An Experimental Study of the Structure of Constitutive Equations for Nonproportional Cyclic Plasticity

[+] Author and Article Information
D. L. McDowell

School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Ga. 30332

J. Eng. Mater. Technol 107(4), 307-315 (Oct 01, 1985) (9 pages) doi:10.1115/1.3225824 History: Received August 13, 1984; Online September 15, 2009


Three type 304 stainless steel specimens of the same geometry were subjected to complex, cyclic axial-torsional histories characterized by varying degrees of non-proportionality of straining. All tests were at room-temperature. The data from cyclically stable hysteresis loops were reduced and the direction of the plastic strain rate vector, variation of plastic hardening modulus, and direction of translation of a rate and time-independent yield surface were studied. It is shown that the independent variables in a Mroz-type formulation map the experimental results with a higher degree of uniqueness than other popular formulations studied for both the hardening modulus and direction of yield surface translation. Also, the plastic strain rate is not, in general, in the direction of the deviatoric stress or stress rate.

Copyright © 1985 by ASME
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