Abstract
The Dugdale model has been extended to a dynamically expanding crack in an orthotropic material. The stresses in the plastic zone as functions of applied stress, plastic zone tip speed and crack speed are derived. Expression for the energy release rate is obtained. The effects of plastic anisotropy and elastic anisotropy on ductile crack propagation are studied using a quadratic yield criterion and an admissible condition for self-similar crack expansion.
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