SEDL / STP / STP770-EB / STP32443S

Multiaxial Nonproportional Cyclic Deformation

McDowell, DL
Graduate Research Assistant and Assistant Professor, University of Illinois, Urbana, Ill.

Socie, DF
Graduate Research Assistant and Assistant Professor, University of Illinois, Urbana, Ill.

Lamba, HS
Scientist, International Harvester Company, Hinsdale, Ill.

Pages: 19    Published: Jan 1982

Download this paper for $25 PDF (228K)          View License Agreement
Abstract

A model employing a modified Mroz kinematic hardening rule with a Tresca yield surface is derived for a state of plane stress, combining together successful attributes of previous nonproportional incremental plasticity theories. Results from several nonproportional tests on oxygen-free high-conductivity copper are compared with computer predictions. Solution sensitivity to the particular cyclic stress-stain curve used, its piecewise linearization for the Mroz-type hardening rule, and the magnitude of the effective strain increment in the analysis is studied. A trade-off between the number of surfaces used in the Mroz-type rule and the effective strain increment size is observed for optimum solution with respect to convergence and speed.