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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. [ABSTRACT FROM AUTHOR]