a low-pressure molding process, where a mixed resin and catalyst are injected into a closed mold containing a fiber pack or preform . when the resin has cured the mold can be opened and finished component removed.
Some basic defintions of the topics used in Strength of Materials subject. Pictorial presentation is more than details. Many examples are provided as well.
Every material has certain strength, expressed in terms of stress or strain, beyond which it
fractures or fails to carry the load. Failure Criterion: A criterion used to hypothesize the failure.
Failure Theory: A Theory behind a failure criterion.
Need of Failure Theories:
(a) To design structural components and calculate margin of safety.
(b) To guide in materials development.
(c) To determine weak and strong directions.
DESIGN AND ANALYSIS OF LEAF SPRING BY USING COMPOSITE MATERIAL FOR LIGHT VEHI...IAEME Publication
Reducing weight while increasing or maintaining strength of products is getting to be highly important research issue in this modern world. Composite materials are one of the material families which are attracting researchers and being solutions of such issue. In this paper we describe design and analysis of composite leaf spring. For this purpose, a rear leaf spring for MAHINDRA “MODEL-COMMANDER 650 DI” is considered.
Crash Analysis of Front under Run Protection Device using Finite Element Anal...IOSR Journals
Under-running of passenger vehicles is one of the important parameters to be considered during
design and development of truck chassis. Front Under-run Protection Device (FUPD) plays an important role
in avoiding under-running of vehicles from front side of a truck. An explicit finite element software Altair
Radio's is used in FUPD analysis for impact loading. The deformation of FUPD bar and plastic strains in
FUPD components are determined in the impact analysis for predicting failure of the system to meet the
compliance requirements as per IS 14812-2005. Additionally, failure analysis of the FUPD attachment points
with chassis is determined. Physical testing can be reduced significantly with this approach which ultimately
reduces the total cycle time as well as the cost involved in product development.
It is a near net shape process in which casting and forging is done in single step.
It is Referred by many names such as “squeeze casting” , “pressure infiltration”, “liquid metal forging”, “extrusion casting”, “liquid pressing'', “pressure crystallization”.
Simulation and Experimental Studies on Composite BeamsIJERA Editor
A composite beam a one dimensional structure or a rod all of them are sectional dimensions in which width and height are much smaller in comparison to the structure. In structural applications longer beams are more frequently used. In this work a composite beam is manufactured with glass and epoxy combination. And stress analysis is carried out using derived analytical expressions. This research work carried out will enable to determine the beam strength due to bending loads. The importance of fiber reinforcement in the manufacturing of the beam is studied in terms of bending strength of the beam. Mat lab codes are generated to implement analytical equations of the composite beam. The analytical results are validated by performing experiments on composite beams. In this investigation, two different composite beams have been tested and compared the experimental results with the analytical results.
“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.
Every material has certain strength, expressed in terms of stress or strain, beyond which it
fractures or fails to carry the load. Failure Criterion: A criterion used to hypothesize the failure.
Failure Theory: A Theory behind a failure criterion.
Need of Failure Theories:
(a) To design structural components and calculate margin of safety.
(b) To guide in materials development.
(c) To determine weak and strong directions.
DESIGN AND ANALYSIS OF LEAF SPRING BY USING COMPOSITE MATERIAL FOR LIGHT VEHI...IAEME Publication
Reducing weight while increasing or maintaining strength of products is getting to be highly important research issue in this modern world. Composite materials are one of the material families which are attracting researchers and being solutions of such issue. In this paper we describe design and analysis of composite leaf spring. For this purpose, a rear leaf spring for MAHINDRA “MODEL-COMMANDER 650 DI” is considered.
Crash Analysis of Front under Run Protection Device using Finite Element Anal...IOSR Journals
Under-running of passenger vehicles is one of the important parameters to be considered during
design and development of truck chassis. Front Under-run Protection Device (FUPD) plays an important role
in avoiding under-running of vehicles from front side of a truck. An explicit finite element software Altair
Radio's is used in FUPD analysis for impact loading. The deformation of FUPD bar and plastic strains in
FUPD components are determined in the impact analysis for predicting failure of the system to meet the
compliance requirements as per IS 14812-2005. Additionally, failure analysis of the FUPD attachment points
with chassis is determined. Physical testing can be reduced significantly with this approach which ultimately
reduces the total cycle time as well as the cost involved in product development.
