13th International Conference on Fracture June 16–21, 2013, Beijing, China -7- 40 20 20 20 KI KII KIII experimental results of CTSR specimen experimental results of CT specimen 3D-criterion by with = 38,1 N/mm , = 1,155 and R = 0,36 ICHARD K IC 1 3/2 α α2 40 60 80 40 60 80 100 120 Figure 8. Approximation of the 3D-criterion by Richard on experimental results 0,5 0,5 0,5 experimental results of CTSR specimen threshold value surface by R with ICHARD = 1,155 and = 1 α α 1 2 1 1,5 2 2,5 1 1,5 1,5 2 2,5 1 ∆KIII,th ∆KI,th ∆KII,th ∆KI,th ∆KI,th ∆KI,th Figure 9. Threshold values for several Mixed-Mode-loading conditions Moreover, for a complete description of crack growth behavior under general Mixed-Mode-loading the crack kinking and twisting angles were established by using an optical 3D-scanner. In order to prove the reliability of the criteria the determined crack deflection angles φ0 and ψ0 were compared with the predictions of the criteria. The comparison of the crack kinking angle φ0 is shown in barycentric coordinates in Figure 10.
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