| Autor: |
Nadykto, A., Aleksic, N., Lima, P., Pivkin, P., Uvarova, L., Jiang, X., Zelensky, A., Osinnii, Aleksei, Chigarev, Anatoli, Bublikov, Jury, Mosyanov, Mikhail, Kekalo, Anton |
| Předmět: |
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| Zdroj: |
EPJ Web of Conferences; 4/26/2021, Vol. 248, p1-5, 5p |
| Abstrakt: |
The paper proposes methods to predict the reliability of a multilayered coating based on a model with independently (sequentially) degrading layers. For the mathematical description of the process of crack penetration into the depth of a layered solid body from the free surface with certain roughness, the propagation of a crack tip into a layer adjacent to the free boundary of the coating is considered. This stochastic process is described through the specification of all multipoint probability distributions (densities), and it represents a Markov process. A mathematical model, described by equations of the parabolic type, is proposed to describe the above-mentioned process. Based on the above model, graphs are constructed to describe the change in the time of the crack propagation through a layer depending on the surface roughness and the ultimate strength (ductility) of the coating. The crack growth rate will be in the range from 10-6 mm/s (when the surface roughness is low) to 10-4 mm/s (when the surface roughness is high). [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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