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RESEARCH PAPERS

A Mechanism for Shear Band Formation in the High Strain-Rate Torsion Test

[+] Author and Article Information
Timothy J. Burns

Center for Computing and Applied Mathematics, National Institute of Standards and Technology, Gaithersburg, MD 20899

J. Appl. Mech 57(4), 836-844 (Dec 01, 1990) (9 pages) doi:10.1115/1.2897649 History: Received June 15, 1989; Revised October 23, 1989; Online March 31, 2008

Abstract

A numerical study of a one-dimensional model of the high strain-rate torsion test shows that a moving boundary of rigid unloading, starting from the ends of the thin-walled tubular specimen, is a plausible mechanism for adiabatic shear band formation during the test. Even though the dimensionless thermal diffusivity parameter is very small, the moving boundary is due to heat transfer from the specimen through its ends, which are assumed to be isothermal heat sinks. The mathematical model is based on a physical model of thermoelastic-plastic flow and a phenomenological Arrhenius model for the plastic flow surface. The numerical technique used is the semi-discretization method of lines.

Copyright © 1990 by The American Society of Mechanical Engineers
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