Experimental and theoretical investigations on the transferability of standard JR curves to structures similar to components

Based on the analytical relationships of linear elastic fracture mechanics and finite element calculations for the elastic and elastic/plastic material law, the effect of a superimposed load component parallel to the crack on the crack field and the stress parameters KI, J and CTOD are examined, using the example of X6CrNi1811 steel. The results show that stresses neutral to transverse load can only be assumed in the elastic zone and in a region of narrowly limited plastic zone. In the case of negative transverse stresses, there is large plasticisation with progressive course of the J and CTOD parameters even at relatively low loads, which greatly limits the applicability of an assessment based on KIc values. (orig.)