Modeling of High Homologous Temperature Deformation Behavior Using the Viscoplasticity Theory Based on Overstress (VBO): Part II—Characteristics of the VBO Model

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

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

J. Eng. Mater. Technol 119(1), 1-6 (Jan 01, 1997) (6 pages) doi:10.1115/1.2805967 History: Received April 06, 1996; Revised July 21, 1996; Online December 05, 2007


Characteristics 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 are investigated via numerical experiments and analysis. To this end, material constants of Alloy 800H determined from other tests in Part I were utilized for the prediction. Although no experiments are available for the extreme conditions, the predictions are plausible. For cyclic, strain controlled hold-time tests the predictions compare well with sparse experimental data. The results give confidence that VBO can be used to predict the long-term behavior at high homologous temperature once the constants have been determined from regular, short-term tests.

Copyright © 1997 by The American Society of Mechanical Engineers
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