Torsional Response of Rectangular Composite Laminates

[+] Author and Article Information
C.-L. Tsai, I. M. Daniel

Departments of Civil and Mechanical Engineering, Northwestern University, Evanston, IL 60208

G. Yaniv

Simula, Inc., Tempe, AZ

J. Appl. Mech 57(2), 383-387 (Jun 01, 1990) (5 pages) doi:10.1115/1.2892001 History: Received October 10, 1988; Revised April 01, 1989; Online March 31, 2008


The torsional response of a composite laminate of rectangular cross-section was analyzed by the Mindlin-Reissner theory. The analysis takes into account separately the shear properties of each layer. A general closed-form relationship was derived between torque and angle of twist in terms of the geometric parameters and shear properties of the laminae. In the case of unidirectional laminates, relations can be expressed involving the three principal shear moduli, G 12 , G 13 , and G 23 . An experimental method was also developed for determining these moduli by measuring surface and edge strains with strain gages. Results for a typical graphite/epoxy composite show the validity of the usual assumption of transverse isotropy.

Copyright © 1990 by The American Society of Mechanical Engineers
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