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Anisotropic Symmetries of Linear Elasticity

[+] Author and Article Information
S. C. Cowin

Department of Mechanical Engineering, City College, City University of New York, New York, NY 10031

M. M. Mehrabadi

Department of Mechanical Engineering, Tulane University, New Orleans, LA 70118

Appl. Mech. Rev 48(5), 247-285 (May 01, 1995) (39 pages) doi:10.1115/1.3005102 History: Online April 29, 2009

Abstract

The objective of this paper is to present a development of the anisotropic symmetries of linear elasticity theory based on the use of a single symmetry element, the plane of mirror symmetry. In this presentation the thirteen distinct planes of mirror symmetry are catalogued. Traditional presentations of the anisotropic elastic symmetries involve all the crystallographic symmetry elements which include the center of symmetry, the n-fold rotation axis and the n-fold inversion axis as well as the plane of mirror symmetry. It is shown that the crystal system symmetry groups, as opposed to the crystal class symmetry groups, of the elastic crystallographic symmetries can be generated by the appropriate combinations of the orthogonal transformations corresponding to each of the thirteen distinct planes of mirror symmetry. It is also shown that the restrictions on the elastic coefficients appearing in Hooke’s law follow in a simple and straightforward fashion from orthogonal transformations based on a small subset of the small catalogue of planes of mirror symmetry.

Copyright © 1995 by The American Society of Mechanical Engineers
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