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RESEARCH PAPERS

The Complementary Energy Theorem in Finite Elasticity

[+] Author and Article Information
Mark Levinson

Mechanical Engineering Department, Clarkson College of Technology, Potsdam, N. Y.

J. Appl. Mech 32(4), 826-828 (Dec 01, 1965) (3 pages) doi:10.1115/1.3627322 History: Received December 08, 1964; Revised April 28, 1965; Online September 15, 2011

Abstract

Other investigators have extended the complementary energy theorem (Castigliano’s theorem) to cover the finite deformation of elastic systems with a finite number of degrees of freedom (structures) and they then have indicated that the extension of the theorem to cover the finite deformation of an elastic continuum involved certain unstated difficulties. The present paper shows that when the strain tensor and Trefftz stress tensor, the usual choice of conjugate deformation and stress tensors, are chosen to characterize the finite deformation of an elastic continuum, one cannot establish a strict complementary energy theorem. It is then shown that a strict complementary energy theorem for the finite deformation of an elastic continuum can be established if what Fritz John calls the Lagrange strain and Lagrange stress tensors are used as the conjugate deformation and stress tensors characterizing the deformation.

Copyright © 1965 by ASME
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