Accession Number:

ADA250864

Title:

Eigensensitivity Analysis of Composite Laminates: Effect of Microstructure

Descriptive Note:

Final rept. 1 Nov 1989-31 Oct 1990,

Corporate Author:

HOWARD UNIV WASHINGTON DC DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

1992-02-01

Pagination or Media Count:

77.0

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.

Subject Categories:

  • Laminates and Composite Materials
  • Theoretical Mathematics
  • Structural Engineering and Building Technology
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE