Finite Element Based Fatigue Calculations
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Finite Element Based Fatigue Calculations
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Author : N. W. M. Bishop
language : en
Publisher:
Release Date : 2000
Finite Element Based Fatigue Calculations written by N. W. M. Bishop and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Finite element method categories.
Metal Fatigue In Engineering Based On Finite Element Analysis Fea
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Author : Florian Mailander
language : en
Publisher:
Release Date : 2019-09-27
Metal Fatigue In Engineering Based On Finite Element Analysis Fea written by Florian Mailander and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-09-27 with categories.
In addition to lightweight design, the methods of fatigue strength are applied above all for economic reasons or for energy preservation. Components can thus be designed more precisely to the loads and operating time. With the least possible use of materials, components can thus be utilized to a greater extent, lift load reserves, and reduce costs. Increasingly, engineers in the fields of development, design, simulation or research, need this fatigue knowledge to design their components.To ensure quick and easy training, this book focuses onthe most important methods and limits itself to only the necessary mathematics. For an understandable placement of the contents, many illustrations are used. In addition, complicated facts are explained by practical examples. To strengthen the understanding of the theory, it is also supplemented by extensive practical exercises. Each chapter closes with a short summary.For an easy application of the methods you will find useful Excel toolsThat is why this book was created: - to focus on important methods on fatigue, - to analyze Simulation results, - to supplement the theoretical methods with material and calculation data, - to offer a quick introduction in the Finite Element Analysis- for easy understanding through various illustrations, - to provide convenient Excel tools for easy applicat
Finite Element Based Vibration Fatigue Analysis For A New Free Piston Engine Component
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Author :
language : en
Publisher:
Release Date : 2009
Finite Element Based Vibration Fatigue Analysis For A New Free Piston Engine Component written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Finite element method categories.
Development Of A Finite Element Based Nominal Stress Extraction Procedure For Fatigue Analysis Of Welded Structures
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Author : Alewyn Petrus Grove
language : en
Publisher:
Release Date : 2013
Development Of A Finite Element Based Nominal Stress Extraction Procedure For Fatigue Analysis Of Welded Structures written by Alewyn Petrus Grove and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
The implementation of finite element methods (FEM) for fatigue analysis of complex structures in industry are becoming an increasingly effective and accepted practice. In the case of large plate-like structures, such as Load Haul Dumper (LHD) equipment, constructional frames and supports in plants and heavy vehicle trailers to name but a few, modeling can take place by implementation of either two dimensional shell elements or three dimensional solid elements. It is, however, not clear which shell element modeling procedure is the most realistic. Solid elements are accepted to give the closest resemblance since the element itself is the closest to reality in terms of geometry and also due to the fact that it is a three dimensional element. Due to economical and practical considerations, however, shell elements are used in industry - especially in large, plate-like structures. Another primary source of uncertainty lies with the definition of nominal stress in complex structures and the correct determination and extraction thereof from finite element obtained stress distributions. This situation occurs as a consequence of the absence of clear and distinct guidelines in the nominal stress based fatigue design codes such as BS 7608:1993: ECCS 6: 1985 and IIW XIII-1965-03 on weld modeling and nominal stress extraction procedures in conjunction with FEM. Explicit guidelines for finite element modeling and fatigue relevant stress determination do exist in the IIW fatigue design recommendations on top of the nominal stress guidelines, but focus primarily on the implementation of the hot spot stress fatigue assessment procedures. This dissertation consequently entails the development of a nominal stress extraction procedure for fatigue design and analysis of plate-like structures, utilizing shell elements. Firstly, the integrity of shell elements as concerned with the accurate capturing of the stiffness properties and stress distribution in the vicinity of welds are investigated, with the aim of establishing a set of guidelines and recommendations for the correct meshing and modeling procedure of welds in plate-like structures. Secondly, an extensive numerical investigation into the stress concentration characteristics of various T-piece and stiffener configurations is performed, resulting in a nominal stress extraction procedure. The developed methodology is applied on a complex plate-like structure for verification purposes. The structure is modeled by means of a finite element model, compiled according to the meshing recommendations developed. The stress distribution due to static loading is investigated and compared with measured values. Furthermore, the stress response of the structure due to stochastic dynamic loading is investigated and also validated in terms of the suitability for assessment by static equivalent design criteria, in particular the Fatigue Equivalent Static Load (FESL) methodology. A nominal stress and hot spot stress fatigue life prediction under stochastic loading is made, based on measured stresses in conjunction with the developed stress extraction methodology and the IIW guidelines respectively. Furthermore the finite element stresses are implemented in conjunction with the FESL procedure to repeat the nominal stress and hot spot stress life predictions. The viability and integrity of the FESL methodology is also critically assessed. The actual fatigue life of the structure under the particular loading characteristics is then determined and compared to the predicted lives.
