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RESEARCH PAPERS

Response of Various Metals to Large Torsional Strains Over a Large Range of Strain Rates—Part 1: Ductile Metals

[+] Author and Article Information
G. R. Johnson, J. M. Hoegfeldt

Honeywell Inc., Defense Systems Division, Hopkins, Minn. 55343

U. S. Lindholm

Department of Materials Sciences, Southwest Research Institute, San Antonio, Texas 78284

A. Nagy

Southwest Research Institute, San Antonio, Texas 78284

J. Eng. Mater. Technol 105(1), 42-47 (Jan 01, 1983) (6 pages) doi:10.1115/1.3225617 History: Received July 08, 1982; Online September 15, 2009

Abstract

This paper presents torsional test results for six ductile metals subjected to large shear strains and high strain rates. Included are OFHC copper, Cartridge brass, Nickel 200, Armco IF iron, Carpenter electrical iron, and 1006 steel. Torsional shear strains as high as 700 percent are achieved and strain rates vary from quasi-static to over 300 s−1 . At the lower strain rates all of the materials exhibit positive strain hardening and strain rate hardening under essentially isothermal conditions. At the higher strain rates there is significant adiabatic thermal softening and strong evidence for shear instabilities and localizations. Constitutive relationships are derived from the test data and finite element computations of the tests are performed.

Copyright © 1983 by ASME
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