Investigation on behavior of crack penetration/deflection at interfaces in intelligent coating system

doi:10.1007/s10483-015-1921-9

Abstract

Abstract: 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 α₁ between the substrate and the driving layer. It also strongly depends on the elastic mismatch α₂ 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 α₂ 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.

Key words: energy criterion, interface, finite element method, crack deflection, intelligent coating, crack penetration

2010 MSC Number:

O346
V215

Yang SUN;Wenjuan WANG;Binbin LI;Mabao LIU. Investigation on behavior of crack penetration/deflection at interfaces in intelligent coating system. Applied Mathematics and Mechanics (English Edition), 2015, 36(4): 465-474.

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