A viscoplastic model for single crystals
Article Abstract:
A mathematical model to study deformation in single crystals is given. The model represents deformation in slip systems and the total deformation is determined by adding the slip on the active slip systems. The material studied is the PWA 1480 alloy from Pratt and Whitney which is in the same category as the General Electric Rene-N4 and the Canon-Muskegon CMSX-2. The model gives accurate estimates of the viscoplasticity when octahedral and cube slips are incorporated. The use of the model allows the analysis of the yield-stress symmetry which happen if inelastic strain is introduced quickly.
Publication Name: Journal of Engineering Materials and Technology
Subject: Science and technology
ISSN: 0094-4289
Year: 1992
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Gradient deformation models at nano, micro, and macro scales
Article Abstract:
Research was conducted to examine various deformation models incorporating higher-order gradients as well as their influence on several problems ranging from the determination of dislocation core size to the determination of wavelengths of dislocation and the determination of solid interface structures. The objective was to outline the simplest possible structure of gradient theory required for describing various spatial deformation features. Results demonstrate the significance of gradient terms in determining the structure of the interface and the shear band profile.
Publication Name: Journal of Engineering Materials and Technology
Subject: Science and technology
ISSN: 0094-4289
Year: 1999
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Stress versus temperature dependence of activation energies for creep
Article Abstract:
An analysis of the functional forms of the Gibbs free energy that agrees with theoretical creep data for polycrystalline Cu and Lif-22% CaF2 is given. Three formulas in which the Gibbs free energy is represented as a constant, as functions of stress and energy are analyzed. Results obtained show that the temperature-dependent Gibbs free energy agrees more with experimental data than the stress-dependent Gibbs free energy.
Publication Name: Journal of Engineering Materials and Technology
Subject: Science and technology
ISSN: 0094-4289
Year: 1992
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Comment about this article or add new information about this topic:
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