Abstract
The propagation characteristics of a crack in a brittle, linear elastic material are investigated. The material is supposed to be orthotropic as regards stress-strain relations, and the stresses in the solid, and the normal displacement are found exactly. The result shows that the displacement of the surface is elliptic as in the static case. Also by consideration of the energy flow into the ends of the crack and using a suitable fracture criteria, we can find bounds on the velocity of propagation. In the special case of isotropy the solution reduces to that given by Broberg [2].
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