Strain-Rate Effects in the Propagation of Torsional Plastic Waves

[+] Author and Article Information
W. E. Baker

Department of Mechanical Engineering, University of New Mexico, Albuquerque, N. Mex.

C. H. Yew

Department of Engineering Mechanics, The University of Texas, Austin, Texas

J. Appl. Mech 33(4), 917-923 (Dec 01, 1966) (7 pages) doi:10.1115/1.3625202 History: Received July 19, 1965; Revised January 17, 1966; Online September 15, 2011


A new method was developed for determining the dynamic stress-strain relationships of materials subjected to high rate of torsional loading. In addition, an investigation of propagation of torsional plastic waves in a long tube was conducted. Commercially pure copper was used throughout both investigations. In the material property studies, shear strains up to 20 percent and shear strain rates to 2100/sec were obtained. The results indicated that copper exhibits significantly lower strain-rate effects than those previously obtained by the longitudinal loading method. In the studies of plastic wave propagation, shear strain-time records at several cross sections along the tube were compared with computed results obtained from the strain-rate-independent and strain-rate-dependent theories. It is concluded that the computed results based on the strain-rate-dependent theory give better agreement with the experiments.

Copyright © 1966 by ASME
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