This work proposes an improved mechanical driving force parameter for crack growth analysis. The proposed parameter investigates fatigue crack growth FCG under constant amplitude loading, considering the influence of residual stress distribution near the crack tip. A 2D FE Analysis is developed in order to compute the stress distribution in the vicinity of the crack tip with in the framework of elastic-plastic fracture mechanics (EPFM). Elastic stress intensity factors are computed using both analytical solution and the extended finite element method (XFEM). Residual stress intensity factors are determined using the weight function through numerical analysis. The authors estimate the residual fatigue crack growth life of 7075-T6 Aluminum alloy attachment lugs with single through-thickness crack under various loading conditions. Moreover, a comparison with the available experimental data is performed. It is proved that this improved mechanical parameter so-called residual-corrected stress intensity factor can better predict fatigue life with a greater accuracy compared with experimental results.
The International Journal of Advanced Manufacturing Technology – Springer Journals
Published: Feb 3, 2017
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