Simulation of Creep Crack Growth in Degraded Polyethylene
Plastics used for structural applications are often subjected to creep loading and component lifetime will be limited by crack propagation. A novel finite element model of crack growth in high density polyethylene (HDPE) subjected to creep loading has been developed. The model is comprised of a viscoplastic model of the bulk material and a cohesive zone model for tracking crack growth. Model parameters are found by curve fit to experimental data for polyethylene film samples. Model predictions for creep behavior and time to failure under creep loading conditions are compared to published data for HDPE. The model predicts the trends observed in the published data. The researchers will use Abaqus.
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