Abstract
In experimental studies of rapid crack propagation in solids, specimens in the two dimensional single edge notch configuration are commonly used. If the motion of the crack tip differs significantly from steady motion, then Rayleigh surface waves are generated at the crack tip, and these waves propagate along the crack faces in the direction of crack growth. These surface waves can overtake the propagating crack tip. Several investigators have recently observed that the available data suggest that these reflected surface waves play a role in the crack arrest process [1,2]. The purpose here is to give a preliminary report on the evidence available in the theory of elastic crack propagation which supports this suggestion on the influence of surface waves. The elastodynamic boundary value problem which would serve as a model of this process is extremely difficult to solve, and it is unlikely that a solution in which the surface waves effects are separated from other effects will be available in the near future.
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