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Numerical Example

The probing incident elastic waves (i=1,2,3) are chosen to be 3 plane waves given by (33). The directions of propagation are given by , and , and the experiments are replaced by a simulation with no error. Also the following 8 directions are used as : , , . The Poisson's ratio is 1/4. Fig.3 presents the mode of convergence from the initial guess to the final crack which is almost the same as the true one.

Figure 3: Mode of Convergence---3D Elastodynamics (Collocation)

N. Nishimura
Thu Feb 19 01:36:51 JST 1998