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Incorporating the Wilshire equations for time to failure and the minimum creep rate into a continuum damage mechanics for the creep strain of Waspaloy

Mark Evans Orcid Logo

Materials at High Temperatures, Volume: 39, Issue: 2, Pages: 133 - 148

Swansea University Author: Mark Evans Orcid Logo

  • Accepted Manuscript under embargo until: 12th January 2023

Abstract

In this paper, a new constitutive model is presented that combines the Wilshire equations with a modified Kachanov-Rabotnov continuum damage mechanics (CDM) to enable the prediction of uniaxial creep curves that contain both a primary and tertiary stage. Another advantage of this approach is that th...

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Published in: Materials at High Temperatures
ISSN: 0960-3409 1878-6413
Published: Informa UK Limited 2022
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa59161
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spelling 2022-03-14T11:28:23.7512548 v2 59161 2022-01-12 Incorporating the Wilshire equations for time to failure and the minimum creep rate into a continuum damage mechanics for the creep strain of Waspaloy 7720f04c308cf7a1c32312058780d20c 0000-0003-2056-2396 Mark Evans Mark Evans true false 2022-01-12 MTLS In this paper, a new constitutive model is presented that combines the Wilshire equations with a modified Kachanov-Rabotnov continuum damage mechanics (CDM) to enable the prediction of uniaxial creep curves that contain both a primary and tertiary stage. Another advantage of this approach is that the Wilshire equations have been shown to accurately extrapolate the operational failure times and minimum creep rates from very short- term tests. This approach also removes the need to estimate the Wilshire time to strain equation at numerous different strains. A simple but multi-step procedure is also introduced for estimating the unknown parameters of this model. When applied to Waspaloy data, the model was shown to represent the shape of the experimental creep curves reasonably well especially at low and high strains) and provides reasonable creep curve predictions – with percentages errors averaging around 4-5%. Journal Article Materials at High Temperatures 39 2 133 148 Informa UK Limited 0960-3409 1878-6413 Creep curves, Wilshire equations, Constitutive models 4 3 2022 2022-03-04 10.1080/09603409.2021.2024418 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2022-03-14T11:28:23.7512548 2022-01-12T12:03:59.5399456 College of Engineering Engineering Mark Evans 0000-0003-2056-2396 1 Under embargo Under embargo 2022-01-12T12:07:00.1347715 Output 1167899 application/pdf Accepted Manuscript true 2023-01-12T00:00:00.0000000 Released under the terms of a CC-BY-NC license. true eng https://creativecommons.org/licenses/by-nc/4.0/
title Incorporating the Wilshire equations for time to failure and the minimum creep rate into a continuum damage mechanics for the creep strain of Waspaloy
spellingShingle Incorporating the Wilshire equations for time to failure and the minimum creep rate into a continuum damage mechanics for the creep strain of Waspaloy
Mark Evans
title_short Incorporating the Wilshire equations for time to failure and the minimum creep rate into a continuum damage mechanics for the creep strain of Waspaloy
title_full Incorporating the Wilshire equations for time to failure and the minimum creep rate into a continuum damage mechanics for the creep strain of Waspaloy
title_fullStr Incorporating the Wilshire equations for time to failure and the minimum creep rate into a continuum damage mechanics for the creep strain of Waspaloy
title_full_unstemmed Incorporating the Wilshire equations for time to failure and the minimum creep rate into a continuum damage mechanics for the creep strain of Waspaloy
title_sort Incorporating the Wilshire equations for time to failure and the minimum creep rate into a continuum damage mechanics for the creep strain of Waspaloy
author_id_str_mv 7720f04c308cf7a1c32312058780d20c
author_id_fullname_str_mv 7720f04c308cf7a1c32312058780d20c_***_Mark Evans
author Mark Evans
author2 Mark Evans
format Journal article
container_title Materials at High Temperatures
container_volume 39
container_issue 2
container_start_page 133
publishDate 2022
institution Swansea University
issn 0960-3409
1878-6413
doi_str_mv 10.1080/09603409.2021.2024418
publisher Informa UK Limited
college_str College of Engineering
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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 In this paper, a new constitutive model is presented that combines the Wilshire equations with a modified Kachanov-Rabotnov continuum damage mechanics (CDM) to enable the prediction of uniaxial creep curves that contain both a primary and tertiary stage. Another advantage of this approach is that the Wilshire equations have been shown to accurately extrapolate the operational failure times and minimum creep rates from very short- term tests. This approach also removes the need to estimate the Wilshire time to strain equation at numerous different strains. A simple but multi-step procedure is also introduced for estimating the unknown parameters of this model. When applied to Waspaloy data, the model was shown to represent the shape of the experimental creep curves reasonably well especially at low and high strains) and provides reasonable creep curve predictions – with percentages errors averaging around 4-5%.
published_date 2022-03-04T04:16:15Z
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