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Assessing the capability of the Wilshire equations in predicting uniaxial creep curves: An application to Waspaloy

Mark Evans Orcid Logo, Tom Williams

International Journal of Pressure Vessels and Piping, Volume: 172, Pages: 153 - 165

Swansea University Authors: Mark Evans Orcid Logo, Tom Williams

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DOI (Published version): 10.1016/j.ijpvp.2019.03.032

Abstract

It is important to be able to predict creep strains in aeroengine so as to enable small punch disc test results to be related to uniaxial creep test results using finite element models. The capability of the Wilshire equation to interpolate creep curves was assessed using creep tests on Waspaloy. Th...

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Published in: International Journal of Pressure Vessels and Piping
ISSN: 0308-0161
Published: Elsevier BV 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa49705
Abstract: It is important to be able to predict creep strains in aeroengine so as to enable small punch disc test results to be related to uniaxial creep test results using finite element models. The capability of the Wilshire equation to interpolate creep curves was assessed using creep tests on Waspaloy. This assessment required modifying the Wilshire equation for time to strains so that the parameters of this equation could be predicted as a function of strain in a way that did not allow predicted creep curves to double back on themselves. An artificial neural network was used to achieve this. It was found that the modified model was capable of interpolating the shape and the end points of the experimental creep curves. These modifications enabled the activation energy to be measured and it was found that the activation energy is dependent upon the average internal stress and thus strain.
Keywords: Creep curves, Wilshire equations, Interpolative evaluation, ANN
Start Page: 153
End Page: 165

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