13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- 0 2 4 6 8 10 0 2 4 6 8 10 0 2 4 6 8 10 0 2 4 6 8 10 a) α0=a/c=2.5 b) α0=a/c=1 0 2 4 6 8 10 0 2 4 6 8 10 0 2 4 6 8 10 0 2 4 6 8 10 c) α0=a/c=0.8 d) α0=a/c=0.6 0 2 4 6 8 10 0 2 4 6 8 10 0 2 4 6 8 10 0 2 4 6 8 10 e) α0=a/c=0.4 f) α0=a/c=0.2 Fig. 5. the prediction shape change of crack front
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