Accession Number:

AD0749389

Title:

Reflections of Weak Shock Waves from Acoustic Materials,

Descriptive Note:

Corporate Author:

DEFENCE RESEARCH ESTABLISHMENT VALCARTIER QUEBEC

Report Date:

1971-02-25

Pagination or Media Count:

5.0

Abstract:

A number of materials having good acoustic absorption properties have been tested in order to determine their relative effectiveness in attenuating weak high-frequency shock waves propagating in atmospheric air. Weak shock waves with an N-wave configuration of about 110-microsec duration were generated by rifle bullets flying 2400 ftsec over samples of acoustic material supported on a metal plate, and the details of the reflection of these waves at the surface of the various materials were monitored by using shadowgraph-schlieren photographic techniques and pressure transducers. The urethane materials available gave a high amount of surface reflection compared to fiberglass materials of similar density. The least surface reflection was obtained with very low density less than 1.0 lbcu.ft fiberglass. Author

Subject Categories:

  • Guided Missile Reentry Vehicles
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE