Accession Number : ADA192289

Title :   Elastic Wave Dispersion in Laminated Composite Plate,

Corporate Author : COLORADO UNIV AT BOULDER DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Datta, S K ; Shah, A H ; Al-Nassar, Y ; Bratton, R L

PDF Url : ADA192289

Report Date : Jul 1987

Pagination or Media Count : 8

Abstract : In this paper we use the stiffness method that was presented in to study dispersion of waves in a laminated plate. In this approach each lamina is divided into several sublayers and the displacement distribution through the thickness of each sublayer is approximated by polynomial interpolation functions in such a way that displacements and tractions are continuous across the interfaces between adjacent sublayers. Details of the method can be found in. Here we summarize the pertinent equations and discuss numerical results obtained for particular systems. This study is motivated by a desire to model wave propagation in a continuous fiber-reinforced laminated plate. If the wavelength is long compared to the fiber diameters and spacing, then each lamina can be modeled as a homogeneous transversely isotropic medium with the symmetry axis parallel to the fibers. The overall effective elastic properties of such a medium can be calculated from the fiber and matrix properties by using an effective modulus theory. Such an assumption has been made in this paper. Thus the dispersion characteristics of guided waves in a layered anisotropic plate has been studied here.

Descriptors :   *DISPERSING, *ELASTIC WAVES, *LAMINATES, *PLATES, *FIBER REINFORCED COMPOSITES, CANADA, COMPOSITE STRUCTURES, DIAMETERS, DISPLACEMENT, DISTRIBUTION, ELASTIC PROPERTIES, EQUATIONS, FIBER REINFORCEMENT, FIBERS, FUNCTIONS, INTERPOLATION, NUMERICAL ANALYSIS, POLYNOMIALS, STIFFNESS, WAVE PROPAGATION, WAVEFORMS, WAVES, STRESS STRAIN RELATIONS

Subject Categories : Laminates and Composite Materials
      Acoustics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE