13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- the test confirms the applicability of the hybrid method in predicting the fracture resistance for the Mode I dominant specimen AM1. (a) (b) (c) (d) Figure 5. Determination of the strain energy for the Mode I dominant specimen, AM1: (a) The moment-rotation curves computed from multiple FE models; (b) the shear force versus shear deformation computed from multiple FE models; (c) the Mode I strain energy versus the change in the crack size; and (d) Mode II strain energy versus the change in the crack size. Figures 6c and 6d compare the J-R curves reproduced from the hybrid approach and those obtained from the test for mode II dominant specimen, AM5. Very close agreement between the results obtained from these two methods is observed when Δa < 1 mm, as shown in Figure 6c and 6d. As Δa > 1 mm, the hybrid approach yields slightly lower (conservative) J-R curves.
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