Many engineering polymers such as polyethylene undergo cold drawing. Consequently, a slowly growing crack in polyethylene is preceeded by a process zone consisting of drawn material. The crack and the process zone are considered to be a single entity called the Crack Layer (CL). The equilibrium s u e and shape of the process zone can be determined by minimizing the Gibbs potential of the material. The result is a system of integro-differential equations which does not have analytic solutions. To simpllfy the …
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