Steady State Axisymmetric Deformations of a Thermoviscoplastic Rod Striking a Hemispherical Rigid Cavity

摘要

Steady state thermomechanical deformations of a semi-infinite rod moving at a very high speed and hitting a rigid hemispherical cavity are studied. It is assumed that the deformations of the rod are axisymmetric, that its material can be modeled as rigid-viscoplastic, that the material exhibits work-hardening, strain-rate hardening and thermal softening effects, and that the contact between the deforming rod and the cavity surface is smooth. It is found that the axial force experienced by the rod depends strongly upon its speed. An effort has been made to identify the effect of work hardening, strain-rate hardening and thermal softening on the deformations of the rod. Results computed and presented graphically include the distribution of the velocity field, the temperature change, the second-invariant of the strain-rate tensor and the principal stresses in the deforming region. Also plotted are the normal tractions on the cavity wall. Keywords: Steady state penetration; Axisymmetric deformations; Thermoviscoplastic penetrator; Rigid target; Hemispherical cavity; Reprints. (JHD)