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REVIEW ARTICLES: Viscoplasticity: Experiment and Modelling

Anisotropic Constitutive Modeling of a Single Crystal Superalloy at Elevated Temperature

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

Department of Aerospace Engineering and Engineering Mechanics, University of Cincinnati, Cincinnati, OH 45221

L. T. Dame

Structural Dynamics Research Corporation, Milford, Ohio 45150

Appl. Mech. Rev 43(5S), S345-S352 (May 01, 1990) doi:10.1115/1.3120838 History: Online April 30, 2009

Abstract

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 in the inelastic flow equation for slip in each slip system. Experiments were conducted to evaluate the need of back stress in the model. The test results showed the effect of reverse inelastic flow on unloading is orientation dependent, and that a back stress state variable in the inelastic flow equation is necessary for predicting the anelastic behavior. Model correlations and predictions with experimental data are presented for the single crystal superalloy Rene’ N4 at 760C and 982C.

Copyright © 1990 by American Society of Mechanical Engineers
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