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Instrumented indentation tests are an efficient approach to characterize stress--strain curves instead of tensile or compression tests and have recently been applied to evaluate mechanical properties at elevated temperatures. In high-temperature tests, the rate dependency of the applied load appears 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 of the estimated material response. 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 cases of slow test speeds in compression tests. The results indicated that the error comes from the material behavior of polycrystalline aggregate such as grain boundary sliding in the compression tests because the deformation area of instrumented indentation tests is small enough to evaluate the material behavior of single crystal.

権利情報:

• Creative Commons BY Attribution 4.0 International
  Creative Commons BY Attribution 4.0 International

キーワード: strain-rate-dependent plasticity, instrumented indentation test, finite elements, mechanical testing

刊行年月日: 2021-10-28

出版者: MDPI AG

掲載誌:

• Crystals (ISSN: 20734352) vol. 11 issue. 11 p. 1316-1316

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.3390/cryst11111316

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更新時刻: 2024-01-05 22:12:50 +0900

MDRでの公開時刻: 2023-02-28 11:24:44 +0900