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Variabilities detected by acoustic emission from filament-wound Aramid fiber/epoxy composite pressure vesselsTwo hundred and fifty Aramid fiber/epoxy pressure vessels were filament-wound over spherical aluminum mandrels under controlled conditions typical for advanced filament-winding. A random set of 30 vessels was proof-tested to 74% of the expected burst pressure; acoustic emission data were obtained during the proof test. A specially designed fixture was used to permit in situ calibration of the acoustic emission system for each vessel by the fracture of a 4-mm length of pencil lead (0.3 mm in diameter) which was in contact with the vessel. Acoustic emission signatures obtained during testing showed larger than expected variabilities in the mechanical damage done during the proof tests. To date, identification of the cause of these variabilities has not been determined.
Document ID
19790033600
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Hamstad, M. A.
(California, University Lawrence Livermore Laboratory, Livermore, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1978
Subject Category
Quality Assurance And Reliability
Meeting Information
Meeting: In: International Instrumentation Symposium
Location: Albuquerque, NM
Start Date: May 1, 1978
End Date: May 5, 1978
Accession Number
79A17613
Funding Number(s)
CONTRACT_GRANT: W-7405-ENG-48
CONTRACT_GRANT: NASA ORDER C-13980-C
Distribution Limits
Public
Copyright
Other

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