Eigensensitivity Analysis of Composite Laminates: Effect of Microstructure

Abstract

The purpose of this research is to develop new methods to determine how the frequency of laminates depends upon the microstructure of each individual layer. Toward this end, modern methods of sensitivity analysis are employed to develop new closed-form representations for the frequency response of laminates, where the governing eigenvalue equation is represented either in distributed parameter or discrete form. Solutions are obtained for both damped and undamped structures in terms of the aggregate micromechanical properties (stiffnesses and damping coefficients). Thus the solutions are valid for all macromechanical models of the microstructure. One new method for determining the effective stiffness and mass properties of the laminate - the Load Correction Method - is developed in detail and some of the computational issues associated with this method are discussed.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1992
Accession Number
ADA250864

Entities

People

  • Robert Reiss
  • Taft H. Broome

Organizations

  • Howard University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Composite Materials
  • Continuum Mechanics
  • Crystal Lattices
  • Differential Equations
  • Eigenvalues
  • Elastic Properties
  • Equations
  • Frequency
  • Laminates
  • Materials
  • Mechanical Engineering
  • Mechanical Properties
  • Mechanics
  • Modal Analysis
  • Modulus Of Elasticity
  • Resonant Frequency
  • Two Dimensional

Readers

  • Reinforced Composite Materials
  • Structural Dynamics.