Abstract
The supporting evidence for surface layer control of cyclic hardening has been examined and found to critically depend upon an assessment of the stress to initiate plastic flow after a cycling and surface removal procedure. Experiments on copper single and polycrystalline specimens have shown that the stress/strain relations determined after this procedure were slightly non-linear in the nominally elastic range as were the stress/strain relations after cyclic hardening followed by unloading with an immediate reload. On the basis of this evidence, and other metallographic evidence in the literature which indicates the existence of interior deformation bands in a cyclically hardened matrix, it is concluded that cyclic hardening occurs in the bulk and not just at the surface.
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