Averaged strain energy density evaluated rapidly from the singular peak stresses by FEM: cracked components under mixed-mode (I + II) loading

摘要: Abstract The strain energy averaged in a material-dependent structural volume (SED parameter) proved to efficiently account for notch effects static as well fatigue strength problems. In this work, method is presented rapidly evaluate the SED parameter from singular peak stresses determined by finite element (FE) at tip of cracks subjected mixed mode (I + II) loading. Coarse meshes automatically obtained free mesh generation algorithm available commercial software program can be used. Therefore, refinement close crack avoided. proposed approach takes advantage existing Peak Stress Method (PSM), which provides some expressions estimate I and II stress intensity factors (SIFs) starting elastic evaluated FEM. Because closed-form expression function SIFs latter stresses, formulated straightforward manner. By using new approach, geometrical modelling volume, inside should averaged, no longer necessary. Several analyses have been carried out on cracked plates tension loading, varying length inclination (i.e., mixity) size adopted elements. approximated values calculated coarse systematically compared with those directly FE strain-energy very refined verify range applicability such an approach.