13th International Conference on Fracture June 16–21, 2013, Beijing, China -9- a) b) MODE-I MODE-II 45° MODE-III KIII n KI n KII n ψ0 ψ0 theoretical value measured value variation MODE-I MODE-II 45° MODE-III KIII n KI n KII n ψ0 ψ0 theoretical value measured value variation c) d) MODE-I MODE-II 45° MODE-III KIII n KI n KII n ψ0 ψ0 theoretical value measured value variation MODE-I MODE-II 45° MODE-III KIII n KI n KII n ψ0 ψ0 theoretical value measured value variation Figure 11. a) Comparison of twisting angle with criterion by RICHARD b) Comparison of twisting angle with criterion by SCHÖLLMANN et al. c) Comparison of twisting angle with criterion by DHONDT d) Comparison of twisting angle with criterion by POOK 5. Conclusion In this paper the suitability for experimental investigations under 3D-Mixed-Mode-loading conditions of the CTSR-specimen in combination with its loading device was presented. The experimental results show obviously higher threshold and fracture toughness values for high Mode III-loading ratios than by criteria predicted. The most exactly predictions indicate the criteria by RICHARD and by SCHÖLLMANN et al. These criteria give the best predictions regarding the crack kinking and twisting angle. Due to their exactness of predictions, they should be implemented in numerical calculation programs.
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