A Crystallographic Model for the Tensile and Fatigue Response for René N4 at 982°C

[+] Author and Article Information
M. Y. Sheh, D. C. Stouffer

Department of Aerospace Engineering and Engineering Mechanics, University of Cincinnati, Cincinnati, Oh 45221-0070

J. Appl. Mech 57(1), 25-31 (Mar 01, 1990) (7 pages) doi:10.1115/1.2888319 History: Received August 16, 1988; Revised April 24, 1989; Online March 31, 2008


An anisotropic constitutive model based on crystallographic slip theory was formulated for nickel-base single crystal superalloys. The current equations include both drag stress and back stress state variables to model the local inelastic flow. Specially designed experiments have been conducted to evaluate the existence of back stress in single crystals. The results showed that the back stress effect of reverse inelastic flow on the unloading stress is orientation dependent, and a back stress state variable in the inelastic flow equation is necessary for predicting anelastic behavior. Model correlations and predictions of experimental data are presented for the single crystal supperalloy René N4 at 982°C.

Copyright © 1990 by The American Society of Mechanical Engineers
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