Accession Number:

ADA109377

Title:

Development of Manufacturing Technology for Fabrication of a Composite Helicopter Main Rotor Spar by Tubular Braiding

Descriptive Note:

Final rept. Sep 78-Sep 80

Corporate Author:

KAMAN AEROSPACE CORP BLOOMFIELD CT

Personal Author(s):

Report Date:

1981-04-01

Pagination or Media Count:

81.0

Abstract:

Mechanical tubular braiding has been shown to be a viable blade spar manufacturing process in a program which included preliminary design of an improved main rotor blade for the OH-58 helicopter. The blade incorporates an advanced aerodynamic shape and has as its primary structural member a Kevlar 49 epoxy spar fabricated by braiding. Achievement of an analytically acceptable blade and spar design meeting critical structural and dynamic requirements was not hindered by braiding process constraints. Mechanical property tests of flat panels and spar sections exhibited excellent correlation with analytical predictions, substantiating the applicability of normal composite laminate analysis methods and the validity of the specific design. Ballistic testing of spar sections demonstrated superior containment of structural damage compared to composite spars produced by more conventional methods. Manufacturing cost estimates predict a price reduction of 13 for the braided spar relative to a similar S-glassepoxy spar for an OH-58 blade of identical external shape fabricated by orthodox, low-cost technology. Author

Subject Categories:

  • Helicopters
  • Laminates and Composite Materials
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE