Experimental investigation of the multiaxial fatigue strength of ductile cast iron

The paper presents new experimental multiaxial fatigue data on cast iron. Several sets of specimens, taken from a real large component, have been tested under uniaxial and biaxial, tensile and torsional loading; in-phase and out-of-phase combined loadings have also been considered. The obtained results have been compared with similar experimental data taken from the literature, and the tested material has shown high sensibility to the mean value of shear stress under torsional loading, as well as dependence on the mean value of tensile stress under tensile loading. The most suitable fatigue criterion should be related to the larger principal stress variation. The materials show an unusual sensibility to the out-phase loading