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Dynamic stress intensity factor of a crack perpendicular to the weak-discontinuous interface in a nonhomogeneous coating–substrate structure

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Abstract

A mechanical model was established for the antiplane dynamic fracture problem of a functionally graded coating–substrate structure with a coating crack perpendicular to the weak-discontinuous interface. The problem was reduced to a Cauchy singular integral equation by the methods of Laplace and Fourier integral transforms. Erdogan’s collocation method and the Laplace numerical inversion proposed by Miller and Guy were used to calculate the dynamic stress intensity factors. Three conclusions were drawn through parametric studies: (a) unlike the conclusion drawn for an interfacial crack, reducing the weak discontinuity of the interface will not necessarily decrease the dynamic stress intensity factor (DSIF) of the coating crack perpendicular to the interface; (b) increasing the stiffness of the substrate when that of the coating is fixed, or decreasing the stiffness of coating when that of the substrate is fixed, will be beneficial for the reduction of the DSIF of a coating crack perpendicular to the interface; and (c) the free surface has a greater influence on the DSIF than the interface does, and the effect of the interface on the DSIF is greater than that of the material stiffness in the crack-tip region.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Academy of Armored Force Engineering, No.21, Du Jia Kan, Chang Xin Dian, 100072, Beijing, People’s Republic of China

    Yong-Dong Li & Nan Zhang

  2. School of Mechanical Engineering, Yonsei University, Seoul, 120-749, South Korea

    Kang Yong Lee

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  1. Yong-Dong Li
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  2. Kang Yong Lee
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  3. Nan Zhang
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Correspondence to Kang Yong Lee.

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Li, YD., Lee, K.Y. & Zhang, N. Dynamic stress intensity factor of a crack perpendicular to the weak-discontinuous interface in a nonhomogeneous coating–substrate structure. Arch Appl Mech 79, 175–187 (2009). https://doi.org/10.1007/s00419-008-0227-4

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  • DOI: https://doi.org/10.1007/s00419-008-0227-4

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