It is a near net shape process in which casting and forging is done in single step.
It is Referred by many names such as “squeeze casting” , “pressure infiltration”, “liquid metal forging”, “extrusion casting”, “liquid pressing'', “pressure crystallization”.
Simulation and Experimental Studies on Composite BeamsIJERA Editor
A composite beam a one dimensional structure or a rod all of them are sectional dimensions in which width and height are much smaller in comparison to the structure. In structural applications longer beams are more frequently used. In this work a composite beam is manufactured with glass and epoxy combination. And stress analysis is carried out using derived analytical expressions. This research work carried out will enable to determine the beam strength due to bending loads. The importance of fiber reinforcement in the manufacturing of the beam is studied in terms of bending strength of the beam. Mat lab codes are generated to implement analytical equations of the composite beam. The analytical results are validated by performing experiments on composite beams. In this investigation, two different composite beams have been tested and compared the experimental results with the analytical results.
“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.
Analysis of Cross-ply Laminate composite under UD load based on CLPT by Ansys...IJERA Editor
In current study the strength of composite material configuration is obtained from the properties of constituent
laminate by using classical laminate plate theory. For the purpose of analysis various configurations of 2 layered
and 4 layered cross ply laminates are used. The material of laminate is supposed to be boron/epoxy having
orthotropic properties. The loading in current study is supposed to be of uniformly distributed load type. For the
analysis purpose software working on finite element analysis logics i.e. Ansys mechanical APDL is used. By the
help of Ansys mechanical APDL the deflection and stress intensity is found out. The effect of variation of
laminate layers is also studied in current study along with the effect of variation of stacking patterns. The current
study will also help to conclude which stacking pattern is best in 2 layered and 4 layered cross ply laminate.
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.
Prediction of Deflection and Stresses of Laminated Composite Plate with Arti...IJMER
A true understanding of their structural behaviour is required, such as the deflections, buckling loads
and modal characteristics, the through thickness distributions of stresses and strains, the large deflection
behaviour and, of extreme importance for obtaining strong, reliable multi-layered structures, the failure
characteristics. In the past, the structural behaviour of plates and shells using the finite element method has been
studied by a variety of approaches. Choudhary and Tungikaranalyzed the geometrically nonlinear behavior of
laminated composite plates using the finite element analysis.
Finite Element Analysis of Damping Performance of VEM Materials Using CLD Tec...IJERA Editor
Most engineering structures experiences vibrational motion, this unwanted vibrations can result in premature
structural failure. Many methods are developed which enhances capability of damping such as constrained layer
damping. Shear motion is produced in VEM due to constraining layer to resist unwanted vibrational energy.
This paper shows theeffect of varying the thickness of viscoelastic materials on damping performance of CLD
beam.The damping performance is measured in terms of modal loss factor.
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.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
RESULTS OF FINITE ELEMENT ANALYSIS FOR INTERLAMINAR FRACTURE REINFORCED THERM...msejjournal
The double cantilever beam (DCB) is widely used for fracture toughness testing and it has become popular
for opening-mode (mode I) delamination testing of laminated composites. Delamination is a crack that
forms between the adjacent plies of a composite laminate at the brittle polymer resin. This study was
conducted to emphasize the need for a better understanding of the DCB specimen of different fabric
reinforced systems (carbon fibers) with a thermoplastic matrix (EP, PEI), by using the extended finite
element method (X-FEM). It is well known that in fabric reinforced composites fracture mechanisms
include microcracking in front of the crack tip, fiber bridging and multiple cracking, and both contribute
considerably to the high interlaminar fracture toughness measured. That means, the interlaminar fracture
toughness of a composite is not controlled by a single material parameter, but is a result of a complex
interaction of resin, fiber and interface properties.
