numero25

C. J. Christopher, Frattura ed Integrità Strutturale, 25 (2013) 161-166 ; DOI: 10.3221/IGF-ESIS.25.23 166 : Stress intensity values given by the mixed-mode CJP equation, with K F defined perpendicular to the 45° slant crack and K II Figure 4 defined parallel with the slant crack in the CT specimen. C ONCLUSIONS he CJP model has been extended to deal with fatigue cracking under mixed mode I and II conditions, by incorporating an additional anti-symmetric horizontal shear force into the analysis. The model appears able to accurately predict the x and y -displacement fields ahead of the tip of a crack under mixed mode loading. Further work is on-going to explore the accuracy of the predictions, the values of the mixed mode stress intensity factors and their use in predicting fatigue crack growth rates. R EFERENCES [1] James, M.N., Christopher, C.J., Lu, Y. and Patterson, E.A., Local crack plasticity and its influences on the global elastic stress field. Int. J. Fatigue, 46 (2013) 4-15. [2] Ding, F, Zhao, T. and Jiang, Y., A study of fatigue crack growth with changing load direction. Engng Fract. Mech., 74 (2007) 2014-2029. T