13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- (a) (b) Figure 4. Length 1 2.7 Time 3.9 3.9 5.1 5.1 6.3 6.3 7.5 Free surface Rupture direction; speed c ~ 0.7 cS Rupture front wave Singularity at the tip Rupture direction; c ~ 0.7 cS Rupture front wave Singularity at the tip Surfacing R R I I Surfacing Rf Rh I I I R R C Pf Rh Rf Sf I I I R R C I Sf Pf Strongly disturbed Rh Rf
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