RESEARCH PAPERS: Additional Research Papers

Viscoplastic Behavior and Modelization of an Austenitic Stainless Steel (17-12 SPH) at High Temperature (T = 600°C), Under In and Out of Phase Cyclic Tension-Torsion Loading

[+] Author and Article Information
P. Delobelle, R. Lachat

Laboratoire de Mécanique Appliquée, Faculté des Sciences et des Techniques, Besancon Cedex, France

J. Eng. Mater. Technol 115(1), 68-76 (Jan 01, 1993) (9 pages) doi:10.1115/1.2902159 History: Received November 29, 1990; Revised July 20, 1992; Online April 29, 2008


The results of experiments performed on an austenitic stainless steel of the type 316L at a temperature of 600°C are presented. The tests were made under both unidirectional (1D) and bidimensional (2D) cyclic tension-torsion loading, both in and out of phase with one (case of 2D ratchet) or two cyclic components. For the 2D loadings, it is shown that a weak supplementary hardening ΔH+ appears which is mostly a function of the degree of phase difference φ between the strain components and the ratio R between the maximum amplitudes of these components. These observations conform qualitatively to those already reported for ambient temperature but quantitatively it is shown that the maximum amplitude of this supplementary hardening is a strongly decreasing function of the temperature. A simple phenomenological formulation is proposed which, when integrated into a unified viscoplastic model developed elsewhere, leads to a correct representation of the experimental results.

Copyright © 1993 by The American Society of Mechanical Engineers
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