Free Edge Strain Concentrations in Real Composite Laminates: Experimental-Theoretical Correlation

[+] Author and Article Information
C. T. Herakovich, D. Post, M. B. Buczek, R. Czarnek

Department of Engineering Science and Mechanics, Virginia Polytechnic Institute & State University, Blacksburg, Va. 24061

J. Appl. Mech 52(4), 787-793 (Dec 01, 1985) (7 pages) doi:10.1115/1.3169147 History: Received June 01, 1984; Revised January 01, 1985; Online July 21, 2009


The magnitude of the maximum shear strain at the free edge of axially loaded [θ2 /–θ2 ]s and [(± θ)2 ]s composite laminates was investigated experimentally and numerically to ascertain the actual value of strain concentration in resin matrix laminates and to determine the accuracy of finite element results. Experimental results using moiré interferometry show large, but finite, shear strain concentrations at the free edge of graphite-epoxy and graphite-polyimide laminates. Comparison of the experimental results with those obtained using several different finite element representations showed that a four-node isoparametric finite element provided the best and most trouble-free numerical results. The results indicate that the ratio of maximum shear strain at the free edge to applied axial strain varies with fiber orientation and does not exceed nine for the most critical angle which is 15 deg.

Copyright © 1985 by ASME
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