MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 卷:781 |
Indentation creep vs. indentation relaxation: A matter of strain rate definition? | |
Article | |
Baral, Paul1,2 Kermouche, Guillaume2 Guillonneau, Gaylord1 Tiphene, Gabrielle1 Bergheau, Jean-Michel3 Oliver, Warren C.4 Loubet, Jean-Luc1 | |
[1] Univ Lyon, Ecole Cent Lyon, CNRS, UMR 5513,LTDS, F-69134 Ecully, France | |
[2] Univ Lyon, Mines St Etienne, CNRS, UMR 5307,LGF,Ctr SMS, F-42023 St Etienne, France | |
[3] Univ Lyon, Ecole Natl Ingenieurs St Etienne, CNRS, UMR 5513,LTDS, F-42023 St Etienne, France | |
[4] KLA Nanomech Inc, Oak Ridge, TN 37830 USA | |
关键词: Nanoindentation; Strain rate sensitivity; Relaxation; Creep; Selenium; | |
DOI : 10.1016/j.msea.2020.139246 | |
来源: Elsevier | |
【 摘 要 】
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 (epsilon)over dot(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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