Table of Contents
Indian Journal of Materials Science
Volume 2014, Article ID 253018, 15 pages
Research Article

Analysis of Free Edge Stresses in Composite Laminates Using Higher Order Theories

Concordia Center for Composites (CONCOM), Department of Mechanical and Industrial Engineering, Concordia University, 1455 De Maisonneuve Boulevard West, Montreal, QC, Canada H3G 1M8

Received 10 January 2014; Accepted 10 April 2014; Published 4 May 2014

Academic Editor: S. Raja

Copyright © 2014 Hamidreza Yazdani Sarvestani and Ali Naghashpour. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents the determination of the interlaminar stresses close to the free edges of general cross-ply composite laminates based on higher order equivalent single-layer theory (HESL). The laminates with finite dimensions were subjected to a bending moment, an axial force, and/or a torque for investigation. Full three-dimensional stresses in the interior and the boundary-layer regions were determined. The computed results were compared with those obtained from Reddy’s layerwise theory. It was found that HESL theory predicts precisely the interlaminar stresses near the free edges of laminates. Besides, high efficiency in terms of computational time is obtainable when HESL theory is used as compared with layerwise theory. Finally, various numerical results were presented for the cross-ply laminates. Also design guidelines were proposed to minimize the edge-effect problems in composite laminates.