Simulation of crack extension in shell structures and prediction of residual strength

Abstract

Two models for the numerical simulation of ductile crack extension in shell structures are presented and compared. They are based on the crack tip opening angle and a cohesive zone approach. After identification of the model parameters and investigations of the mesh dependence, the models are applied to various specimen configurations and structural components. Their excellent numerical performance favors their application for predicting the residual strength of lightweight components like aircraft fuselages.