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
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Publicado: MDPI AG 2021
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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
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