The deformation of metal single crystals by alternating tension and compression

Abstract

The initial aim of the experiments, suggested "by Dr. M.S. Paterson, was to study the influence of plastic strain amplitude on the work-hardening of copper crystals of various orientations under alternating tension and compression. Dr. Paterson had shown in previous work that the "behaviour of copper crystals under alternating straining was dependent on orientation, "but the influence of strain amplitude had not "been explored and very little work of this nature had "been published "by others. The study of work-hardening under alternating straining is essential for the eventual understanding of fatigue processes, although the higher strain amplitudes used in the present work may still "be too large to "be directly relevant to practical fatigue problems. Such studies should also contribute to the general knowledge of plastic deformation, especially in relation to current theories of v/ork-hardening, since the hardening is being produced under conditions different from usual, and, in particular, the orientations of crystals do not change progressively during deformation. Reversed straining was done at constant plastic strain amplitude, since this was considered to make the interpretation of the results simpler than in the case of constant stress amplitude. (First paragraph of general introduction). Show more