Abstract
The study is concerned with the simulation of cracks in finitely deforming viscoelastic media. The main goal is to establish a computational methodology for crack propagation analyses in bulk material and interface debonding using Extended Finite Element Method and Cohesive Zone Modeling. A linear viscoelastic plate with a double edge crack was selected as a benchmark problem, and the XFEM and CZM analysis results were verified against those from the conventional crack propagation method and those from the literature. Following this, a nonlinear viscoelastic solid rocket motor subjected to various thermal loadings was analyzed for failure due to bore cracking or interface debonding. In particular, the propagation of bore cracks for a cooldown was analyzed using XFEM, and the propagation of initial debonding for a cooldown and cyclic temperature was studied using CZM. Overall it is concluded that, XFEM and CZM are suitable methods for crack propagation analysis in nonlinear viscoelastic media.
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