PSI - Issue 5

Ahmed Bahloul et al. / Procedia Structural Integrity 5 (2017) 430–437 Ahmed Bahloul et al. / Structural Integrity Procedia 00 (2017) 000 – 000

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Fig. 4.The iso-probabilistic curves for: (a) R=0.1; (b) R=0.5.

4. Conclusions This attempt addresses the prediction of fatigue crack growth life of cracked aircraft component. An engineering probabilistic approach was specially developed using XFEM, RC-SIF and MCS. Particular focus was put on considering the effect of residual stress distribution near the crack tip and material dispersions for predicting the residual fatigue life. According to the findings, it can be concluded that: The XFEM presents an efficient and powerful toll for fatigue crack growth modelling. (ii) The RC-SIF parameter exibits good ability in considering the effect of residual stress distribution near crack tip. (iii) Fatigue life data is random in nature and deterministic models seem to be unable for evaluating the remaining fatigue life of cracked structures due to the material dispersions, which confirms the need for an engineering approach that takes into account this random aspect. The iso-Probabilistic a-N curves corresponding to 5%, 50% and 95% fatigue reliability loadings have been performed. This method allows engineers to be engaged in practical problems for predicting the remaining fatigue life of cracked structures in a more efficient and reliable way. . (i)