Fatigue-life relations between elastic, plastic, and total strain components were established. For metallurgically stable materials, straight-line fits of the logarithmic elastic strain-life and plastic strain-life data produce a relation that agrees well with the total strain-life data. The strain-life data are also used to explain changes in susceptibility to stress concentrations over a large life span and to rate correctly the relative notch sensitivities of the four test materials that experienced neatest-section failures in comparison with the other materials.nRelative performance of the test materials is illustrated on the basis of both strain range and stress range over a life span ranging from a few cycles to about one million cycles.
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