This document discusses fatigue life estimation of machine components. It begins with an introduction to fatigue failure, which occurs when fluctuating stresses cause cracks or fractures over many load cycles, even when maximum stresses are below ultimate strength. It then describes three main approaches to estimating fatigue life: stress-life, strain-life, and fracture mechanics. The majority of the document focuses on applying the stress-life approach using a stress-strain diagram to determine the number of cycles before failure based on applied stresses. It provides equations for calculating alternating and mean stresses under different loading types and for determining an equivalent stress under combined loading. The document concludes by outlining the procedural steps to use these methods and equations to estimate the fatigue life of a machine component.
Diseno en ingenieria mecanica de Shigley - 8th ---HDes
descarga el contenido completo de aqui http://paralafakyoumecanismos.blogspot.com.ar/2014/08/libro-para-mecanismos-y-elementos-de.html
Diseno en ingenieria mecanica de Shigley - 8th ---HDes
descarga el contenido completo de aqui http://paralafakyoumecanismos.blogspot.com.ar/2014/08/libro-para-mecanismos-y-elementos-de.html
Hertz Contact Stress Analysis and Validation Using Finite Element AnalysisPrabhakar Purushothaman
In general machines are designed with a set of elements to reduce cost, ease of assembly and manufacturability
etc. One also needs to address stress issues at the contact regions between any two elements, stress is induced when a load is applied to two elastic solids in contact. If not considered and addressed adequately serious flaws can occur within the mechanical design and the end product may fail to qualify. Stresses formed by the contact of two radii can cause extremely high stresses, the application and evaluation of Hertzian contact stress equations can estimate maximum stresses produced
and ways to mitigate can be sought. Hertz developed a theory to calculate the contact area and pressure between the two
surfaces and predict the resulting compression and stress induced in the objects. The roller bearing assembly and spur gear pair assembly is an example were the assembly undergoes fatigue failure due to contact stresses. This paper discusses the hertz contact theory validation using finite element Analysis.
Reliability Analysis of the Sectional Beams Due To Distribution of Shearing S...researchinventy
This paper shows the results of the Reliability Analysis of the sectional beams due to distribution of Shear Stress. It is assumed that the load was uniformly distributed over the beam. It is discussed that the distribution of shear stress over the beam. It is discussed that the average shears stress and maximum shear stress across the section of the beam for Weibull distribution. The reliability analysis of distribution of shearing stresses over sectional beams is performed. Also it is derived that the hazard functions for these types of beams. Reliability comparison has also been done for the sectional beams. It is observed that the reliability of the beam decreased when the width (b) of the beam decreases, and the load (F) is high. The reliability of the beam is increased when the height (h) of the triangular section increases , diameter(d) of the circular beam is increased and parameter 푘 decreasses
The determination of the stress distribution around Pin-Loaded Holes in Mechanically Fastened Joints is presented to the Engineering Department, University of Technology - Jamaica
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.
Measuring Robustness on Generalized Gaussian DistributionIJERA Editor
Different from previous work that measured robustness its own distribution, measuring robustness with a robust
estimator on a generalized Gaussian distribution is introduced here. In detail, an unbiased Maximum Likelihood
(ML) variance estimator and a robust variance estimator of the Gaussian distribution with a given censoring
value are applied to the generalized Gaussian distribution that represents Gaussian, Laplace, and Cauchy
distributions; then, Mean Square Error (MSE) is calculated to measure robustness. Afterward, how robustness
changes is shown because the actual distribution varies over the generalized Gaussian distribution. The results
indicate that measuring the MSE of the system can be used to point out how robust the system is when the
system distribution changes.
Application of CAD and SLA Method in Dental ProsthesisIDES Editor
Placement of dental implants requires precise
planning that accounts for anatomic limitations and
restorative goals. Diagnosis can be made with the assistance
of computerized tomographic scanning, but transfer of
planning to the surgical field is limited. Precise implant
placement no longer relies upon so called mental-navigation
but rather can be computer guided, based on a three
dimensional prosthetically directed plan. Recently, novel CAD/
CAM techniques such as stereolithographic rapid prototyping
have been developed to build surgical guides in an attempt to
improve precision of implant placement. The purpose of this
paper is to discuss the use of scanning equipments to transfer
clinically relevant prosthetic information which can be used
for fabrication of stereolithographic medical models and
surgical guides. The proposed method provides solid evidence
that computer-aided design and manufacturing technologies
may become a new avenue for custom-made dental implants
design, analysis, and production in the 21st century.
Hertz Contact Stress Analysis and Validation Using Finite Element AnalysisPrabhakar Purushothaman
In general machines are designed with a set of elements to reduce cost, ease of assembly and manufacturability
etc. One also needs to address stress issues at the contact regions between any two elements, stress is induced when a load is applied to two elastic solids in contact. If not considered and addressed adequately serious flaws can occur within the mechanical design and the end product may fail to qualify. Stresses formed by the contact of two radii can cause extremely high stresses, the application and evaluation of Hertzian contact stress equations can estimate maximum stresses produced
and ways to mitigate can be sought. Hertz developed a theory to calculate the contact area and pressure between the two
surfaces and predict the resulting compression and stress induced in the objects. The roller bearing assembly and spur gear pair assembly is an example were the assembly undergoes fatigue failure due to contact stresses. This paper discusses the hertz contact theory validation using finite element Analysis.
