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A crystallographic model for nickel base single crystal alloysThe 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.
Document ID
19880060955
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Dame, L. T.
(International TechneGroup, Inc. Milford, OH, United States)
Stouffer, D. C.
(Cincinnati, University OH, United States)
Date Acquired
August 13, 2013
Publication Date
June 1, 1988
Publication Information
Publication: ASME, Transactions, Journal of Applied Mechanics
Volume: 55
ISSN: 0021-8936
Subject Category
Metallic Materials
Accession Number
88A48182
Funding Number(s)
CONTRACT_GRANT: NAG3-511
Distribution Limits
Public
Copyright
Other

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