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Life Prediction Under Biaxial Loading Based on the Growth Behaviour of Short Cracks

Biaxial fatigue tests were performed with thick walled tubular specimens made out of a ferritic structural steel and an austenitic stainless steel. Cyclic hardening/softening, crack initiation, crack growth, and cycles to failure were measured. The cyclic stress strain behaviour was found to be close to the Masing behaviour. Thus the AJ and the related damage parameter, Zip, were used to describe the growth of intermediate cracks and the resulting cycles to failure. It was found that by using these parameters the data obtained in tension, torsion and biaxial tests can be described by one universal law.