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The Relative Importance of Creep Hardening, Softening, and Damage in the Determination of Creep Failure Using a Monkman–Grant-Type Relation Derived Within the 4-θ Methodology

Mark Evans

Metallurgical and Materials Transactions A

Swansea University Author: Mark Evans

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DOI (Published version): 10.1007/s11661-025-07905-2

Abstract

An analysis of minimum creep rates vs. time to failure is a suggested approach to the evaluationof long-term creep rupture. But this requires constancy of this relation over all test conditions.This paper therefore used the 4-h methodology to study in more detail the role of creepmechanisms in deter...

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Published in: Metallurgical and Materials Transactions A
ISSN: 1073-5623 1543-1940
Published: Springer Science and Business Media LLC 2025
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URI: https://cronfa.swan.ac.uk/Record/cronfa69952
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spelling 2025-09-04T12:28:27.1919654 v2 69952 2025-07-14 The Relative Importance of Creep Hardening, Softening, and Damage in the Determination of Creep Failure Using a Monkman–Grant-Type Relation Derived Within the 4-θ Methodology 7720f04c308cf7a1c32312058780d20c Mark Evans Mark Evans true false 2025-07-14 An analysis of minimum creep rates vs. time to failure is a suggested approach to the evaluationof long-term creep rupture. But this requires constancy of this relation over all test conditions.This paper therefore used the 4-h methodology to study in more detail the role of creepmechanisms in determining the nature of this relationship and from this, the stability of therelationship. It was found that the Monkman–Grant constant depended negatively on the rateof damage accumulation, the initial strain rate, and the rate of hardening, but positively on thestrain at failure. It was also found that at 833 K and a high stress, h4 was the major determinantof failure times. But as the stress level fell, the parameters h3 and h1 become more important.The growing importance of h3 with decreasing stress implies a bigger role for damageaccumulation with decreasing stress (as ^W =1/h3). At the highest stress, the rate of softeningwas the biggest contributor to variations in failure time but with decreasing stress, damageaccumulation and hardening play a bigger role in determining the variation in failure times. Journal Article Metallurgical and Materials Transactions A 0 Springer Science and Business Media LLC 1073-5623 1543-1940 25 7 2025 2025-07-25 10.1007/s11661-025-07905-2 COLLEGE NANME COLLEGE CODE Swansea University SU Library paid the OA fee (TA Institutional Deal) Swansea University 2025-09-04T12:28:27.1919654 2025-07-14T09:18:31.8669235 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Mark Evans 1 69952__34858__3da0fdf06dd74a638a06d6164689b3c2.pdf 69952.pdf 2025-07-29T13:07:58.4026396 Output 3228763 application/pdf Version of Record true The Author(s) 2025. This article is licensed under a Creative Commons Attribution 4.0 International License. true eng http://creativecommons.org/licenses/by/4.0/
title The Relative Importance of Creep Hardening, Softening, and Damage in the Determination of Creep Failure Using a Monkman–Grant-Type Relation Derived Within the 4-θ Methodology
spellingShingle The Relative Importance of Creep Hardening, Softening, and Damage in the Determination of Creep Failure Using a Monkman–Grant-Type Relation Derived Within the 4-θ Methodology
Mark Evans
title_short The Relative Importance of Creep Hardening, Softening, and Damage in the Determination of Creep Failure Using a Monkman–Grant-Type Relation Derived Within the 4-θ Methodology
title_full The Relative Importance of Creep Hardening, Softening, and Damage in the Determination of Creep Failure Using a Monkman–Grant-Type Relation Derived Within the 4-θ Methodology
title_fullStr The Relative Importance of Creep Hardening, Softening, and Damage in the Determination of Creep Failure Using a Monkman–Grant-Type Relation Derived Within the 4-θ Methodology
title_full_unstemmed The Relative Importance of Creep Hardening, Softening, and Damage in the Determination of Creep Failure Using a Monkman–Grant-Type Relation Derived Within the 4-θ Methodology
title_sort The Relative Importance of Creep Hardening, Softening, and Damage in the Determination of Creep Failure Using a Monkman–Grant-Type Relation Derived Within the 4-θ Methodology
author_id_str_mv 7720f04c308cf7a1c32312058780d20c
author_id_fullname_str_mv 7720f04c308cf7a1c32312058780d20c_***_Mark Evans
author Mark Evans
author2 Mark Evans
format Journal article
container_title Metallurgical and Materials Transactions A
container_volume 0
publishDate 2025
institution Swansea University
issn 1073-5623
1543-1940
doi_str_mv 10.1007/s11661-025-07905-2
publisher Springer Science and Business Media LLC
college_str Faculty of Science and Engineering
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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 Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
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description An analysis of minimum creep rates vs. time to failure is a suggested approach to the evaluationof long-term creep rupture. But this requires constancy of this relation over all test conditions.This paper therefore used the 4-h methodology to study in more detail the role of creepmechanisms in determining the nature of this relationship and from this, the stability of therelationship. It was found that the Monkman–Grant constant depended negatively on the rateof damage accumulation, the initial strain rate, and the rate of hardening, but positively on thestrain at failure. It was also found that at 833 K and a high stress, h4 was the major determinantof failure times. But as the stress level fell, the parameters h3 and h1 become more important.The growing importance of h3 with decreasing stress implies a bigger role for damageaccumulation with decreasing stress (as ^W =1/h3). At the highest stress, the rate of softeningwas the biggest contributor to variations in failure time but with decreasing stress, damageaccumulation and hardening play a bigger role in determining the variation in failure times.
published_date 2025-07-25T05:28:21Z
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score 11.089572

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