Accession Number:

AD0737285

Title:

Ballistic Vulnerability of Boron/Epoxy Double-Wall Drive Shafts

Descriptive Note:

Final rept. Feb-Jun 1971

Corporate Author:

UNITED TECHNOLOGIES CORP STRATFORD CT SIKORSKY AIRCRAFT DIV

Personal Author(s):

Report Date:

1971-10-01

Pagination or Media Count:

45.0

Abstract:

Seven boronepoxy 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 boronepoxy 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 boronepoxy 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 boronepoxy shafts are to be acceptable in a ballistic environment.

Subject Categories:

  • Machinery and Tools
  • Armor

Distribution Statement:

APPROVED FOR PUBLIC RELEASE