A New Finite Element Procedure For Fatigue Life Prediction And High Strain Rate Assessment Of Cold Worked Advanced High Strength Steel
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Author : Wasim Akram Tarar
language : en
Publisher:
Release Date : 2008
A New Finite Element Procedure For Fatigue Life Prediction And High Strain Rate Assessment Of Cold Worked Advanced High Strength Steel written by Wasim Akram Tarar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Finite element method categories.
Abstract: This dissertation presents a new finite element procedure for fatigue life prediction and high strain rate assessment of cold worked Advanced High Strength Steel (AHSS). The first part of this research is related to the development of a new finite element procedure from an energy-based fatigue life prediction framework previously developed for prediction of axial, bending and multi-axial fatigue life. The framework for the prediction of fatigue life via energy analysis consists of constitutive laws which correlate the cyclic energy to the amount of energy required to fracture a material. In this study, the energy expressions that construct the new constitutive laws are integrated into a minimum potential energy formulation to develop new finite elements for fatigue life prediction for structural components subjected to axial, bending and multi-axial cyclic loads. The comparison of finite element method (FEM) results to the existing experimental fatigue data verifies the new finite element method for fatigue life prediction. The final output of this finite element analysis is in the form of number of cycles to failure for each element. The performance of the fatigue finite element is demonstrated by the fatigue life predictions from Al 6061-T6 and Ti-6Al-4V. In addition to developing new fatigue finite elements, a new equivalent stress expression and a new finite element procedure for multiaxail fatigue life prediction are also proposed. The new procedure is applicable to biaxial as well as multiaxial fatigue applications. The second part of this research is related to the development of LSDYNA material model for vehicle crash simulation based on high strain rate assessment of cold worked AHSS. In order to simulate actual crash using software like LSDYNA, it is desirable to have accurate stress/strain data for materials. The material models available in the literature ignore the effect of cold working on the material and present data only for flat sheets. In this research, the cold worked AHSS with curved cross-section is tested at strain rates of 1000 (in/in)/s and the data is used to develop a corresponding LSDYNA material model for vehicle crash simulation.
Finite Element Based Fatigue Evaluation Of Cope Holes In Bridge Girders
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Author : Steffen P. Groesgen
language : en
Publisher:
Release Date : 1995
Finite Element Based Fatigue Evaluation Of Cope Holes In Bridge Girders written by Steffen P. Groesgen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Box girder bridges categories.
The Kansas Department of Transportation requested a study to examine the fatigue behavior of cope holes specifically to answer the question as to which AASHTO fatigue category governs cope holes. The goal of this project is to supplement the AASHTO Bridge Design Specification by providing experimental and analytical information for designers as to how to categorize cope holes in welded steel girders. The stress field in an idealized smooth cope hole, as well as a representative actual flame cut cope hole, was determined in an actual beam. The resulting stress field, as determined with experimental stress analysis techniques, revealed a serious stress concentration located near the top of the cope hole in the web. This stress field was confirmed in a comprehensive finite element study of a section of the beam assembly using both 2-D and 3-D analysis.
Metal Fatigue Analysis Handbook
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Author : Yung-Li Lee
language : en
Publisher: Elsevier
Release Date : 2011-10-06
Metal Fatigue Analysis Handbook written by Yung-Li Lee and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-10-06 with Technology & Engineering categories.
Understand why fatigue happens and how to model, simulate, design and test for it with this practical, industry-focused reference Written to bridge the technology gap between academia and industry, the Metal Fatigue Analysis Handbook presents state-of-the-art fatigue theories and technologies alongside more commonly used practices, with working examples included to provide an informative, practical, complete toolkit of fatigue analysis. Prepared by an expert team with extensive industrial, research and professorial experience, the book will help you to understand: Critical factors that cause and affect fatigue in the materials and structures relating to your work Load and stress analysis in addition to fatigue damage—the latter being the sole focus of many books on the topic How to design with fatigue in mind to meet durability requirements How to model, simulate and test with different materials in different fatigue scenarios The importance and limitations of different models for cost effective and efficient testing Whilst the book focuses on theories commonly used in the automotive industry, it is also an ideal resource for engineers and analysts in other disciplines such as aerospace engineering, civil engineering, offshore engineering, and industrial engineering. The only book on the market to address state-of-the-art technologies in load, stress and fatigue damage analyses and their application to engineering design for durability Intended to bridge the technology gap between academia and industry - written by an expert team with extensive industrial, research and professorial experience in fatigue analysis and testing An advanced mechanical engineering design handbook focused on the needs of professional engineers within automotive, aerospace and related industrial disciplines
Fatigue Analysis Of Welded Structures Using The Finite Element Method
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Author : Mustafa Ayg L
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2012-05
Fatigue Analysis Of Welded Structures Using The Finite Element Method written by Mustafa Ayg L and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-05 with categories.
