13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- Figure 12. a) Correlation dy/dx = f(d) and dy/dx average = d(KI = KII) for experimental data and model results. b) Correlation dy/dx = f(d) and dy/dx max = d(KI = KII) for experimental data and model results. Figure 13. Correlation dy/dx = f(b) and dy/dx average = b(KI = KII) for experimental data and model results. b) Correlation dy/dx = f(b) and dy/dx max = b(KI = KII) for experimental data and model results. D Ki KII KI crossover global maximum Dm Figure 14. Possible criteria for change from interface crack to kink crack. To some extent, the model tends to underestimate the slope required for transfer form mixed mode crack growth over to crack growth under a KI dominated stress state. Hence, it can be argued that the stress state is overestimated at the interface. From these facts the conclusion could be that the 0 0,5 1 1,5 2 2,5 0 0,2 0,4 0,6 0,8 1 1,2 crack deflection location d [-] slope dy/dx [-] experimental model prediction dy/dx average model prediction dy/dx max 0 0,5 1 1,5 2 2,5 0 0,2 0,4 0,6 0,8 1 1,2 1,4 crack deflection location b [-] slope dy/dx [-] experimental model prediction dy/dx average model prediction dy/dx max
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