Accession Number:

ADA279566

Title:

Flutter of Laminated Plates in Supersonic Flow

Descriptive Note:

Technical memo.

Corporate Author:

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CENTER

Personal Author(s):

Report Date:

1975-11-01

Pagination or Media Count:

129.0

Abstract:

A solution procedure has been developed using linear small deflection theory for the flutter of simply supported laminated plates. For such plates, the bending and extensional governing equations are coupled and have cross-stiffness terms which do not appear in classical plate theory. An extended Galerkin method is used to obtain approximate solutions to the governing equations, and the aerodynamic pressure loading used in the analysis is that given by linear piston theory with flow at arbitrary cross-flow angle. A limited parametric study has been conducted for typical laminated composite plates. The calculations show that both the bending-extensional coupling and the cross- stiffness terms have a large destabilizing effect on flutter. Since classical plate theory does not consider bending-extensional coupling and cross stiffness terms, it usually gives inaccurate and nonconservative flutter boundaries for laminated plates.

Subject Categories:

  • Laminates and Composite Materials
  • Structural Engineering and Building Technology
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE