Accession Number:

ADA229318

Title:

Static and Dynamic Properties of Composite Blades with Structural Couplings

Descriptive Note:

Final rept. 1 Feb 1987-30 Jun 1990,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE TECHNOLOGY LAB FOR ADVANCED COMPOSITES

Personal Author(s):

Report Date:

1990-08-27

Pagination or Media Count:

9.0

Abstract:

The present report briefly summarizes research to study analytically and experimentally, the static and dynamic behavior of helicopter rotor blades made of composite materials. A new analytic model was developed for handling arbitrarily large deflections of composite blades based on an Euler angle representation. Results for both large static deflections and small amplitude vibrations about the large static deflections, agreed well with experimental results from a series of structurally coupled composite blade models constructed to verify the analysis. The analytical model was later extended to include large amplitude, nonlinear vibrations about the large static positions. It was found that both static deflections and large amplitudes influenced greatly the fore- and-aft lead -lag and torsion modes, but had little effect on the bending modes. js

Subject Categories:

  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE