DEVELOPMENT OF A ONE-DIMENSIONAL CONSTITUTIVE EQUATION FOR METALS SUBJECTED TO HIGH-STRAIN RATE AND LARGE-STRAIN

This paper outlines a simple technique to establish rate dependent str ess-strain properties for metallic materials. The materials considered are commercially pure copper and mild steel. The deformation of mater ials at high strain rate leads to the conversion of mechanical energy into heat. The temperature rise produced during these processes can be significant and can lead to phase transformation. A combined experime ntal and numerical technique has been used to establish the one-dimens ional constitutive equation, which takes account of the effects of str ain, strain hardening, strain rate, inertia, and temperature.