Accession Number:

ADA164183

Title:

Detection and Location of Ballistic Damage in Composite Materials Using Acoustic Emission Methods

Descriptive Note:

Final rept. Sep 1984-Oct 1985

Corporate Author:

UNITED TECHNOLOGIES RESEARCH CENTER EAST HARTFORD CT

Report Date:

1985-12-01

Pagination or Media Count:

75.0

Abstract:

A method for increasing survivability is described whereby the acoustic emissions generated by ballistic impacts on composite helicopter structural components are recorded and analyzed using a preliminary digital transient data recording test system, the Digital Acoustic Emission System DAES and lightweight sensors utilizing polyvinylidene fluoride PVDF film. A total of 77 ballistic impacts on six composite test segments using a variety of fragment simulating projectiles FSP with different muzzle velocities and impact energies is described. The results verify the capability of the measurement system to detect, locate, and analyze the severity of ballistic impacts. The ratio of the peak RMS value of the output signal from two sensors is shown to be a good indicator of impact energy absorption, or damage severity. Calculated hit locations are found with a mean error of seven percent of the sensor array edge distance.

Subject Categories:

  • Helicopters
  • Acoustic Detection and Detectors
  • Ballistics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE