Abstract
Two basic problems in 2-dimensional elastodynamic fracture analysis, the plane crack expanding from a line flaw at a constant rate and the semi-infinite plane crack, are treated simultaneously by allowing the former problem to have crack edges which equal or exceed the Rayleigh wave speed. As expected the stress singularities and energy flux rate vanish when this occurs. Nevertheless the solutions can be applied to semi-infinite crack problems, including plane wave diffraction. For purposes of illustration, only uniform shear and normal tractions applied to the crack plane are treated. However, the analysis of piecewise constant tractions over uniformly expanding segments readily follows. Homogeneous function techniques are employed in all the solution procedures.
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