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An interface crack in a coating-substrate composite with mixed-mode Dugdale corrections

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Abstract

Considering both plane stress and plane strain conditions, the plastic zone size and the crack tip opening displacement of an interface crack between a coating and a semi-infinite substrate under a normal load on the crack surfaces are investigated by the mixed-mode Dugdale model. In the model, stresses applied in the plastic zones satisfy the Von Mises yield criterion. The plastic zone size can be calculated by satisfying the condition that the complex stress intensity factors vanish. After the plastic zone size is solved, the crack tip opening displacement can be obtained by dislocation theories. In numerical examples, a uniform load is considered, and the effects of the normalized elastic modulus (the ratio of the elastic modulus of the coating to the elastic modulus of the substrate) and the normalized crack depth (the ratio of the coating thickness to the interface crack length) on the normalized plastic zone size and the normalized crack tip opening displacement are examined. Numerical examples show in the case of thin coatings, the value of the normalized plastic zone size decreases with increasing the normalized elastic modulus.

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Authors and Affiliations

  1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, Singapore

    D. K. Yi & Z. M. Xiao

  2. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore, Singapore

    S. K. Tan

Authors
  1. D. K. Yi
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  2. Z. M. Xiao
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  3. S. K. Tan
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Correspondence to Z. M. Xiao.

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Yi, D.K., Xiao, Z.M. & Tan, S.K. An interface crack in a coating-substrate composite with mixed-mode Dugdale corrections. Int J Fract 179, 201–212 (2013). https://doi.org/10.1007/s10704-012-9792-1

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  • DOI: https://doi.org/10.1007/s10704-012-9792-1

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