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Determination of Creep Damage Properties from Small Punch Creep Tests Considering Pre-Straining Effect Using an Inverse Approach

Sun, Wei; Liu, Hao

Authors

Wei Sun

Hao Liu



Contributors

Wei Sun
Supervisor

Hao Liu
Sponsor

Abstract

© 2019 Elsevier Ltd Although the small punch creep test (SPCT) has been commonly accepted as an effective small specimen material characterisation technique (e.g. the European Code of Practice (CoP) for small punch test was produced in 2006 to provide a practical guideline for the experimental work and data interpretation of small punch test), the conversion from the experimental results obtained from the SPCT, i.e. displacement-time data, to the corresponding strain-time data obtained from conventional uniaxial creep tests has not been thoroughly understood due to the complex nature of the deformation and material failure mechanisms involved in the SPCT, e.g. contact mechanism, material nonlinearity, large deformation and initial plasticity damage. The current paper presents an inverse method to determine the creep properties directly from the SPCT experimental results, without converting them to the uniaxial creep test data. A finite element (FE) model taking account of the conventionally overlooked pre-straining effect has been employed for an inverse optimisation method for the first time. The inverse method has been proven to be capable of effectively predicting the creep behaviours of a P91 steel at 600 °C with a good agreement to the experimental results.

Citation

Sun, W., & Liu, H. (2019). Determination of Creep Damage Properties from Small Punch Creep Tests Considering Pre-Straining Effect Using an Inverse Approach. Mechanics of Materials, 139, https://doi.org/10.1016/j.mechmat.2019.103171

Journal Article Type Article
Acceptance Date Sep 4, 2019
Online Publication Date Sep 5, 2019
Publication Date Dec 1, 2019
Deposit Date Sep 4, 2019
Publicly Available Date Mar 28, 2024
Journal Mechanics of Materials
Print ISSN 0167-6636
Electronic ISSN 1872-7743
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 139
Article Number 103171
DOI https://doi.org/10.1016/j.mechmat.2019.103171
Keywords Instrumentation; General Materials Science; Mechanics of Materials
Public URL https://nottingham-repository.worktribe.com/output/2564759
Publisher URL https://www.sciencedirect.com/science/article/pii/S0167663619302856?via%3Dihub
Additional Information This article is maintained by: Elsevier; Article Title: Determination of creep damage properties from small punch creep tests considering pre-straining effect using an inverse approach; Journal Title: Mechanics of Materials; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.mechmat.2019.103171; Content Type: article; Copyright: © 2019 Elsevier Ltd. All rights reserved.

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