Estimation of singular stress field for an interface crack in orthotropic dissimilar plates by using the results for isotropic dissimilar plate

Abstract

The stress state at the interface in bonded materials can be expressed by material composite parameters. For isotropic dissimilar materials, it is known as the Dundurs parameters. The composite parameters have been derived for orthotropic dissimilar materials, but the relation between the composite parameters and the stress intensity factor of interface crack has not been clarified. In this study, the interface crack problems in orthotropic bonded materials are analyzed by the proportional method. The stress intensity factors of interface crack in orthotropic materials are compared with those of the interface crack in isotropic dissimilar materials, based on the material composite parameters. From the numerical results, the stress intensity factors and the singular stress field of interface crack in orthotropic dissimilar material can be roughly evaluated from that of interface cracks in isotropic dissimilar material when the material combination parameters are the same.