Nonlinear Response of Resin Matrix Laminates Using Endochronic Theory

[+] Author and Article Information
S. R. Mathison

Honda Motor Company, Ltd., Tokyo, Japan

M. J. Pindera, C. T. Herakovich

University of Virginia, Charlottesville, VA

J. Eng. Mater. Technol 113(4), 449-455 (Oct 01, 1991) (7 pages) doi:10.1115/1.2904125 History: Received November 20, 1990; Online April 29, 2008


The nonlinear response of laminated, resin matrix fibrous composites is modeled using orthotropic endochronic theory. The theory is formulated in terms of elastic constants and endochronic parameters characterizing the linear and nonlinear response, respectively, of unidirectional composites. All constants and parameters can be determined from normal (tension and/or compression) and shear tests on unidirectional and off-axis specimens. The nonlinear constitutive response relations for the unidirectional lamina are presented and the procedure for determining constants and parameters from test is described. The results are then used to predict the nonlinear response of unidirectional laminae and angle-ply laminates. Comparison between theory and experiment for compression loading of AS4/3502 graphite-epoxy, angle-ply laminates shows excellent correlation.

Copyright © 1991 by The American Society of Mechanical Engineers
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