Wpływ cyklicznej plastycznej deformacji na powierzchnię plastyczności

Initially deformed tubular brass specimens were tested under complex state of stress. Three programmes of initial prestraining were performed; tension, cyclic tension and compression under constant strain and constant stress. Maximum stresses in tension in each programme were equal. Third programme leads to the greatest strain-hardening of the material. The smallest surface of plasticity corresponds to the initial tension in spite of the fact that it leads to the greatest initial elongation of the specimen.