Analisi a fatica di una giunzione rivettata a semplice sovrapposizione con il Dual Boundary Element Method

The fatigue behavior of a riveted lap joint panel is analyzed with the Dual Boundary Element Method (DBEM): in particular an MSD scenario is obtained from the simultaneous initiation and propagation of different cracks from the most loaded holes. The analysis is two-dimensional with no allowance for the secondary bending effects that are judged negligible due to the reduced thicknesses of the involved plates. The lap joints considered has three rivet rows and, when the initial cracks are sufficiently short, the allowance for non linear pin-rivet contact conditions is provided. The cracks are modeled with discontinuous elements and the Stress Intensity Factors (SIF’s) are calculated by the J-integral approach. The crack growth rate is calculated by the well known Paris law getting a satisfactory correlation with numerical and experimental findings available from the literature.