13th International Conference on Fracture June 16–21, 2013, Beijing, China 6 Before the analysis, the validity of the analytical solution must be verified. First, we restrict our attention to the crack problem in FGM under static loading. The corresponding static problem was Figure 4. The variation of DSIFs with crack orientation angle under crack surface pressure ( 0 0.5 a ) studied in [12]. Figs. 2-3 show the variations of the normalized SIFs with the angle under the uniform normal traction. These results are very similar to Konda's results [12]. Figure 5. The variation of DSIFs with crack orientation angle under crack surface pressure ( 0 0.5 a ) Figs.4-5 show the influence of on the DSIFs. It can be found that the peak value of 0 ( , ) / IK a t k decreases with an increase of regardless of the value of 0a . For 0 0.5 a , the peak value of 0 ( , ) / IK b t k increases with the increasing of . And meanwhile, the emergence of time for the DSIFs gradually delays with the decreasing of . Figs.6-7 depict the variations of the normalized mode II DSIFs with the crack direction angle under
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