Constraint to Side Flow in Plates

[+] Author and Article Information
J. Liss, W. Goldsmith, F. E. Hauser

Department of Mechanical Engineering, University of California, Berkeley, Calif. 94720

J. Appl. Mech 50(3), 694-698 (Sep 01, 1983) (5 pages) doi:10.1115/1.3167119 History: Received January 01, 1983; Revised April 01, 1983; Online July 21, 2009


An experimental program was conducted to determine the increase in flow stress relative to simple uniaxial compression for 2024-0 aluminum plates subjected to symmetric quasistatic compression by steel punches and to dynamic compression using the Kolsky (split Hopkinson-bar) technique. An average constraint factor of 2 was determined experimentally for a ratio of specimen thickness to bar diameter of 0.5 for the quasi-static case. This correlated well with the value predicted theoretically. Under dynamic conditions the constraint factor at yield stress was found to be slightly lower at a value of 1.75 and appeared to be nearly independent of strain rate over the test range from 103 to 1.5 × 104 s−1 .

Copyright © 1983 by ASME
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