A study of material constitutive behaviour at elevated temperature from compressive SHPB test using an inverse analysis method

Abstract
In order to facilitate characterization of materials at high strain rate and high temperature, this paper introduces a technique for using the traditional Split Hopkinson Pressure Bar (SHPB) system at elevated temperature, with a different geometry for the specimen. This particular specimen is used to avoid a complicated SHPB system at an elevated temperature, and to keep things as simple as possible. The limitations of the compression SHPB in use at high temperatures, the need for extra computations and the requirement for additional equipment may be reasons why there is such a scarcity of reliable flow stress data for various materials at high temperatures in the literature. In order to identify the constitutive equation, an inverse analysis method is used from a reduced finite element simulation of the specimen compression. This simple, easy, practical experimental system and inverse analysis technique, have been used to study a AA5083 aluminium alloy at high temperature and high strain rates.