Abstract
The fatigue-hardening and high-cycle fatigue life of copper and the “Cu-36%Zn alloy under reversed bending at constant strain amplitudes have been investigated. By correcting nominal bending stresses the cyclic stress/strain curves, cyclic strain-hardening exponents, and fatigue ductility exponents become close to those obtained directly from axial fatigue tests. The corrected stress-amplitude/fatigue-life curves agree well with those from axial fatigue if the mode of load control, stress or strain, is also taken into account. The difference between low- and high-amplitude hardening of copper, based on hardness measurements, specimen surface conditions, dislocation structures, and S/N curve, is pointed out and briefly considered.
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