期刊论文详细信息
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
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【 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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