Accession Number : AD0737285
Title : Ballistic Vulnerability of Boron/Epoxy Double-Wall Drive Shafts.
Descriptive Note : Final rept. Feb-Jun 71,
Corporate Author : UNITED AIRCRAFT CORP STRATFORD CONN SIKORSKY AIRCRAFT DIV
Personal Author(s) : Welge,Robert T. ; Veit,Frank H.
Report Date : OCT 1971
Pagination or Media Count : 45
Abstract : Seven boron/epoxy double-wall shafts were ballistically impacted while under torque loads ranging from 7,500 to 12,300 in.-lb. Projectile velocities ranged from 1,540 to 2,500 fps. Static residual strength tests were then conducted. Three aluminum shafts were tested similarly for comparison. The residual strength of the boron/epoxy shafts was approximately 8,000 in.-lb, which is about one-third the ultimate strength of an undamaged tube. The aluminum shafts exhibited residual strengths of 22,000 to 32,000 in.-lb, which would be sufficient to carry expected flight loads. This program has shown that plus or minus 45 boron/epoxy sandwich drive shafts exhibit much lower residual strengths after ballistic damage than do the conventional aluminum shafts, and that design improvements would be required if the boron/epoxy shafts are to be acceptable in a ballistic environment. (Author, modified-PL)
Descriptors : (*DRIVE SHAFTS, VULNERABILITY), (*COMPOSITE MATERIALS, DRIVE SHAFTS), (*AMMUNITION DAMAGE, DRIVE SHAFTS), EPOXY RESINS, BORON, SANDWICH CONSTRUCTION, HELICOPTERS, IMPACT TESTS
Subject Categories : Machinery and Tools
Distribution Statement : APPROVED FOR PUBLIC RELEASE