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Journal Articles Materials Science and Engineering: A Year : 2020

Indentation creep vs. indentation relaxation: A matter of strain rate definition?

Abstract

An extensive study of the different methods able to measure material creep properties in indentation is proposed. A systematic comparison of the fast creep, long-term creep, constant strain rate and long-term relaxation tests is performed on amorphous selenium. Even though measured apparent activation energy and strain rate sensitivities are very similar for all tests, a discrepancy is highlighted between the creep/constant strain rate tests and the relaxation tests. This effect seems to be related to the strain rate definition which should be a function of the strain rate sensitivity m. In this paper, it is proposed to use a representative strain rate ϵ̇r as proposed by Kermouche et al. (2008). An excellent agreement is found between all the methods, including uniaxial compression when expressing the creep behavior as a function of representative stress and strain rate.

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Materials
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Dates and versions

emse-04511474 , version 1 (19-03-2024)

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Paul Baral, Guillaume Kermouche, Gaylord Guillonneau, Gabrielle Tiphéne, Jean-Michel Bergheau, et al.. Indentation creep vs. indentation relaxation: A matter of strain rate definition?. Materials Science and Engineering: A, 2020, 781, pp.139246. ⟨10.1016/j.msea.2020.139246⟩. ⟨emse-04511474⟩
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