A New Finite Element Procedure for Fatigue Life Prediction and High Strain Rate Assessment of Cold Worked Advanced High Strength Steel

A New Finite Element Procedure for Fatigue Life Prediction and High Strain Rate Assessment of Cold Worked Advanced High Strength Steel

Bibliographic Details
Main Author: Tarar, Wasim Akram
Language:English
Published: The Ohio State University / OhioLINK 2008
Subjects:
Mechanical Engineering
Fatigue
Life Cycles
Finite Element Methods
Material Models
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=osu1204575243
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-osu12045752432021-08-03T05:53:19Z A New Finite Element Procedure for Fatigue Life Prediction and High Strain Rate Assessment of Cold Worked Advanced High Strength Steel Tarar, Wasim Akram Mechanical Engineering Fatigue Life Cycles Finite Element Methods Material Models 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. 2008-03-19 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1204575243 http://rave.ohiolink.edu/etdc/view?acc_num=osu1204575243 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Mechanical Engineering
Fatigue
Life Cycles
Finite Element Methods
Material Models
spellingShingle Mechanical Engineering
Fatigue
Life Cycles
Finite Element Methods
Material Models
Tarar, Wasim Akram
A New Finite Element Procedure for Fatigue Life Prediction and High Strain Rate Assessment of Cold Worked Advanced High Strength Steel
author Tarar, Wasim Akram
author_facet Tarar, Wasim Akram
author_sort Tarar, Wasim Akram
title A New Finite Element Procedure for Fatigue Life Prediction and High Strain Rate Assessment of Cold Worked Advanced High Strength Steel
title_short A New Finite Element Procedure for Fatigue Life Prediction and High Strain Rate Assessment of Cold Worked Advanced High Strength Steel
title_full A New Finite Element Procedure for Fatigue Life Prediction and High Strain Rate Assessment of Cold Worked Advanced High Strength Steel
title_fullStr A New Finite Element Procedure for Fatigue Life Prediction and High Strain Rate Assessment of Cold Worked Advanced High Strength Steel
title_full_unstemmed A New Finite Element Procedure for Fatigue Life Prediction and High Strain Rate Assessment of Cold Worked Advanced High Strength Steel
title_sort new finite element procedure for fatigue life prediction and high strain rate assessment of cold worked advanced high strength steel
publisher The Ohio State University / OhioLINK
publishDate 2008
url http://rave.ohiolink.edu/etdc/view?acc_num=osu1204575243
work_keys_str_mv AT tararwasimakram anewfiniteelementprocedureforfatiguelifepredictionandhighstrainrateassessmentofcoldworkedadvancedhighstrengthsteel
AT tararwasimakram newfiniteelementprocedureforfatiguelifepredictionandhighstrainrateassessmentofcoldworkedadvancedhighstrengthsteel
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