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Article Dans Une Revue Materials Science and Engineering: A Année : 2020

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

Résumé

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 $\dot{\epsilon}_r$ 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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Dates et versions

hal-02916177 , version 1 (28-06-2024)

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Paul Baral, Guillaume Kermouche, Gaylord Guillonneau, Gabrielle Tiphene, 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⟩. ⟨hal-02916177⟩
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