Crack propagation rate and failure life in biaxial low cycle fatigue at elevated temperatures

This paper describes the crack propagation rate and the failure life in the biaxial low cycle fatigue test for a type 304 stainless steel at elevated temperatures. Macro crack propagation rates were observed for the tubular specimen in the push-pull and the reversed torsion tests. The crack propagation rate in both the tests was discussed in connection with the crack opening displacement in experiments and FEM analyses. The new equivalent stress derived from the FEM analysis was proposed so as to correlate the biaxial crack propagation rate. The equivalent stress well correlated not only the crack propagation rate but also the biaxial low cycle fatigue failure data.