DYNAMIC BAUSCHINGER EFFECT

An experimental investigation of the ''Bauschinger effect'' in materia ls under dynamic loading conditions is presented. In this study, a ten sion split Hopkinson bar with a momentum trap is used to subject a ten sile specimen to a single high strain-rate tension pulse of known magn itude and duration. The uniformly deformed gauge length of the tension specimen is then sectioned and loaded in a compression split Hopkinso n bar with a momentum trap, at essentially the same strain rate as tha t of the initial tension test. Comparison is made between these high s train rate Bauschinger experiments and similar tests carried out under quasi-static conditions. Two different material microstructures were examined: solid-solution strengthened and precipitation-strengthened a lloys. The Bauschinger effect is found to be a function of the initial material microstructure as well as strain rate. Copyright (C) 1996 Ac ta Metallurgica Inc.