Fatigue design and analysis of steel and composite bridges is generally based on the notion of the nominal stress using the classified S-N curves with corresponding fatigue classes for typical details. Such an approach can yield an unrealistic estimation of the load effects for structure components because of an ever increasing number of structural details and loading situations resulting in a limited number of possible treatable design cases. The advanced failure methods have been developed to enable an accurate estimation of the load effects for the fatigue strength of welded steel structures, in cases where the nominal stress is hard to estimate because of geometric and loading complexities or in cases where there is no classified detail that is suitable to be compared with. The overall objective of this study is to evaluate the applicability and reliability of the common fatigue life assessment methods using the finite element method. The failure methods considered are the nominal stress, hot spot stress and effective notch stress method. A number of frequently used bridge details have been evaluated for the purpose of comparing the equivalency between these methods.
Introduction To Finite Element Analysis
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Author : Barna Szabó
language : en
Publisher: John Wiley & Sons
Release Date : 2011-03-21
Introduction To Finite Element Analysis written by Barna Szabó and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-03-21 with Technology & Engineering categories.
When using numerical simulation to make a decision, how can its reliability be determined? What are the common pitfalls and mistakes when assessing the trustworthiness of computed information, and how can they be avoided? Whenever numerical simulation is employed in connection with engineering decision-making, there is an implied expectation of reliability: one cannot base decisions on computed information without believing that information is reliable enough to support those decisions. Using mathematical models to show the reliability of computer-generated information is an essential part of any modelling effort. Giving users of finite element analysis (FEA) software an introduction to verification and validation procedures, this book thoroughly covers the fundamentals of assuring reliability in numerical simulation. The renowned authors systematically guide readers through the basic theory and algorithmic structure of the finite element method, using helpful examples and exercises throughout. Delivers the tools needed to have a working knowledge of the finite element method Illustrates the concepts and procedures of verification and validation Explains the process of conceptualization supported by virtual experimentation Describes the convergence characteristics of the h-, p- and hp-methods Covers the hierarchic view of mathematical models and finite element spaces Uses examples and exercises which illustrate the techniques and procedures of quality assurance Ideal for mechanical and structural engineering students, practicing engineers and applied mathematicians Includes parameter-controlled examples of solved problems in a companion website (www.wiley.com/go/szabo)
Fatigue Analysis Of A Paper Airplane
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Author : Michael R. Urban Ph.D.
language : en
Publisher: Covenant Books, Inc.
Release Date : 2023-10-02
Fatigue Analysis Of A Paper Airplane written by Michael R. Urban Ph.D. and has been published by Covenant Books, Inc. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-10-02 with Technology & Engineering categories.
Accounting for fatigue loadings has been a concern ever since the widespread introduction of metallic materials into load-bearing components in the nineteenth century. Calculations were developed based on the analysis capabilities of their time incorporating all the latest technologies of their era. At the time, that technology was pencil-and-paper calculations. Today's calculations are computer-based. The widespread use of computing methods has greatly enhanced the analyst abilities for simulating internal stress and strain fields. Unfortunately, current fatigue analyses often force-fit current stress field calculations into fatigue analysis methods meant for nineteenth century stress calculation methods. It's never a good idea to force methods optimized for pre-computer calculations to work with computers. This text presents a more integrated approach to computer-based fatigue analysis methods. Like what was originally done, the latest technologies are applied rather than force-fitting computer computational capabilities into nineteenth-century techniques. Holistic approaches incorporating all knowledge have long been established as the most successful approach to problem-solving. Incorporating all knowledge with the most modern capabilities is the preferred approach. Holistic methods strive to reduce subjective inputs and replace them with consistent objective ones. This text aims to transition disjointed inefficient analyses into a unified computer-based holistic technique by introducing a fatigue analysis method specifically developed for computer simulations. Ultimately, for any method or theory to be valuable, it must be put into practice and prove itself. That entails leadership decision-making. Engineering design development activities will lead to final decisions. Information in a holistic approach must include the reliability of the information. How consistent are the predictions? Are the two types of potential scatter, analytic, and physical properly addressed? Is analytic scatter minimized while maintaining creativity? Is physical scatter totally understood? Effective program management requires knowledge on both types of scatter and, most importantly, the ability to realize the difference. A novel computer-based unified approach to fatigue methods is presented which incorporates a holistic approach for more accurate and consistent analyses, including the management and leadership of fatigue analysis projects, minimization of analytic scatter, management of physical scatter, and unification of methods that minimize subjective inputs often needed to bridge inconsistent techniques.