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Anisotropic constitutive modeling for nickel-base single crystal superalloysAn anisotropic constitutive model was developed based on crystallographic slip theory for nickel base single crystal superalloys. The constitutive equations developed utilizes drag stress and back stress state variables to model the local inelastic flow. Specially designed experiments were conducted to evaluate the existence of back stress in single crystal superalloy Rene N4 at 982 C. The results suggest that: (1) the back stress is orientation dependent; and (2) the back stress state variable is required for the current model to predict material anelastic recovery behavior. The model was evaluated for its predictive capability on single crystal material behavior including orientation dependent stress-strain response, tension/compression asymmetry, strain rate sensitivity, anelastic recovery behavior, cyclic hardening and softening, stress relaxation, creep and associated crystal lattice rotation. Limitation and future development needs are discussed.
Document ID
19880020577
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Sheh, Michael Y.
(Cincinnati Univ. OH, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1988
Subject Category
Metallic Materials
Report/Patent Number
NASA-CR-182157
NAS 1.26:182157
Accession Number
88N29961
Funding Number(s)
CONTRACT_GRANT: NAG3-511
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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