Plastic Waves of Combined Stresses Due to Longitudinal Impact of a Pretorqued Tube—Part 2: Comparison of Theory With Experiment

[+] Author and Article Information
J. Lipkin

Sandia Laboratories, Albuquerque, N. Mex.

R. J. Clifton

Brown University, Providence, R. I.

J. Appl. Mech 37(4), 1113-1120 (Dec 01, 1970) (8 pages) doi:10.1115/1.3408667 History: Received November 12, 1969; Revised March 20, 1970; Online July 12, 2010


The strain-time profiles of the experiments described in Part 1 are compared with numerical solutions based on a rate-independent theory for an isotropic work-hardening, elastic-plastic material. As discussed in Part 1, complete agreement between theory and experiment is not possible because the constant state regions predicted by the theory are not observed. In addition, the calculations lead to a final state of shear strain that is considerably greater than the measured value. Also, the magnitude of the observed jump in strain rate at an unloading wave does not agree with the theoretical predictions. The absence of constant state regions and the discrepancy in the jump at unloading waves are shown to be explainable in terms of the inadequacy of the assumption of strain rate-independent material behavior.

Copyright © 1970 by ASME
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