Accession Number:

ADA305024

Title:

Acoustic Emission Testing of Composite Vessels Under Sustained Loading.

Descriptive Note:

Technical memo.,

Corporate Author:

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s):

Report Date:

1978-10-11

Pagination or Media Count:

25.0

Abstract:

This paper describes a study of the acoustic emissions AE generated from Kevlar 49epoxy composite pressure vessels subjected to sustained load-to-failure tests. The AE data from two different transducer locations on the vessels were compared. It was found that AE from vessel wall-mounted transducers showed a wide variance from those for identical vessels subjected to the same pressure loading. AE from boss-mounted transducers did, however, yield values that were relatively consistent. It appears that the signals from the boss-mounted transducers represent an integrated average of the emissions generated by fibers fracturing during the vessel tests. The AE from boss-mounted transducers were also independent of time for vessel failure. This suggests that a similar number of fiber fractures must occur prior to initiation of vessel failure. These studies indicate a potential for developing an AE test procedure for predicting the residual service life or integrity of composite vessels. MM

Subject Categories:

  • Laminates and Composite Materials
  • Plastics
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE