Отправить статью по E-mail Improved core model of indentation and its application to measure diamond hardness
- Авторы: Galanov B.A.1, Milman Y.V.1, Ivakhnenko S.A.2, Suprun O.M.2, Chugunova S.I.1, Golubenko A.A.1, Tkach V.N.2, Litvin P.M.3, Voskoboinik I.V.1
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Учреждения:
- Frantsevich Institute for Materials Science Problems
- Bakul Institute for Superhard Materials
- Lashkarev Institute of Physics of Semiconductors
- Выпуск: Том 38, № 5 (2016)
- Страницы: 289-305
- Раздел: Production, Structure, Properties
- URL: https://journals.rcsi.science/1063-4576/article/view/185642
- DOI: https://doi.org/10.3103/S1063457616050014
- ID: 185642
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Аннотация
A model of the indentation using conical and pyramidal indenters has been proposed, in which not only a sample but the indenter as well are elastoplastically deformed and their materials obey the Mises yield condition. These conditions are characteristic of the measuring of diamond hardness through a diamond indenter. The model that has been proposed generalizes and refines the known simplified Johnson’s model, which uses an elastically deformed indenter. The proposed model makes it possible to determine approximately the sizes of elastoplastic zones in the indenter and sample, the effective apex angle of the loaded indenter and effective angles of the indenter and imprint after unloading. Based on this model a procedure of the determination of the sample and indenter yield strengths (Ys and Yi, respectively) has been developed, in which the relations that use the experimental values of the effective angle of the sample imprint and measured values of the Meyer hardness, HM (mean contact pressure) are added to theoretical relations of the indentation model. The developed computational procedure was applied in indentation experiments on synthetic diamond at the temperature 900°C (at which diamond exhibits a noticeable plastic properties) using natural diamond pyramidal indenters having different apex angles. According to the proposed model, the stress-strain states of samples and indenters have been investigated and their yield strengths and plasticity characteristics were defined. The stress–strain curve of the diamond in the stress-total strain coordinates has been constructed. The strain hardening of diamond was also studied.
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Об авторах
B. Galanov
Frantsevich Institute for Materials Science Problems
Автор, ответственный за переписку.
Email: gbaprofil@bk.ru
Украина, vul. Krzhizhanovs’kogo 3, Kiev, 03680
Yu. Milman
Frantsevich Institute for Materials Science Problems
Email: alona_suprun@mail.ru
Украина, vul. Krzhizhanovs’kogo 3, Kiev, 03680
S. Ivakhnenko
Bakul Institute for Superhard Materials
Email: alona_suprun@mail.ru
Украина, vul. Avtozavods’ka 2, Kiev, 04074
O. Suprun
Bakul Institute for Superhard Materials
Автор, ответственный за переписку.
Email: alona_suprun@mail.ru
Украина, vul. Avtozavods’ka 2, Kiev, 04074
S. Chugunova
Frantsevich Institute for Materials Science Problems
Email: alona_suprun@mail.ru
Украина, vul. Krzhizhanovs’kogo 3, Kiev, 03680
A. Golubenko
Frantsevich Institute for Materials Science Problems
Email: alona_suprun@mail.ru
Украина, vul. Krzhizhanovs’kogo 3, Kiev, 03680
V. Tkach
Bakul Institute for Superhard Materials
Email: alona_suprun@mail.ru
Украина, vul. Avtozavods’ka 2, Kiev, 04074
P. Litvin
Lashkarev Institute of Physics of Semiconductors
Email: alona_suprun@mail.ru
Украина, pr. Nauky 45, Kiev, 03028
I. Voskoboinik
Frantsevich Institute for Materials Science Problems
Email: alona_suprun@mail.ru
Украина, vul. Krzhizhanovs’kogo 3, Kiev, 03680
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