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Acoustic Emission as a NDE Technique for Determining Composite Rotor Blade Reliability,
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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This paper discusses the progress made in an ongoing program to investigate the use of acoustic emission AE to determine nondestructively the structural integrity of a composite main rotor blade. The blade is constructed primarily of S glassepoxy and aramidepoxy. The blade structure is composed of a multiple-cell filament-wound spar, an aramid trailing edge and a filament-wound blade skin supported by an aramid fiber paper honeycomb core. The design and manufacture of these blades have been presented elsewhere. A total of four blades are being tested, two blades with known areas of delamination and two blades without these defects. Author, modified-PL.
APPROVED FOR PUBLIC RELEASE