Vol. 3, No. 1, 2008

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ISSN: 1559-3959
Flexure of beams with an interlayer: symmetric beams with orthotropic adherends

K. S. Alfredsson, T. A. Bogetti, L. A. Carlsson, J. W. Gillespie, Jr. and A. Yiournas

Vol. 3 (2008), No. 1, 45–62
Abstract

Analysis of the three-point flexure loading of a symmetric beam configuration consisting of two identical adherends joined by a flexible layer is presented. A closed-form solution is presented in the form of a layer-wise approach, and shows excellent agreement with finite element results. Particular emphasis is given to the global beam compliance. The results show that a thin, shear deformable layer may effectively decouple the responses of the two beams. Furthermore, in contrast to ordinary beams, the presence of an overhang reduces the beam compliance. These effects are quantified and discussed. Experiments on aluminum adherends joined by a rubber layer were conducted over a range of overhang lengths in a three-point flexure fixture, and very good agreement between measured and predicted beam compliance was noted.

Keywords
flexure, interlayer, shear deformation
Milestones
Received: 24 October 2006
Accepted: 7 May 2007
Published: 11 March 2008
Authors
K. S. Alfredsson
University of Skövde
S-541 28 Skövde
Sweden
T. A. Bogetti
Army Research Laboratory
Aberdeen Proving Ground
Aberdeen, MD 21005
United States
L. A. Carlsson
Department of Mechanical Engineering
Florida Atlantic University
Boca Raton, FL 33431
United States
J. W. Gillespie, Jr.
Center for Composite Materials
University of Delaware
Newark, DE 19716
United States
A. Yiournas
Dynamic Science Inc. DTSD
Aberdeen, MD 21001
United States