RESULTS OF FINITE ELEMENT ANALYSIS FOR INTERLAMINAR FRACTURE REINFORCED THERM...MSEJjournal1
The double cantilever beam (DCB) is widely used for fracture toughness testing and it has become popular
for opening-mode (mode I) delamination testing of laminated composites. Delamination is a crack that
forms between the adjacent plies of a composite laminate at the brittle polymer resin. This study was
conducted to emphasize the need for a better understanding of the DCB specimen of different fabric
reinforced systems (carbon fibers) with a thermoplastic matrix (EP, PEI), by using the extended finite
element method (X-FEM). It is well known that in fabric reinforced composites fracture mechanisms
include microcracking in front of the crack tip, fiber bridging and multiple cracking, and both contribute
considerably to the high interlaminar fracture toughness measured. That means, the interlaminar fracture
toughness of a composite is not controlled by a single material parameter, but is a result of a complex
interaction of resin, fiber and interface properties.
RESULTS OF FINITE ELEMENT ANALYSIS FOR INTERLAMINAR FRACTURE REINFORCED THERM...msejjournal
The double cantilever beam (DCB) is widely used for fracture toughness testing and it has become popular
for opening-mode (mode I) delamination testing of laminated composites. Delamination is a crack that
forms between the adjacent plies of a composite laminate at the brittle polymer resin. This study was
conducted to emphasize the need for a better understanding of the DCB specimen of different fabric
reinforced systems (carbon fibers) with a thermoplastic matrix (EP, PEI), by using the extended finite
element method (X-FEM). It is well known that in fabric reinforced composites fracture mechanisms
include microcracking in front of the crack tip, fiber bridging and multiple cracking, and both contribute
considerably to the high interlaminar fracture toughness measured. That means, the interlaminar fracture
toughness of a composite is not controlled by a single material parameter, but is a result of a complex
interaction of resin, fiber and interface properties.
RESULTS OF FINITE ELEMENT ANALYSIS FOR INTERLAMINAR FRACTURE REINFORCED THERM...msejjournal
The double cantilever beam (DCB) is widely used for fracture toughness testing and it has become popular
for opening-mode (mode I) delamination testing of laminated composites. Delamination is a crack that
forms between the adjacent plies of a composite laminate at the brittle polymer resin. This study was
conducted to emphasize the need for a better understanding of the DCB specimen of different fabric
reinforced systems (carbon fibers) with a thermoplastic matrix (EP, PEI), by using the extended finite
element method (X-FEM). It is well known that in fabric reinforced composites fracture mechanisms
include microcracking in front of the crack tip, fiber bridging and multiple cracking, and both contribute
considerably to the high interlaminar fracture toughness measured. That means, the interlaminar fracture
toughness of a composite is not controlled by a single material parameter, but is a result of a complex
interaction of resin, fiber and interface properties.
RESULTS OF FINITE ELEMENT ANALYSIS FOR INTERLAMINAR FRACTURE REINFORCED THERM...msejjournal
The double cantilever beam (DCB) is widely used for fracture toughness testing and it has become popular
for opening-mode (mode I) delamination testing of laminated composites. Delamination is a crack that
forms between the adjacent plies of a composite laminate at the brittle polymer resin. This study was
conducted to emphasize the need for a better understanding of the DCB specimen of different fabric
reinforced systems (carbon fibers) with a thermoplastic matrix (EP, PEI), by using the extended finite
element method (X-FEM). It is well known that in fabric reinforced composites fracture mechanisms
include microcracking in front of the crack tip, fiber bridging and multiple cracking, and both contribute
considerably to the high interlaminar fracture toughness measured. That means, the interlaminar fracture
toughness of a composite is not controlled by a single material parameter, but is a result of a complex
interaction of resin, fiber and interface properties.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)
Effect of lamination angle on maximum deflection of simply supported composite beam
1. A Seminar Report on
“Study of the Effect of Lamination angle on
maximum deflection of simply supported
composite beam”
Under the Guidance of
Mr Arnab Choudhary
(ASSISTANT PROFESSOR)
MECHANICAL ENGINEERING
DR. B C ROY ENGINEERING COLLEGE
DURGAPUR
2. Slide Plan
1. Composite material
2. Fibre matrix
3. Classification of laminates
4. Advantages
5. Applications
6. Literature Review
7. Problem Outline
8. Approach to the problem
9. Laminate Constitutive Equation
10. A B D Matrix
11. Beam Equation
12. Symmetric Beams
13. Deflection
14. Typical Properties of Matrices (SI System
of Units)
15. Result
16. Discussion Of Results
17. Conclusion
18. Future Work
19. Reference
3. Composite Material
Definition
A Composite material is a material system composed of two or more macro constituents that
differ in shape and chemical composition and which are insoluble in each other.
