Numerical methods for stress intensity factor Delta K calculations of fretting cracked interface
Résumé
Plain fretting experiments generate cracks under partial slip conditions. The maximum projected crack length (b(p)) related to the fretting crack achieved after a certain number of cycles is measured and the corresponding stress intensity factor range Delta K is computed. This work compares several methods for computing Delta K: a classic approach using McEwen's distribution, an indirect method using FE simulation and weight functions (decoupled approach), and complete FE simulations using Rice's integrals (coupled approach). The decoupled approach is faster than the coupled one and gives conservative results for long cracks whereas for shorter cracks and for a better approximation, the coupled approach is more relevant. The present study is limited to plain fretting cylinder (Ti-6Al-4V)/flat (Al-7050-T7451) configuration in partial slip.