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The reliability of S shaped curve creep models when the high temperature tensile strength is strain rate dependent
International Journal of Pressure Vessels and Piping, Volume: 214, Start page: 105418
Swansea University Author:
Mark Evans
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DOI (Published version): 10.1016/j.ijpvp.2024.105418
Abstract
It is important to be able to predict the creep life of materials used in power plants and aeroengines. This paper illustrates the role played by a materials tensile strength in achieving this. It also shows that published high temperature tensile strength values are not always suitable for use in c...
| Published in: | International Journal of Pressure Vessels and Piping |
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| ISSN: | 0308-0161 1879-3541 |
| Published: |
Elsevier BV
2025
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa68630 |
| Abstract: |
It is important to be able to predict the creep life of materials used in power plants and aeroengines. This paper illustrates the role played by a materials tensile strength in achieving this. It also shows that published high temperature tensile strength values are not always suitable for use in certain creep models due to its strain rate dependency. Using strain rates larger than those used by NIMS (0.00125/s) resulted in more sensible estimates of the activation energy for creep. Using these larger strain rates also resulted in an improved fit of these models to the experimental data. Using a strain rate of 0.0133/s instead of 0.00125/s also lead to substantial reduction in the proportion of any prediction error that was random in nature. When using a strain rate of 0.0133/s, good predictions of life out to 130,000 h can be made from data with a maximum life of 1230 h. |
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| Keywords: |
S shaped curve creep models; Strain rate; Creep testing; Tensile testing |
| College: |
Faculty of Science and Engineering |
| Funders: |
This research was not funded by research council grants or private sponsors and as such there are no financial relationships to declare. |
| Start Page: |
105418 |