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The cyclic plastic strain ranges were determined in the surface layers (material containing persistent slip bands) and inside the specimens. In the experiments several stress amplitudes, several average grain sizes, and two environments were used. The cyclic plastic strain range inside a specimen was constant throughout the fatigue life, but in the surface layer it was high early in the life and decreased throughout the life. The largest cyclic plastic strains in the surface layer were about two orders of magnitude larger than those inside the specimen. The mechanical surface effect involved a layer of metal with a thickness of about four average grains.
fatigue (materials), copper, surface properties, cyclic loads, strain hardening, strain measurement, crack propagation, plasticity tests, crack initiation
research engineer, Kawasaki Steel Co.,
Associate professor, The University of Wisconsin, Madison, Wis.