Deformation, temperature and strain rate sequence experiments on OFHC Cu

In this paper, we report a series of large strain deformation experiments on initially annealed oxygen-free high conductivity (OFHC) Cu involving sequences of deformation path, temperature, and strain rate (quasi-static to dynamic). Experiments were conducted to obtain a comprehensive data set for the development and evaluation of internal state variable (ISV) models and for the investigation of different functional forms for internal state variable evolution. These included: (a) constant true strain rate tests at various temperatures, (b) load-unload-hold-reload tests at several nominal temperatures, and (c) sequence tests, including strain rate changes, temperature changes and deformation path changes. OFHC Cu demonstrates sensitivity to strain rate and temperature, and exhibits significant history effects. Implications of these data are discussed for the evaluation and development of models which account for deformation path, temperature, and strain rate history effects. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.