Abstract
We present the results obtained for 2017(A) aluminum alloy under the conditions of pure bending with constant amplitude, pure torsion, and two combinations of proportional bending with torsion. All results can be described by a single criterion based on the parameter of strain-energy density in the critical plane. The critical plane is defined as the plane where the parameter attains its maximum value. The fatigue life is affected by the sum of the densities of normal and shear strain energies in the accepted critical plane. The results are presented in a scatter band with coefficient equal to three for the case of pure bending.
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