Variabilities detected by acoustic emission from filament-wound aramid fiber/epoxy composite pressure vessels

Conference · Wed Nov 30 04:00:00 EST 1977

OSTI ID:5141270

Hamstad, M A

Two 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 dia) 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. Results demonstrate the wide applicability of acoustic emission for identifying the significant process-control problems in the manufacture of fiber composites.

• Research Organization: California Univ., Livermore (USA). Lawrence Livermore Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5141270
• Report Number(s): UCRL-80268; CONF-780503-3
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420200* -- Engineering-- Facilities
Equipment
& Techniques
420500 -- Engineering-- Materials Testing
ACOUSTIC EMISSION TESTING
ACOUSTIC TESTING
COMPOSITE MATERIALS
CONTAINERS
CONTROL
EPOXIDES
FIBERS
FILAMENTS
FRACTURE PROPERTIES
MATERIALS TESTING
MECHANICAL PROPERTIES
NONDESTRUCTIVE TESTING
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PRESSURE VESSELS
QUALITY CONTROL
TESTING
VARIATIONS