Overload Effects During Fatigue Crack Growth in Nodular Cast Iron - simulation with an Extended Strip-yield Model

Within this paper an extended strip-yield model for the simulation of fatigue crack growth in nodular cast iron under variable amplitude loading is presented. The model is based on the conventional strip-yield model and by using an additional boundary condition the formerly observed crack acceleration effects after applied overloads can be described. A comparison of experimental results and simulation shows the applicability of the extended strip-yield model for single spike overloads as well as for random load sequences.