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RESEARCH PAPERS

A Crystallographic Model for Nickel Base Single Crystal Alloys

[+] Author and Article Information
L. T. Dame

International TechneGroup Incorporated, Milford, OH 45150

D. C. Stouffer

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

J. Appl. Mech 55(2), 325-331 (Jun 01, 1988) (7 pages) doi:10.1115/1.3173678 History: Received January 22, 1986; Revised January 20, 1988; Online July 21, 2009

Abstract

The purpose of this research is to develop a tool for the mechanical analysis of nickel-base single-crystal superalloys, specifically Rene N4, used in gas turbine engine components. This objective is achieved by developing a rate-dependent anisotropic constitutive model and implementing it in a nonlinear three-dimensional finite-element code. The constitutive model is developed from metallurgical concepts utilizing a crystallographic approach. An extension of Schmid’s law is combined with the Bodner-Partom equations to model the inelastic tension/compression asymmetry and orientation-dependence in octahedral slip. Schmid’s law is used to approximate the inelastic response of the material in cube slip. The constitutive equations model the tensile behavior, creep response and strain-rate sensitivity of the single-crystal superalloys. Methods for deriving the material constants from standard tests are also discussed. The model is implemented in a finite-element code, and the computed and experimental results are compared for several orientations and loading conditions.

Copyright © 1988 by ASME
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