Strain Energy Release Rate for a Crack under Combined Mode I and Mode II.
WATERVLIET ARSENAL N Y
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The energy release rate for a crack subjected simultaneously to mode I and mode II conditions is computed. The energy was computed by path-independent integrals, using the elastic solution of a deflected crack, having a main branch and a propagation branch. The elasticity solution was obtained from the functional integral equations by the process of iterations. This process leads to a point-wise exact solution in the limit as the propagation branch goes to zero. Using the Griffith-Irwin criterion, incipient paths of propagation of such a crack were obtained from the maximum value of the energy release rate. An experiment, which gives a pure mode II condition at the tip of the crack, was devised. The results were in excellent agreement with the theory. The energy release rate, in parametric form, can be used for any crack subjected to mode I and mode II loading conditions. Author, modified-PL
- Solid State Physics