Combined loading fracture trajectories of viscoelastic materials.
Marinshaw, Stephen Alfred Jr.
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The critical stress intensity factors and fracture trajectories for both filled and unfilled viscoelastic plane stress specimens were experimentally determined by controlled crack elongation. Fracture testing included combined displacement loadings both of single and bi-material specimens with initial cracks located in each material and at the bi-material interface. The feasibility of trajectory prediction using an elastic linear-strain finite-element analysis was investigated. Techniques for adapting the elastic model grid patterns to predict viscoelastic trajectories were developed. Measured trajectories correlated well with the directions of maximum principal stress as determined by the finite-element solution of a blunt crack- tip model.
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