Mechanical stress wave propagation in a long, thin, isotropic, elastic rod containing a single transverse edge crack is studied theoretically and experimentally. It is found that one-dimensional wave theories, coupled with an effective "compliance" of the cracked region, predict reasonably well the observed dynamic strains induced by a longitudinal impact. Remote sensing of relatively deep cracks appears feasible and consequently the procedure may be useful clinically for determining the rate of healing of partially cracked bone. © 1978.
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