Accession Number : AD0780029

Title :   Continuous Seam Diffusion Bond Titanium Spar Evaluation.

Descriptive Note : Final rept. 20 Jun 72-20 Jan 74,


Personal Author(s) : Bonassar,Maron J. ; Lucas,John J.

Report Date : APR 1974

Pagination or Media Count : 74

Abstract : The objectives of this program were establishment of a technology to fabricate helicopter titanium main rotor blade spars cut from sheet material and joined by continuous seam diffusion bonding (CSDB) and the eventual application of this technology in the manufacturing of various components at reduced overall cost. The effects of different thermal treatments after bonding were determined by tensile and fatigue testing of small test specimens fabricated from titanium sheet flat panels joined by CSDB. Three 9-foot long spar sections were then fabricated, and two were tested in fatigue. The results indicate that continuous seam diffusion bonding has fatigue strength characteristics as good as, or better than, present fusion welded main rotor blade spar specimens and should be further evaluated for this application. (Modified author abstract)

Descriptors :   *Rotor blades(Rotary wings), *Titanium alloys, *Spars, *Diffusion bonding, Fatigue(Mechanics), Fabrication, Composite materials, Aluminum alloys, Vanadium alloys, Fiberglass, Panels, Honeycomb structures, Helicopters

Subject Categories : Helicopters
      Laminates and Composite Materials
      Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE