Yield-Point Phenomenon in Impact-Loaded 1060 Aluminum

Abstract

Experiments are described in which flat plates of 1060 aluminum were impact loaded by similar plates at velocities up to 36 m/sec. The resulting elastic and plastic wave shapes were observed after they had traveled 25 mm through the material. It was found that the stress in the so‐called elastic wave rose to a peak and then unexpectedly decreased before the following plastic wave again increased the stress toward its maximum value. The relation of the overshoot in stress to dislocation motion is discussed.