Modeling of High Homologous Temperature Deformation Behavior Using the Viscoplasticity Theory Based on Overstress (VBO): Part I— Creep and Tensile Behavior

[+] Author and Article Information
Yukio Tachibana, Erhard Krempl

Mechanics of Materials Laboratory, Rensselaer Polytechnic Institute, Troy, NY 12180-3590

J. Eng. Mater. Technol 117(4), 456-461 (Oct 01, 1995) (6 pages) doi:10.1115/1.2804739 History: Received June 18, 1995; Online November 27, 2007


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.

Copyright © 1995 by The American Society of Mechanical Engineers
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