Made from two or more constituent materials
Materials having significantly different physical or chemical properties.
Produced material have different characteristics from the individual components.
4. Fibre and Matrix
Fibre reinforced composite materials consists of fibres of significant strength and
stiffness embedded in a matrix with distinct boundaries between them. Both fibres and
matrix maintain their physical and chemical identities, yet their combination performs a
function which cannot be done by each constituent acting singly.
Fibres convey structural stiffness and strength to GRP (glass reinforced plastic)
materials. The matrix transfers the load between the fibres and also supports them under
compression loading.
5. Classification of Laminates
Symmetric Laminates:
A laminate is called symmetric when the material, angle and thickness of the layers are
the same above and below the mid-plane.
Anti-symmetric Laminates:
A laminate is called anti-symmetric when the material and thickness of the plies are
same above and below the mid-plane but the orientation of the plies at same distance
above and below the mid-plane have opposite signs.
6. Advantages
Good inplane stiffness and strength.
Low density.
Relatively low cost.
Corrosion resistance.
Low coefficient of thermal expansion.
Relatively mature technology.
Excellent in-service experience.
Compared with metals, the principal advantages of
advanced composites in aerospace applications are their
superior specific strength and stiffness,
6
7. Applications
1. Marine field
2. Aircraft and Space
3. Automotive
4. Sporting goods
5. Medical Devices
6. Commercial applications
8. Literature Review
In an early study on composite by Barbero et al. focused on
ultimate bending strength of composite beams under bending. The
study compared the experimental and analytical solution and
found that glass fibre reinforced plastic (GFRP) beam attained
ultimate bending strength as the result of local buckling of the
compression in flange.
In another study on composite rectangular beams, Chandra and
Chopra presented a comparative study of experimental and
theoretical data to understand the static response on composite
rectangular beams.
9. Problem Outline
A simply supported laminated composite beam of length 0.2m
and width of 6mm made of glass epoxy material in considered for
study angle ply antisymmetric arrangement of the lamina are
considered. A uniform load of 400N/m is applied on the beam.
Maximum deflection of the beam is calculated for different
lamination angle. The main objective of the paper is to find out the
lamination angle at which minimum deflection is obtained & to final
out the effect at lamination angle on maximum at beam deflection.
10. Approach to the problem
A mathematical model is built up using classical laminated
beam theory (CBT).
To find out the maximum deflection of simply supported
beam subjected to uniformly distributed load (UDL) for
different material.
Maximum deflection is calculated for different laminated
angle by formulating a program in MATLAB software.
The study is intended to provide tools that ensure better
designing options for composite laminate.
11. Laminate Constitutive Equation
• Stress-Strain Relationship for 𝜃 Lamina
The stress-strain relationship for thin lamina in the matrix form along the global x-y axis is given as
𝜎𝑥
𝜎 𝑦
𝜏 𝑥𝑦
=
𝑄11 𝑄12 𝑄16
𝑄21 𝑄22 𝑄26
𝑄61 𝑄62 𝑄66
𝜀 𝑥
𝜀 𝑦
𝛾𝑥𝑦
• Constitutive Equation of Laminated Plate
The stresses in the 𝑘 𝑡ℎ
ply at a distance of 𝑍 𝑘from the reference plane in terms of strains and laminate
curvatures can be expressed as
𝜎𝑥
𝜎 𝑦
𝜏12 𝑘 𝑡ℎ
=
𝑄11 𝑄12 𝑄16
𝑄21 𝑄22 𝑄26
𝑄61 𝑄62 𝑄66 𝑘 𝑡ℎ
𝜀 𝑋
𝑂
𝜀 𝑌
𝑂
𝛾 𝑋𝑌
𝑂
+ 𝑍𝑥
𝐾 𝑋
𝐾𝑦
𝐾12
12. A B D Matrix
The total constitutive equation or load-deformation relations for the laminate is as follows
𝑁
𝑀
=
𝐴 𝐵
𝐵 𝐷
𝜀0
𝐾
Where
𝐴 = 𝑄 𝑘
ℎ 𝑘 − ℎ 𝑘−1
𝑛
𝑘=1
𝐵 =
1
2
𝑄 𝑘
𝑛
𝑘=1
ℎ 𝑘
2
− ℎ 𝑘−1
2
𝐷 =
1
3
𝑄 𝑘
(
𝑛
𝑘−1
ℎ 𝑘
3
− ℎ 𝑘−1
3
)
13. Beam Equation
The bending stress in an isotropic beam under an applied
bending moment, M , is given by,
σ =
𝑀𝑧
I
where
z= Distance from the centroid
I= Second moment of area
𝜎= Bending stress
M= Bending moment
14. Symmetric Beams
To keep the introduction simple, we will discuss beams that are symmetric
and have a rectangular cross-section.
