Reliability Calculation for a Multilayered Coating Based on a Model with Independently (Sequentially) Degrading Layers
| Autor: | Aleksei Osinnii, Anatoli Chigarev, Jury Bublikov, Mikhail Mosyanov, Anton Kekalo |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Stochastic process Physics QC1-999 020502 materials Markov process Fracture mechanics 02 engineering and technology Surface finish engineering.material symbols.namesake 020303 mechanical engineering & transports 0205 materials engineering 0203 mechanical engineering Coating Free surface engineering symbols Surface roughness Composite material Layer (electronics) |
| Zdroj: | EPJ Web of Conferences, Vol 248, p 04010 (2021) |
| ISSN: | 2100-014X |
| DOI: | 10.1051/epjconf/202124804010 |
| Popis: | 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 10-6mm/s (when the surface roughness is low) to 10-4mm/s (when the surface roughness is high). |
| Databáze: | OpenAIRE |
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