Some experiments on adiabatic shear failure

Abstract

Dynamic testing of statically pre-deformed specimens of Ti6A14V shows that the total strain to failure increases with the level of pre-strain. Furthermore, interrupted and various other dynamic tests on Ti6AL4V show that the temperature rise prior to localization has only a minor influence on adiabatic shear band (ASB) formation. For all the tests, the calculated dynamic deformation energy until ASB formation is found to be relatively constant. This indicates that adiabatic shear banding is dependent almost solely on dynamic deformation processes, with quasi-static and thermal effects prior to localization being very marginal. We suggest the concept of a constant dynamic mechanical energy (toughness) as a quantitative criterion for ASB formation. Physically, this concept is related to the dynamic stored energy of cold work.