13th International Conference on Fracture June 16–21, 2013, Beijing, China -9- Figure 4. Weibull stress trajectories with increased levels of J for the deep crack SE(B) and PCVN specimens: (a) Standard Beremin model; (b) Plastic strain modified Beremin model. Table 2. Estimates of J0 and T0 derived from different forms of the Weibull stress model Weibull Stress Model J 0 (kJ/m2) T 0 (◦C) Standard Beremin ( 0=γ with no plastic strain correction) 54.1 -82.0 Generalized Weibull Stress with 1=γ and 0 =β (linear correction) 100.8 -103.6 Generalized Weibull Stress with 1 2 =γ and 0 =β (square root correction) 137.6 -113.7 Plastic Strain Modified Beremin Model 74.1 -93.2
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