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Recent Advances in Creep Modelling Using the θ Projection Method

Will Harrison Orcid Logo

Metals, Volume: 14, Issue: 12, Start page: 1395

Swansea University Author: Will Harrison Orcid Logo

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DOI (Published version): 10.3390/met14121395

Abstract

The theta projection method has been used to predict uniaxial creep curve shapes for a wide range of materials. However, one of the criticisms of the existing method is that the multilinear approach, commonly used to correlate theta parameters to applied test conditions, does not extrapolate well ov...

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Published in: Metals
ISSN: 2075-4701
Published: MDPI AG 2024
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URI: https://cronfa.swan.ac.uk/Record/cronfa68580
first_indexed 2025-01-09T20:33:52Z
last_indexed 2025-01-09T20:33:52Z
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spelling 2024-12-17T13:47:55.2504609 v2 68580 2024-12-17 Recent Advances in Creep Modelling Using the θ Projection Method dae59f76fa4f63123aa028abfcd2b07a 0000-0002-0380-7075 Will Harrison Will Harrison true false 2024-12-17 ACEM The theta projection method has been used to predict uniaxial creep curve shapes for a wide range of materials. However, one of the criticisms of the existing method is that the multilinear approach, commonly used to correlate theta parameters to applied test conditions, does not extrapolate well over a full range of creep conditions, due to not accounting for changes in creep mechanisms. This is particularly important for evaluating the creep behaviour of structural engineering components that operate in an environment in which a wide range of stress and/or temperatures exist during their service life. This study uses the theta projection method to evaluate creep curves for the nickel-based superalloy, Waspaloy, over a range of test conditions, considering changes in observed dominant creep mechanisms. A clear break in the trend of θ3 and θ4 with respect to stress is observed, indicating that a change in mechanism is important for tertiary creep. Using a power law approach along with optimisation algorithms, the residual error between predicted and experimentally observed creep curves is reduced. With more accurate prediction of creep curves, creep rates throughout the duration of creep can be more accurately calculated, providing the basis of more accurate computational creep models. Journal Article Metals 14 12 1395 MDPI AG 2075-4701 Creep; superalloys; theta projection method 5 12 2024 2024-12-05 10.3390/met14121395 COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University Other This research received no external funding. 2024-12-17T13:47:55.2504609 2024-12-17T13:41:45.8215920 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering Will Harrison 0000-0002-0380-7075 1
title Recent Advances in Creep Modelling Using the θ Projection Method
spellingShingle Recent Advances in Creep Modelling Using the θ Projection Method
Will Harrison
title_short Recent Advances in Creep Modelling Using the θ Projection Method
title_full Recent Advances in Creep Modelling Using the θ Projection Method
title_fullStr Recent Advances in Creep Modelling Using the θ Projection Method
title_full_unstemmed Recent Advances in Creep Modelling Using the θ Projection Method
title_sort Recent Advances in Creep Modelling Using the θ Projection Method
author_id_str_mv dae59f76fa4f63123aa028abfcd2b07a
author_id_fullname_str_mv dae59f76fa4f63123aa028abfcd2b07a_***_Will Harrison
author Will Harrison
author2 Will Harrison
format Journal article
container_title Metals
container_volume 14
container_issue 12
container_start_page 1395
publishDate 2024
institution Swansea University
issn 2075-4701
doi_str_mv 10.3390/met14121395
publisher MDPI AG
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 theta projection method has been used to predict uniaxial creep curve shapes for a wide range of materials. However, one of the criticisms of the existing method is that the multilinear approach, commonly used to correlate theta parameters to applied test conditions, does not extrapolate well over a full range of creep conditions, due to not accounting for changes in creep mechanisms. This is particularly important for evaluating the creep behaviour of structural engineering components that operate in an environment in which a wide range of stress and/or temperatures exist during their service life. This study uses the theta projection method to evaluate creep curves for the nickel-based superalloy, Waspaloy, over a range of test conditions, considering changes in observed dominant creep mechanisms. A clear break in the trend of θ3 and θ4 with respect to stress is observed, indicating that a change in mechanism is important for tertiary creep. Using a power law approach along with optimisation algorithms, the residual error between predicted and experimentally observed creep curves is reduced. With more accurate prediction of creep curves, creep rates throughout the duration of creep can be more accurately calculated, providing the basis of more accurate computational creep models.
published_date 2024-12-05T03:08:19Z
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score 11.064692

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