Adhesive Bonded Doubler for H-3 Helicopter Blade Spar
Abstract
The effectiveness and reliability of an adhesive bonded boubler in the elimination of crack formation and growth due to stress concentration in a metallic substructure is demonstrated. Quantitative design information to enable optimization of the doubler is developed and the methods for the field application of doublers to the H-3 spar are described. A preliminary mechanical and thermal stress analysis has shown that a boron/epoxy laminate should provide the lightest weight, thinnest, and most reliable double compared to any other available material, except perhaps beryllium sheet material. The mechanical and thermal loads induced in the doubler and the adhesive bond under the most severe conditions, operating at -65 F, are 44,500 psi compression and 1050 psi shear respectively.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1971
- Accession Number
- AD0882745
Entities
People
- Theodore J. Reinhart Jr.
Organizations
- Air Force Research Laboratory