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TECHNICAL PAPERS

The Effect of Transverse Shear on the Postbuckling and Growth Characteristics of Delaminations in Composites

[+] Author and Article Information
Catherine H. Ferrie, Izhak Sheinman, George A. Kardomateas

School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0150

J. Eng. Mater. Technol 121(4), 406-412 (Oct 01, 1999) (7 pages) doi:10.1115/1.2812395 History: Received January 21, 1999; Revised May 16, 1999; Online November 27, 2007

Abstract

A geometrically nonlinear formulation for the behavior of composite delaminated beams of arbitrary stacking sequence, and with the effects of transverse shear deformation included, is presented. The formulation is based on a first-order shear deformation kinematic model, which incorporates the bending-stretching coupling effect and also assumes an arbitrary initial imperfection. The nonlinear differential equations are solved by Newton’s method using a finite-difference scheme. The growth of the delamination is also studied by applying the J-integral in order to derive a formula for the energy release rate, which includes transverse shear. Results are presented which illustrate the shear effect, especially with respect to the ratio of the in-plane extensional over shear modulus and with respect to the ratio of plate length over thickness. It is seen that transverse shear can affect largely the displacement profiles, rendering the structure more compliant, and can promote growth by increasing the energy release rate, but this latter effect is moderate and mainly noticable only at the later stages in the postbuckling regime.

Copyright © 1999 by The American Society of Mechanical Engineers
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