0
RESEARCH PAPERS

Constitutive Equations for Large Plastic Deformation of Metals

[+] Author and Article Information
C. S. Hartley

College of Engineering, Louisiana State University, Baton Rouge, La. 70803

R. Srinivasan

Department of Materials Science and Engineering, SUNY-Stony Brook, Stony Brook, N.Y. 11794

J. Eng. Mater. Technol 105(3), 162-167 (Jul 01, 1983) (6 pages) doi:10.1115/1.3225636 History: Received March 19, 1983; Online September 23, 2009

Abstract

Calculations of deformation behavior in metal forming operations require constitutive equations valid at large plastic strain. This work examines the quality of fit provided by two types of equations, an exponential form which generalizes power laws and a saturation-type relation, to data produced by isothermal, uniaxial testing of annealed 304 stainless steel and Zircaloy-4 at a constant total true strain rate and various temperatures. The use of annealed material reduces the number of independent parameters to three in the exponential equation and to four in the saturation-type equation. Physical reasoning places limits on the values of some parameters and identifies two with the true stress, σm , and true strain, εm , at the maximum load sustained by the specimen. Least-square fits of the data reveal that the Voce form of the saturation-type equation exhibits the lowest standard deviation of all equations studied. Material parameters representing σm , εm , and σs , the saturation stress, generally followed expected trends for the temperature dependence of measures of strength and ductility, except that εm , of 304 stainless steel tended to decrease with increasing temperature.

Copyright © 1983 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In