Crack Propagation in a Strip of Material under Plane Extension,
LEHIGH UNIV BETHLEHEM PA FRITZ ENGINEERING LAB
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The problem of a uniformly propagating crack in a strip of elastic material is solved using the dynamic equations of elasticity in two dimensions. Two specific conditions of loading on the strip with finite width are discussed. In the first case, the rigidly clamped edges are pulled apart in the oppsite directions. The second case considers equal and opposite directions. The second case considers the strip width to the crack length ratio, the amplitude of the dynamic stresses ahead of the running crack is determined as a function of the crack velocity. The local dynamic stresses are found to be lower than the corresponding static values for the displacement loading condition and higher for the stress loading condition. This effect becomes increasingly more important as the crack length to strip width ratio is enlarged. Numerical results for the dynamic crack opening displacements are also presented.