Creep Analysis of Beams and Arches Based on a Hereditary Visco-Elastic-Plastic Constitutive Law

[+] Author and Article Information
J. M. Stubstad, G. J. Simitses

Georgia Institute of Technology, Atlanta, Ga. 30332

J. Eng. Mater. Technol 112(2), 210-217 (Apr 01, 1990) (8 pages) doi:10.1115/1.2903309 History: Received February 01, 1989; Online April 29, 2008


An analytic study of planar beams and arches subjected to significant thermal cycling from ambient temperatures up to 800°C is presented. The study employs a recently unified nonlinear hereditary type of viscoelastoplastic constitutive law to characterize the time- and temperature-dependent properties of Hastelloy X, a typical aerospace alloy. The results demonstrate a strong interaction between the backstress variable of the constitutive law and the time-dependent stress distribution produced by the deformation. This interaction tends to control, in a highly nonlinear manner, the creep ratchetting response of the beam or arch. Moreover, temperature gradients in the thickness direction tend to exert an important influence during thermal cycling.

Copyright © 1990 by The American Society of Mechanical Engineers
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