Because the beam is symmetric, the loads and moments are decoupled
𝑀 𝑥
𝑀 𝑦
𝑀 𝑥𝑦
= 𝐷
𝐾𝑥
𝐾 𝑦
𝐾𝑥𝑦
or
𝐾𝑥
𝐾 𝑦
𝐾𝑥𝑦
= 𝐷 −1
𝑀 𝑥
𝑀 𝑦
𝑀 𝑥𝑦
Now, if bending is only taking place in the x direction then
𝑀 𝑌 = 0 , 𝑀 𝑥𝑦 = 0
That is
Kx = D11Mx
Ky = D12Mx
KXY = D16Mx
15. Deflection
To find the maximum deflection of the beam, 𝛿 we use the isotropic beam
formula:
𝑊𝑚𝑎𝑥 =
5𝑞𝐿4
384 𝐸 𝑥𝑥 𝐼 𝑦𝑦
Where,
q = Load Intensity (N/m)
L = Length of the beam (m)
𝛿 = Deflection of the beam
𝐸 𝑥 𝑥 =Effective bending modulus of beam
Iyy = second moment of area with respect to the x–y –plane
20. • Graph shows the effect of fibre lamination angle on transverse deflection of beam.
• It is observed that as the lamination angle increases from ± 0° to ± 90° transverse deflection
increases.
• Maximum deflection obtained at ±90° and minimum deflection obtained at ± 0°. Transverse
deflection is obtained for different combination of composites material.
• It is find out from the graph that G-C-C-G combination of composite material experience the
minimum transverse deflection as compared to other combination of composite material.
• Graphite has more strength than glass as well as modulus of elasticity of graphite is higher than
glass that makes graphite more strengthened and glass softer.
Discussion Of Results
21. Conclusion
It is concluding that the best arrangement of composite material is G-C-C-G. So it canbe
used for different practical application.
G-C-C-G arrangement facilitates reliable service as there is minimum transvers deflection
obtained among all of the arrangement.
An analytical method was developed for deflection analysis of a composite rectangular
beam.
A graph is plotted between Deflection & Lamination angle.
An analytical method is purposed to evaluatetransverse deflections of composite beam with
simply supported arrangement. MATLAB CODES are used to implement the analytical
expressions that are derived.
From the study it is concluded that as the lamination angle changes to ± 0° to ± 90°
transverse deflection increases.
Maximum transverse deflection is obtained at ± 90° and minimum transverse deflection
obtained at± 0°.
21
22. Future Work
Further calculation can be made for deflection with different types of beam such as
cantilever beam, overhanging bean, fixed beam, and different types of load condition
such as point load, uniformly varying loadetc.
By taking some different composites material deflection can be obtained.
Calculation to be made by considering some other parameters such as maximum stress
developed.
Maximum transverse deflection can also be obtained by using ANSYS software and
compared with result obtained from analytical method
23. References
Autar K. Kaw “Mechanics of Composite Materials”, Second
edition, 2006, pp. 431-445
J.N.Reddy “Mechanics of Laminated Composite Plates and Shells
Theory and Analysis”, Second Edition, 200, pp. 10-48
Barbero, E. J., Fu, S. H., and Raftoyiannis, I. “Ultimate bending
strength of composite beams.” Journal of Materials in Civil
Engineering Vol.3 No.4, 1991, pp. 292–306.
Chandra, R., and Chopra, I., “Experimental and theoretical
analysis of composites I-beams with elastic couplings”, AIAA
Journal Vol. 29 No.12, 1991, pp. 2197–2206.