Initial Stresses and Skin Effects in a Hemitropic Cosserat Continuum

[+] Author and Article Information
Y. Weitsman

The Pennsylvania State University, University Park, Pa.

J. Appl. Mech 34(1), 160-164 (Mar 01, 1967) (5 pages) doi:10.1115/1.3607617 History: Received February 21, 1966; Revised June 07, 1966; Online September 14, 2011


In this paper, constitutive relations are derived for a linear Cosserat continuum possessing hemitropic symmetry. In such a continuum, the microstructure has a screwlike property, or handedness, and can support initial couple stresses of twist. These initial stresses serve as a model for cohesion. The introduction of free boundaries in such a medium brings about an unbalancing of the internal “cohesive” forces which results in a highly localized skin effect. This skin effect is represented by an outward, or inward, motion of a boundary layer, which is accompanied by microtwisting. A qualitative comparison is obtained with a specific solution based upon the linear elastic dislocation theory.

Copyright © 1967 by ASME
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