Creep and tensile behavior
Article Abstract:
The modeling of creep and tensile behavior at high homologous temperatures uses the viscoplasticity theory based on overstress (VBO). VBO is a state variable theory independent of loading/unloading constraints and yield surface. A modification of the VBO model for low temperatures allows incorporation of the diffusion effects by adding the state terms to the growth laws. The VBO flow law represents incompressible Newtonian fluid by taking a suitable temperature variation of the material constants. Effective modeling of the primary, secondary, and tertiary creep is attained.
Publication Name: Journal of Engineering Materials and Technology
Subject: Science and technology
ISSN: 0094-4289
Year: 1995
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Characteristics of the VBO model
Article Abstract:
The properties of the high homologous temperature VBO model under extreme conditions such as very fast and very slow tensile tests, long-term-creep and relaxation tests were studied. Several numerical experiments and analyses were performed. The results provided confidence that VBO can be employed for predicting the long-term behavior at high homologous temperature once the constants have been determined from regular, short-term tests.
Publication Name: Journal of Engineering Materials and Technology
Subject: Science and technology
ISSN: 0094-4289
Year: 1997
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A simplified model
Article Abstract:
The temperature deformation behavior of Alloy 800H was modeled at homologous temperatures between 0.6 and 0.8 using a simplified type of the Viscoplasticity Theory Based on Overstress. Phenomenon such as static recovery and tertiary creep will not be represented by the model whenever any constants are omitted. Test results indicated the model's competence in simulating various types of data.
Publication Name: Journal of Engineering Materials and Technology
Subject: Science and technology
ISSN: 0094-4289
Year: 1998
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