Applied Mathematics and Mechanics (English Edition) ›› 2015, Vol. 36 ›› Issue (4): 465-474.doi: https://doi.org/10.1007/s10483-015-1921-9

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

Yang SUN, Wenjuan WANG, Binbin LI, Mabao LIU   

  1. State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an 710049, China
  • 收稿日期:2014-05-13 修回日期:2014-09-05 出版日期:2015-04-01 发布日期:2015-04-01
  • 通讯作者: Mabao LIU E-mail:mliu@mail.xjtu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (No. 51175404)

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

Yang SUN, Wenjuan WANG, Binbin LI, Mabao LIU   

  1. State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an 710049, China
  • Received:2014-05-13 Revised:2014-09-05 Online:2015-04-01 Published:2015-04-01
  • Contact: Mabao LIU E-mail:mliu@mail.xjtu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (No. 51175404)

摘要: 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.

关键词: crack penetration, finite element method, crack deflection, energy criterion, interface, intelligent coating

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

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