Nonlinear Response of Graphite-Epoxy Wide Columns Subject to Eccentric Load

[+] Author and Article Information
O. Hayden Griffin, Eric R. Johnson

Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0219

Mark D. Sensmeier

Engineer-Materials Behavior, GE Aircraft Engines, Cincinnati, 0H 45215-6301

J. Appl. Mech 60(1), 101-108 (Mar 01, 1993) (8 pages) doi:10.1115/1.2900731 History: Received May 14, 1990; Revised October 04, 1991; Online March 31, 2008


It is shown that including the effects of bend-twist coupling and material nonlinearity on the large displacement flexural response of graphite-epoxy wide columns is necessary to adequately model their response. Results from static tests on [030 ]T and [(30/0/-30)5 ]s laminated specimens under eccentric axial compression are compared to a nonlinear analysis. The analysis is based on a Kantrovich expansion of the displacements in the width coordinate and a finite element representation in the axial coordinate. An incremental, updated Lagrangian formulation and element corotational coordinates are employed. Nonlinear elastic material behavior was measured in a separate set of material characterization tests, and these data are used to compute tangent stiffnesses in the updated configuration.

Copyright © 1993 by The American Society of Mechanical Engineers
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