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Application of the Theta projection method to creep modelling 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 create a creep model using Abaqus, based on the theta projection method. This method has been shown to accurately predict primary, secondary and tertiary creep behaviour for a range of engineering materials. A constitutive relationship based on the theta projection met...

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Published in: Abaqus UK Regional Users Meeting
Published: 2007
URI: https://cronfa.swan.ac.uk/Record/cronfa29848
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spelling 2016-09-08T21:53:19.1598666 v2 29848 2016-09-08 Application of the Theta projection method to creep modelling using Abaqus dae59f76fa4f63123aa028abfcd2b07a 0000-0002-0380-7075 Will Harrison Will Harrison true false 2016-09-08 MECH The aim of this project was to create a creep model using Abaqus, based on the theta projection method. This method has been shown to accurately predict primary, secondary and tertiary creep behaviour for a range of engineering materials. A constitutive relationship based on the theta projection method was already available, with creep behaviour evolving with the accumulation of state variables based on dislocation hardening, dislocation recovery and internal material damage. An Abaqus based user subroutine for this relationship was compiled which included creep rupture based on a Kachanov type failure process. The model was designed to integrate with a fatigue crack growth model to produce a coupled high temperature fatigue model to compare against experimental data as part of an EPSRC project undertaken within the Rolls Royce UTC at Swansea.The creep model was used to predict the creep behaviour of various tested specimens for the titanium alloy, Ti-6246. Specimen geometries included uniaxial, biaxial, round-circumferentially notched (RCN) and V-shaped circumferentially notched (VCN). Strain rate and creep life predictions were compared to experimental data where available with results showing a good correlation. Also, the stress relaxation around a fatigue crack tip was investigated along with the effect of continuum creep damage on the rate of the advancing fatigue crack. Predictions highlight the importance of the both maximum principle stress and shear stress on the mechanical processes at the crack tip. The model also quantified the increasing effect of creep damage in the later stages of fatigue crack propagation. Verification of this work is ongoing at Swansea University. Conference Paper/Proceeding/Abstract Abaqus UK Regional Users Meeting Creep, Creep Rupture, Damage, Titanium, Notches, Theta Projection Method, Low Cycle Fatigue, Crack Growth 31 12 2007 2007-12-31 COLLEGE NANME Mechanical Engineering COLLEGE CODE MECH Swansea University 2016-09-08T21:53:19.1598666 2016-09-08T21:41:16.7424629 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering Will Harrison 0000-0002-0380-7075 1 W.J. Evans 2
title Application of the Theta projection method to creep modelling using Abaqus
spellingShingle Application of the Theta projection method to creep modelling using Abaqus
Will Harrison
title_short Application of the Theta projection method to creep modelling using Abaqus
title_full Application of the Theta projection method to creep modelling using Abaqus
title_fullStr Application of the Theta projection method to creep modelling using Abaqus
title_full_unstemmed Application of the Theta projection method to creep modelling using Abaqus
title_sort Application of the Theta projection method to creep modelling 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 2007
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering
document_store_str 0
active_str 0
description The aim of this project was to create a creep model using Abaqus, based on the theta projection method. This method has been shown to accurately predict primary, secondary and tertiary creep behaviour for a range of engineering materials. A constitutive relationship based on the theta projection method was already available, with creep behaviour evolving with the accumulation of state variables based on dislocation hardening, dislocation recovery and internal material damage. An Abaqus based user subroutine for this relationship was compiled which included creep rupture based on a Kachanov type failure process. The model was designed to integrate with a fatigue crack growth model to produce a coupled high temperature fatigue model to compare against experimental data as part of an EPSRC project undertaken within the Rolls Royce UTC at Swansea.The creep model was used to predict the creep behaviour of various tested specimens for the titanium alloy, Ti-6246. Specimen geometries included uniaxial, biaxial, round-circumferentially notched (RCN) and V-shaped circumferentially notched (VCN). Strain rate and creep life predictions were compared to experimental data where available with results showing a good correlation. Also, the stress relaxation around a fatigue crack tip was investigated along with the effect of continuum creep damage on the rate of the advancing fatigue crack. Predictions highlight the importance of the both maximum principle stress and shear stress on the mechanical processes at the crack tip. The model also quantified the increasing effect of creep damage in the later stages of fatigue crack propagation. Verification of this work is ongoing at Swansea University.
published_date 2007-12-31T03:35:59Z
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score 10.927057