Characterization of the Strain-Rate-Dependent Plasticity of Alloys Using Instrumented Indentation Tests

Instrumented indentation tests are an efficient approach for the characterization of stress–strain curves instead of tensile or compression tests and have recently been applied for the evaluation of mechanical properties at elevated temperatures. In high-temperature tests, the rate dependence of the...

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Autores principales:	Ta-Te Chen, Ikumu Watanabe, Tatsuya Funazuka
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	strain-rate-dependent plasticity instrumented indentation test finite elements mechanical testing Crystallography QD901-999
Acceso en línea:	https://doaj.org/article/06c6a348c6e045518f33ff85b1e5518b
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spelling	oai:doaj.org-article:06c6a348c6e045518f33ff85b1e5518b2021-11-25T17:18:11ZCharacterization of the Strain-Rate-Dependent Plasticity of Alloys Using Instrumented Indentation Tests10.3390/cryst111113162073-4352https://doaj.org/article/06c6a348c6e045518f33ff85b1e5518b2021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4352/11/11/1316https://doaj.org/toc/2073-4352Instrumented indentation tests are an efficient approach for the characterization of stress–strain curves instead of tensile or compression tests and have recently been applied for the evaluation of mechanical properties at elevated temperatures. In high-temperature tests, the rate dependence of the applied load appears to be dominant. In this study, the strain-rate-dependent plasticity in instrumented indentation tests at high temperatures was characterized through the assimilation of experiments with a simulation model. Accordingly, a simple constitutive model of strain-rate-dependent plasticity was defined, and the material constants were determined to minimize the difference between the experimental results and the corresponding simulations at a constant high temperature. Finite element simulations using a few estimated mechanical properties were compared with the corresponding experiments in compression tests at the same temperature for the validation of the estimated material responses. The constitutive model and determined material constants can reproduce the strain-rate-dependent material behavior under various loading speeds in instrumented indentation tests; however, the load level of computational simulations is lower than those of the experiments in the compression tests. These results indicate that the local mechanical responses evaluated in the instrumented indentation tests were not consistent with the bulk responses in the compression tests at high temperature. Consequently, the bulk properties were not able to be characterized using instrumented indentation tests at high temperature because of the scale effect.Ta-Te ChenIkumu WatanabeTatsuya FunazukaMDPI AGarticlestrain-rate-dependent plasticityinstrumented indentation testfinite elementsmechanical testingCrystallographyQD901-999ENCrystals, Vol 11, Iss 1316, p 1316 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	strain-rate-dependent plasticity instrumented indentation test finite elements mechanical testing Crystallography QD901-999
spellingShingle	strain-rate-dependent plasticity instrumented indentation test finite elements mechanical testing Crystallography QD901-999 Ta-Te Chen Ikumu Watanabe Tatsuya Funazuka Characterization of the Strain-Rate-Dependent Plasticity of Alloys Using Instrumented Indentation Tests
description	Instrumented indentation tests are an efficient approach for the characterization of stress–strain curves instead of tensile or compression tests and have recently been applied for the evaluation of mechanical properties at elevated temperatures. In high-temperature tests, the rate dependence of the applied load appears to be dominant. In this study, the strain-rate-dependent plasticity in instrumented indentation tests at high temperatures was characterized through the assimilation of experiments with a simulation model. Accordingly, a simple constitutive model of strain-rate-dependent plasticity was defined, and the material constants were determined to minimize the difference between the experimental results and the corresponding simulations at a constant high temperature. Finite element simulations using a few estimated mechanical properties were compared with the corresponding experiments in compression tests at the same temperature for the validation of the estimated material responses. The constitutive model and determined material constants can reproduce the strain-rate-dependent material behavior under various loading speeds in instrumented indentation tests; however, the load level of computational simulations is lower than those of the experiments in the compression tests. These results indicate that the local mechanical responses evaluated in the instrumented indentation tests were not consistent with the bulk responses in the compression tests at high temperature. Consequently, the bulk properties were not able to be characterized using instrumented indentation tests at high temperature because of the scale effect.
format	article
author	Ta-Te Chen Ikumu Watanabe Tatsuya Funazuka
author_facet	Ta-Te Chen Ikumu Watanabe Tatsuya Funazuka
author_sort	Ta-Te Chen
title	Characterization of the Strain-Rate-Dependent Plasticity of Alloys Using Instrumented Indentation Tests
title_short	Characterization of the Strain-Rate-Dependent Plasticity of Alloys Using Instrumented Indentation Tests
title_full	Characterization of the Strain-Rate-Dependent Plasticity of Alloys Using Instrumented Indentation Tests
title_fullStr	Characterization of the Strain-Rate-Dependent Plasticity of Alloys Using Instrumented Indentation Tests
title_full_unstemmed	Characterization of the Strain-Rate-Dependent Plasticity of Alloys Using Instrumented Indentation Tests
title_sort	characterization of the strain-rate-dependent plasticity of alloys using instrumented indentation tests
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/06c6a348c6e045518f33ff85b1e5518b
work_keys_str_mv	AT tatechen characterizationofthestrainratedependentplasticityofalloysusinginstrumentedindentationtests AT ikumuwatanabe characterizationofthestrainratedependentplasticityofalloysusinginstrumentedindentationtests AT tatsuyafunazuka characterizationofthestrainratedependentplasticityofalloysusinginstrumentedindentationtests
_version_	1718412509435658240

Characterization of the Strain-Rate-Dependent Plasticity of Alloys Using Instrumented Indentation Tests

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