Elastodynamic Response of a Unidirectional Composite Laminate to Concentrated Surface Loads: Part II

[+] Author and Article Information
Shyh-shiuh Lih, Ajit K. Mal

Department of Mechanical, Aerospace and Nuclear Engineering, University of California, Los Angeles, CA 90024

J. Appl. Mech 59(4), 887-892 (Dec 01, 1992) (6 pages) doi:10.1115/1.2894057 History: Received February 12, 1990; Revised July 11, 1991; Online March 31, 2008


The quantitative features of the elastodynamic field produced in a unidirectional graphite/epoxy composite laminate by surface loads are studied. The material of the composite is modeled as a transversely isotropic dissipative medium with its symmetry axis parallel to the laminate surface. The surface displacement produced by a transient concentrated point load on the surface of a uniform half-space and a plate of finite thickness is calculated by means of a multiple transform technique followed by inversion through numerical integration. The two-dimensional (plane-strain) line load problems for the plate are also solved as special cases. In addition, an approximate solution based on the classical plate bending theory which includes transverse shear and rotary inertia is obtained and the range of validity of the approximate solution is determined through comparison with the exact results. The multiple transform technique is shown to be a viable alternative to finite element and other numerically intensive computational schemes for wavefield calculations in composite laminates. The mathematical formulation of the problem was described in Part I of the paper, numerical treatment and results are presented in this part.

Copyright © 1992 by The American Society of Mechanical Engineers
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