A simple and accurate method for estimating the three-dimensional effective moduli of symmetric and orthotropic laminated composites is presented. The method is based on obtaining the exact displacement field of three boundary value problems of laminated composites using the Airy stress function solution technique. The effective moduli are estimated by matching the boundary displacements of the equivalent homogeneous system with those of the laminated system. Among the estimated effective moduli, those associated with the interlaminar direction are of special interest. It is found that the effective interlaminar normal stiffness in extensional deformation is independent of laminae stacking sequence which is consistent with the finding of Pagano (1974). However, the laminate interlaminar shear stiffness is dependent on stacking sequence, and it is shown that the rule of mixtures can not predict the interlaminar shear stiffness accurately.
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March 1992
Research Papers
Three-Dimensional Effective Moduli of Orthotropic and Symmetric Laminates
Ajit K. Roy,
Ajit K. Roy
University of Dayton Research Institute, Dayton, OH 45469-0168
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Stephen W. Tsai
Stephen W. Tsai
Department of Aeronautics and Astronautics, Stanford University, Stanford, CA 94305-4035
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Ajit K. Roy
University of Dayton Research Institute, Dayton, OH 45469-0168
Stephen W. Tsai
Department of Aeronautics and Astronautics, Stanford University, Stanford, CA 94305-4035
J. Appl. Mech. Mar 1992, 59(1): 39-47 (9 pages)
Published Online: March 1, 1992
Article history
Received:
October 18, 1988
Revised:
March 15, 1991
Online:
March 31, 2008
Citation
Roy, A. K., and Tsai, S. W. (March 1, 1992). "Three-Dimensional Effective Moduli of Orthotropic and Symmetric Laminates." ASME. J. Appl. Mech. March 1992; 59(1): 39–47. https://doi.org/10.1115/1.2899462
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