A Comprehensive Creep Model

[+] Author and Article Information
T. Z. Harmathy

Fire Research Section, Division of Building Research, National Research Council, Ottawa, Ontario, Canada

J. Basic Eng 89(3), 496-502 (Sep 01, 1967) (7 pages) doi:10.1115/1.3609648 History: Received January 30, 1967; Online November 03, 2011


Based on Dorn’s creep theory, a comprehensive creep model has been developed that is applicable to the calculation of deformation processes at steadily increasing temperatures and slowly varying load. It is shown that the entire course of the creep curve (excepting the tertiary creep) of structural (polycrystalline) materials is uniquely determined by two stress-dependent parameters, εt0 and Z. Explicit expressions for the description of creep processes are proposed. These expressions cannot strictly be regarded as equations of state, but yield an accuracy acceptable for engineering calculations even if dσ/dt ≠ 0.

Copyright © 1967 by ASME
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