Modeling of Ratchetting in Biaxial Experiments

[+] Author and Article Information
C. Guionnet

Commissariat à I’Energie Atomique (CEA), Centre d’Etudes Nucléaires de Saclay, IRDI/DEDR/DEMT/SMT, 91191 Gif sur Yvette Cedex, France

J. Eng. Mater. Technol 114(1), 56-62 (Jan 01, 1992) (7 pages) doi:10.1115/1.2904141 History: Received May 01, 1990; Revised January 10, 1991; Online April 29, 2008


A new unified viscoplastic constitutive equation has been developed for interpreting ratchetting experiments. The model is based essentially on a generalized Armstrong-Frederick equation for the kinematic variable; the coefficient of the dynamic recovery term in this equation is a function of both instantaneous and accumulated inelastic strain which is allowed to vary in an appropriate manner in order to reproduce the experimental ratchetting rate. The validity of the model is verified by comparing predictions with experimental results for austenitic stainless steel (17-12 SPH) tubular specimens subjected to cyclic torsional loading under constant tensile stress at 600°C.

Copyright © 1992 by The American Society of Mechanical Engineers
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