Abstract
The present work is concerned with the study of interface crack using the extrinsic cohesive zone model (CZM) that nullifies the crack tip stress singularity. A semi-analytical procedure combining the generalized crack opening displacement solution and the finite element (FE) result is shown to estimate the traction-separation law (TSL) parameters. The stress intensity factor (SIF), which symbolizes the strength of the singularity, is computed using the domain-independent interaction integral that considers crack-face traction. The SIF obtained from the FE simulations is plotted along the cohesive zone length to demonstrate the reduction in the strength of the crack tip singularity and found in good agreement with the analytical solutions. Finally, the effectiveness of the proposed procedure is validated for an interface crack propagation between isotropic parent materials.
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