13th International Conference on Fracture June 16–21, 2013, Beijing, China 8 e.g., 0.1 or 0.15 . The peak value of the mode I DSIFs in crack tip a decreases with an increase of . Of interest in the figure is that for the crack angle more than 0.4 , the variation of appears to hardly affect the peak stress intensification at the crack tips. From Fig.9, it can be seen that the peak values of crack tips a and b decrease or increase with an increase of . Figure 8. The influence of crack orientation angle on the peak values of the DSIFs under crack surface pressure Figure 9. The influence of crack orientation angle on the peak values of the DSIFs under crack surface shear 6. Conclusion The elastodynamic response of an arbitrarily oriented crack in functionally graded materials has been investigated with the aid of the basic plane elasticity equations. The mixed-mode DSIFs evaluated for an arbitrarily oriented crack were shown to be strongly affected by the geometric and loading configuration of the media in conjunction with the material gradations in the
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