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RESEARCH PAPERS

An Extended Shakedown Theory for Structures That Suffer Cyclic Thermal Loading, Part 2: Applications

[+] Author and Article Information
A. R. S. Ponter

Leicester University, Leicester LE1 7RH, England

S. Karadeniz

University of Erciyes, Kayseri, Turkey

J. Appl. Mech 52(4), 883-889 (Dec 01, 1985) (7 pages) doi:10.1115/1.3169163 History: Received September 01, 1983; Revised October 01, 1984; Online July 21, 2009

Abstract

In an accompanying paper an extended shakedown theory was described for structures subjected to constant mechanical loads and cyclically varying thermal loads, a circumstance of interest in Fast Reactor design. In this paper the upper bound theorem is used to construct interactive diagrams for a sequence of sample problems. These examples imply that for many shell problems, where the temperature variations occur along the surface, ratchetting occurs in two distinct ways. For low thermal loading the structure deforms in the same mechanism that occurs at plastic collapse when only the mechanical loads are applied. For high levels of thermal loading the mechanism changes to a local concentration of strain. This behavior differs significantly from that of the Bree problem. In one example this mechanism involves through-thickness shear deformation of a plate; as a consequence the use of thin shell theory which ignores shear deformation in numerical solutions of problems of this type is likely to result in nonconservative estimates of inelastic deformations.

Copyright © 1985 by ASME
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