13th International Conference on Fracture June 16–21, 2013, Beijing, China -5- Figure 2. The effect of Txx, Me and thickness on Keff at s=0 Figure 3. The effect of Tzz, Me and thickness on Keff at s=0 at s=0 Conclusions The three-dimensional stress field ahead of the through-thickness crack under mixed mode (I+II) loading conditions is analyzed. The in-plane and out-of-plane constraint effect are discussed by means of the non-singular terms, namely, Txx-stress and Tzz-stress, respectively. The distribution of the singular and non-singular terms along the crack front has been predicted. The significant effect of specimen thickness on the Tzz-stress in the middle plane of the crack front has been observed. Acknowledgements The authors acknowledge the support of the Russian Foundation of Basic Research (Grant N 12-08-91158-NSFC_а). References [1] S. Liu, Y.J. Chao, Variation of fracture toughness with constraint, International Journal of Fracture, 124 (2003) 113–117. [2] X.K. Xhu, Y.J. Chao. Specimen size requirements for two-parameter fracture toughness testing, International Journal of Fracture, 135 (2005) 117–136. [3] V.F. González-Albuixech, E. Giner, J. Fernández-Sáez, A. Fernández-Canteli, Influence of the t33-stress on the 3-D stress state around corner cracks in an elastic plate, Engineering Fracture Mechanics, 78 (2011) 412–427. [4] Yu.G. Matvienko, V.N. Shlyannikov, N.V. Boychenko, In-plane and out-of-plane constraint parameters along a three-dimensional crack-front stress field under creep loading, Fatigue and Fracture of Engineering Materials and Structures, 36 (2013) 14–24. [5] H.M. Meliani, Yu.G. Matvienko, G. Pluvinage, Two-parameter fracture criterion (Kρ,c-Tef,c)
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