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)

Thu Feb 19 01:36:51 JST 1998