Abstract
The transient elastodynamic stress intensity factors (SIF) of a sub-surface semi-infinite crack in an elastic half plane are analyzed. The crack is parallel to the surface of the half plane where a pair of anti-plane force are acting at a fixed position on the crack faces. Exact expressions are obtained for the mode-III SIF as functions of time. The results are exact for the time interval from initial loading until the first wave scattered at the crack tip is reflected three times at the surface of half plane and returns to the crack tip.
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