The axial–torsional cyclic deformation behavior of polycrystalline nickel was investigated by performing
fully reversed plastic strain amplitude controlled fatigue experiments at effective plastic strain amplitudes
ranging from 1×10−4 to 1×10−3. Experiments were accomplished under proportional and 90◦
out-of-phase nonproportional loading paths. Results indicate that loading path has very little effect on
the cyclic response at the lower effective plastic strain amplitude. However, at the higher effective plastic strain amplitude, significant additional hardening is induced by the nonproportional loading path.
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