13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- theoretical value measured value variation KIII n K I n KII n 70,5° φ0 φ0 a) b) theoretical value measured value variation KIII n K I n KII n 70,5° φ0 φ0 c) theoretical value measured value variation KIII n KI n KII n 70,5° φ0 φ0 d) theoretical value measured value variation KIII n KI n KII n 70,5° φ0 φ0 Figure 10. a) Comparison of kinking angle with criterion by RICHARD b) Comparison of kinking angle with criterion by SCHÖLLMANN et al. c) Comparison of kinking angle with criterion by DHONDT d) Comparison of kinking angle with criterion by POOK The measured crack kinking angle φ0 coincides very well with the predictions of the hypotheses by RICHARD as well as by SCHÖLLMANN et al. and by DHONDT (see Fig. 10a-c). The maximal deviation here one finds at pure Mode III-loading. In Comparison with the predictions of the criterion by POOK the real crack kinking angle differs considerably from its predictions as soon as Mode III-loading part occurs (Fig. 10d). The measurement results of the crack twisting angle ψ0 exhibit also a very well agreement with the criterion by RICHARD as well as by SCHÖLLMANN et al. (Fig. 11a, 11b). The predictions of the criteria by DHONDT and by POOK show the greatest deviations from the real crack twisting angle (Fig. 11c, 11d).
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