Investigation on behavior of crack penetration/deflection at interfaces in intelligent coating system
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- 作者：Yang Sun ; Wenjuan Wang ; Binbin Li ; Mabao Liu
- 关键词：intelligent coating ; energy criterion ; interface ; crack deflection ; crack penetration ; finite element method ; O346 ; V215 ; 74S05 ; 74K35 ; 7405
- 刊名：Applied Mathematics and Mechanics
- 出版年：2015
- 出版时间：April 2015
- 年：2015
- 卷：36
- 期：4
- 页码：465-474
- 全文大小：882 KB
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文摘
Based on the three-phase model, the propagation behavior of a matrix crack in an intelligent coating system is investigated by an energy criterion. The effect of the elastic mismatch parameters and the thickness of the interface layer on the ratio of the energy release rate for infinitesimal deflected and penetrated crack is evaluated with the finite element method. The results show that the ratio of the energy release rates strongly depends on the elastic mismatch α 1 between the substrate and the driving layer. It also strongly depends on the elastic mismatch α 2 between the driving layer and the sensing layer for a thinner driving layer when a primary crack reaches an interface between the substrate and the driving layer. Moreover, with the increase in the thickness of the driving layer, the dependence on α 2 gradually decreases. The experimental observation on aluminum alloys monitored with intelligent coating shows that the established model can better explain the behavior of matrix crack penetration and can be used in optimization design of intelligent coating.