When more than one variable has an effect on fatigue life, a test with a suitably designed specimen can discriminate between theories of interaction as to their correctness. A small number of tests can determine the interaction coefficient. This paper discusses the application of such specimens to discriminate between three theories for out-of-phase torsion and bending. It also shows applications of such specimens to determine the increase of bending fatigue strength by peening, to determine the mean stress effect on bending fatigue, and to discriminate between the maximum shear stress and the octahedral shear stress as criteria for in-phase bending and torsion. The advantages of discriminating specimens are explained.
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Henry O. Fuchs (1979) studied this question.
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