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Conference Paper/Proceeding/Abstract 744 views

A new method for predicting fatigue crack growth rates using Abaqus

Will Harrison Orcid Logo, W.J. Evans

Abaqus UK Regional Users Meeting

Swansea University Author: Will Harrison Orcid Logo

Abstract

The aim of this project was to accurately predict fatigue crack growth rates using only data obtained from strain controlled tests. Mode 1 crack growth was simulated by a series of static Abaqus analyses with the crack growth rate calculated by dividing the increment of crack movement by the life be...

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Published in: Abaqus UK Regional Users Meeting
Published: 2008
URI: https://cronfa.swan.ac.uk/Record/cronfa29847
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spelling 2016-09-08T21:47:40.3843572 v2 29847 2016-09-08 A new method for predicting fatigue crack growth rates using Abaqus dae59f76fa4f63123aa028abfcd2b07a 0000-0002-0380-7075 Will Harrison Will Harrison true false 2016-09-08 MECH The aim of this project was to accurately predict fatigue crack growth rates using only data obtained from strain controlled tests. Mode 1 crack growth was simulated by a series of static Abaqus analyses with the crack growth rate calculated by dividing the increment of crack movement by the life between each analysis. The Abaqus Scripting Interface was used to draw the crack dimensions for each analysis and also to extract the relevant stress and strain data from output database file (.odb). The stress and strain values were then used to calculate the fatigue damage at each integration point, and hence the life between increments, based on the Walker life relationship.This paper outlines the methods used in developing the model. A description of Chaboche’s non-linear isotropic/kinematic hardening model is given along with a description of the Walker strain and how it is used to predict plane specimen fatigue lives. The Walker method is then used to predict the initiation lives of double-edge notched (DEN) specimens with results consistent with experimental data. The paper then shows how this method is extended to predicting the lives of nodes ahead of an advancing fatigue crack with the model showing a good correlation between predicted crack growth rates and those obtained experimentally. A close examination of the stress field around the crack tip was made and the importance of the monotonic and cyclic plastic zone sizes was investigated. Conference Paper/Proceeding/Abstract Abaqus UK Regional Users Meeting 31 12 2008 2008-12-31 COLLEGE NANME Mechanical Engineering COLLEGE CODE MECH Swansea University 2016-09-08T21:47:40.3843572 2016-09-08T21:28:08.8039143 College of Engineering Engineering Will Harrison 0000-0002-0380-7075 1 W.J. Evans 2
title A new method for predicting fatigue crack growth rates using Abaqus
spellingShingle A new method for predicting fatigue crack growth rates using Abaqus
Will Harrison
title_short A new method for predicting fatigue crack growth rates using Abaqus
title_full A new method for predicting fatigue crack growth rates using Abaqus
title_fullStr A new method for predicting fatigue crack growth rates using Abaqus
title_full_unstemmed A new method for predicting fatigue crack growth rates using Abaqus
title_sort A new method for predicting fatigue crack growth rates using Abaqus
author_id_str_mv dae59f76fa4f63123aa028abfcd2b07a
author_id_fullname_str_mv dae59f76fa4f63123aa028abfcd2b07a_***_Will Harrison
author Will Harrison
author2 Will Harrison
W.J. Evans
format Conference Paper/Proceeding/Abstract
container_title Abaqus UK Regional Users Meeting
publishDate 2008
institution Swansea University
college_str College of Engineering
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hierarchy_top_id collegeofengineering
hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
document_store_str 0
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description The aim of this project was to accurately predict fatigue crack growth rates using only data obtained from strain controlled tests. Mode 1 crack growth was simulated by a series of static Abaqus analyses with the crack growth rate calculated by dividing the increment of crack movement by the life between each analysis. The Abaqus Scripting Interface was used to draw the crack dimensions for each analysis and also to extract the relevant stress and strain data from output database file (.odb). The stress and strain values were then used to calculate the fatigue damage at each integration point, and hence the life between increments, based on the Walker life relationship.This paper outlines the methods used in developing the model. A description of Chaboche’s non-linear isotropic/kinematic hardening model is given along with a description of the Walker strain and how it is used to predict plane specimen fatigue lives. The Walker method is then used to predict the initiation lives of double-edge notched (DEN) specimens with results consistent with experimental data. The paper then shows how this method is extended to predicting the lives of nodes ahead of an advancing fatigue crack with the model showing a good correlation between predicted crack growth rates and those obtained experimentally. A close examination of the stress field around the crack tip was made and the importance of the monotonic and cyclic plastic zone sizes was investigated.
published_date 2008-12-31T03:41:29Z
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score 10.9201975