Reliability Analysis of the Sectional Beams Due To Distribution of Shearing S...researchinventy
This paper shows the results of the Reliability Analysis of the sectional beams due to distribution of Shear Stress. It is assumed that the load was uniformly distributed over the beam. It is discussed that the distribution of shear stress over the beam. It is discussed that the average shears stress and maximum shear stress across the section of the beam for Weibull distribution. The reliability analysis of distribution of shearing stresses over sectional beams is performed. Also it is derived that the hazard functions for these types of beams. Reliability comparison has also been done for the sectional beams. It is observed that the reliability of the beam decreased when the width (b) of the beam decreases, and the load (F) is high. The reliability of the beam is increased when the height (h) of the triangular section increases , diameter(d) of the circular beam is increased and parameter 푘 decreasses
The determination of the stress distribution around Pin-Loaded Holes in Mechanically Fastened Joints is presented to the Engineering Department, University of Technology - Jamaica
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.
Measuring Robustness on Generalized Gaussian DistributionIJERA Editor
Different from previous work that measured robustness its own distribution, measuring robustness with a robust
estimator on a generalized Gaussian distribution is introduced here. In detail, an unbiased Maximum Likelihood
(ML) variance estimator and a robust variance estimator of the Gaussian distribution with a given censoring
value are applied to the generalized Gaussian distribution that represents Gaussian, Laplace, and Cauchy
distributions; then, Mean Square Error (MSE) is calculated to measure robustness. Afterward, how robustness
changes is shown because the actual distribution varies over the generalized Gaussian distribution. The results
indicate that measuring the MSE of the system can be used to point out how robust the system is when the
system distribution changes.
Application of CAD and SLA Method in Dental ProsthesisIDES Editor
Placement of dental implants requires precise
planning that accounts for anatomic limitations and
restorative goals. Diagnosis can be made with the assistance
of computerized tomographic scanning, but transfer of
planning to the surgical field is limited. Precise implant
placement no longer relies upon so called mental-navigation
but rather can be computer guided, based on a three
dimensional prosthetically directed plan. Recently, novel CAD/
CAM techniques such as stereolithographic rapid prototyping
have been developed to build surgical guides in an attempt to
improve precision of implant placement. The purpose of this
paper is to discuss the use of scanning equipments to transfer
clinically relevant prosthetic information which can be used
for fabrication of stereolithographic medical models and
surgical guides. The proposed method provides solid evidence
that computer-aided design and manufacturing technologies
may become a new avenue for custom-made dental implants
design, analysis, and production in the 21st century.
Stress Analysis of Chain Links in Different Operating Conditionsinventionjournals
The work covers the stress analysis in a 3D model of chain link analitically and numerically, and based on a real model, experimental examination was carried out. First, the cases when the links are vertical to each other and their tensile load were considered. The analysis was done in both work and experimental conditions and also the tensile load just before the chain broke. Second, the position in which the links are rotated for the calculated maximum angle. Experimental analysis of the high resistance chain (high hardness), insignia stress 14x50 G80 E5 was carried out on an universal testing mashine and the results are used for verification of numerical model.
OPTIMIZATION AND FATIGUE ANALYSISOF A CRANE HOOK USING FINITE ELEMENT METHODijmech
Stress analysis plays an important role in the design of structures like crane hook under loading conditions.
Crane hook is a reliable lifting component being used in industries. Structure failure of crane hook occurs
because of the stress induced due to repetitive loading and unloading conditions. In this study, solid
modeling of crane hook having trapezoidal cross-section referring to one of its existing design is done
using SOLIDWORKS. Further, analyses are carried out in ANSYS Workbench and nCode DesignLife. The
lengths of two parallel sides of the cross-section of crane hook are varied and different candidates are
obtained for loading capacity of 30 ton on the basis of Mass, total Displacement and Von-Mises stress.This
is done to reduce weight and balance economy. Further, out of these candidates, best candidates are
considered and fatigue analysis is performed on these candidates.
Effect of V Notch Shape on Fatigue Life in Steel Beam Made of High Carbon St...IJMER
The present work includes study effect of V notch shape with various angle orientation and
depths on fatigue life behavior in steel beam made of High Carbon Steel alloy AISI 1078 which has a wide
application in industry. Fatigue life of notched specimens is calculated using the fatigue life obtained from
the experiments for smooth specimens (reference) and by use Numerical method (FEA).The fatigue
experiments were carried out at room temperature, applying a fully reversed cyclic load with the
frequency of 50 Hz and mean stress equal to zero (R= -1), on a cantilever rotating-bending fatigue testing
machine. The stress ratio was kept constant throughout the experiment. Different instruments have been
used in this investigation like Chemical composition analyzer , Tensile universal testing machine
,Hardness tester , Fatigue testing machine and Scanning Electron Microscope (SEM).The results show
that there is acceptable error between experimental and numerical works
Numerical modeling of the welding defect influence on fatigue life of the wel...inventy
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Experimental and numerical analysis of elasto-plastic behaviour of notched sp...IJERA Editor
The objective of the work was to estimate the elasto-plastic stress and strain behaviour at the root of the notch of
an Al 6061 plate undergoing tensile and compressive cyclic loading by both experimental and numerical
methods. This attempt to measured initial elasto-plastic stresses experimentally then verified by numerically.
The various Kt values such as 2, 4 and 6 specimens were subjected to tensile test using a computerised universal
testing machine. Numerical approach associated with body discretization and developed finite element model
with sufficient degree of freedom to analyses elasto-plastic analysis of notched specimen. Experimental results
show that analysis of three Kt notched specimens had similar behaviour of elasto-plastic behaviour but different
magnitude. The experimental results compare well with the numerical results which are obtained during finite
element analysis of notched specimens.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
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.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
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.
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Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
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.