13th International Conference on Fracture June 16–21, 2013, Beijing, China 5 Figure 2. The variation of static SIFs with crack orientation angle under crack surface pressure ( 0 1.0 a ) Figure 3. The variation of static SIFs with crack orientation angle under crack surface pressure ( 0 1.0 a ) The stress intensity factor in the time domain can be obtained from Eqs.(27-30) by using Laplace numerical inversion by Miller and Guy [15]. 5. Numerical results and discussion The following analysis will be conducted under the plane strain state. The surface of the crack loaded by 10 ( ) H t and 20 ( ) H t respectively, where 10 and 20 are constant tractions. Poisson's ratio is taken as 0.3 . The dynamic stress intensity factors are normalized by 0 10 0 k a and 20 0 k a for different loads respectively, where 0 ( ) / 2 a b a . 2 0 0 / c is the shear wave velocity, 2 0 / c t a is the non-dimensional time.
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