The viscoplasticity theory based on overstress (VBO) is a state variable theory without a yield surface and without loading/unloading conditions. It contains two tensor valued state variables, the equilibrium (back) stress and the kinematic stress that is a repository for work hardening (softening). The scalar valued isotropic or time (rate)-independent stress models cyclic hardening (softening). For application to high homologous temperature, the effects of diffusion which counteracts the hardening of inelastic deformation has to be accounted for. Recovery of state terms are introduced in the growth laws for the state variables. A high homologous temperature VBO model is introduced and applied to the creep and tensile tests of Alloy 800 H between 750°C and 1050°C. Primary, secondary and tertiary creep as well as tensile behavior were well reproduced. It is shown that the transition to fluid state can be modeled with VBO.
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October 1995
Technical Papers
Modeling of High Homologous Temperature Deformation Behavior Using the Viscoplasticity Theory Based on Overstress (VBO): Part I— Creep and Tensile Behavior
Yukio Tachibana,
Yukio Tachibana
Mechanics of Materials Laboratory, Rensselaer Polytechnic Institute, Troy, NY 12180-3590
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Erhard Krempl
Erhard Krempl
Mechanics of Materials Laboratory, Rensselaer Polytechnic Institute, Troy, NY 12180-3590
Search for other works by this author on:
Yukio Tachibana
Mechanics of Materials Laboratory, Rensselaer Polytechnic Institute, Troy, NY 12180-3590
Erhard Krempl
Mechanics of Materials Laboratory, Rensselaer Polytechnic Institute, Troy, NY 12180-3590
J. Eng. Mater. Technol. Oct 1995, 117(4): 456-461 (6 pages)
Published Online: October 1, 1995
Article history
Received:
June 18, 1995
Online:
November 27, 2007
Citation
Tachibana, Y., and Krempl, E. (October 1, 1995). "Modeling of High Homologous Temperature Deformation Behavior Using the Viscoplasticity Theory Based on Overstress (VBO): Part I— Creep and Tensile Behavior." ASME. J. Eng. Mater. Technol. October 1995; 117(4): 456–461. https://doi.org/10.1115/1.2804739
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