THE NATURE OF DYNAMIC RELAXATION OF MATERIAL UNDER HIGH-SPEED DEFORMATION AND THE PLASTIC WAVE IN A ONE-DIMENSIONAL BAR.
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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It would be of interest to know whether the process in a material under impact deformation can be described by a single equation of state. In the present paper it is assumed that the state equation reflects the mechanical laws of impact deformation only in part of the lagrangian x-t plane. The paper considers the properties of the functionalpha, epsilon in impact deformation and the form Radial inertia is treated as at least one of the causes for the increase in stress in the equation of state. The uniform-strain region is explained in terms of the strain-rate-dependent theory. Up to impact velocities of several tens of meters per second, friction between the sections under impact has a considerable influence on the formation and propagation of plastic waves. However, this effect is negligible when the velocity exceeds 100 msec. Experimental data are derived from combined analyses of high-speed deformation of short chrome-steel test projectiles and 2S aluminum bars. Author