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A multiaxial fatigue criterion for metals subjected to random loading ispresented. Accordingly, the orientation of the critical plane, where fatigue life estimation iscarried out, is determined from the weighted mean position of the principal stressdirections; a nonlinear combination of stress components acting on the critical plane isused to define an equivalent normal stress. A specific cyclic counting method and a generaldamage model are employed to process such an equivalent stress and to determine fatigueendurance. Finally, an application of the criterion to some relevant random fatigue tests(proportional bending and torsion) is presented.