Abstract
This paper performed a radial compression fatigue test on glass fiber winding composite tubes, collected acoustic emission signals at different fatigue damages stages, used time frequency analysis techniques for modern wavelet transform, and analyzed the wave form and frequency characteristics of fatigue damaged acoustic emission signals. Three main frequency bands of acoustic emission signal had been identified: 80-160 kHz (low frequency band), 160-300 kHz (middle frequency band), and over 300kHz (high frequency band), corresponding to the three basic damage modes: the fragmentation of matrix resin, the layered damage of fiber and matrix, and the fracture of cellosilk respectively. The usage of wavelet transform enabled the separation of fatigue damaged acoustic emission signals from interference wave, and the access to characteristics of high signal-noise-ratio fatigue damage.
Highlights
As a new dynamic detection technology, the acoustic emission measurement technology has the unique advantage of being “dynamic”, ‘real-time’, “whole”, “on-line”, and so on
According to frequency distribution charts of acoustic emission signal after wavelet transformation, the duration of its high frequency energies peak is much shorter than its low frequency energy peak, while the duration for releasing energy during damage is the reflection of the ductility or brittleness of the material
Signals during high frequency and short duration should correspond to the cellosilk breakage; low frequency and long duration correspond to the destruction of the matrix resin, while middle frequency may be connected with the delamination damage of cellosilk and matrix material on the ground of the time-frequency charts
Summary
As a new dynamic detection technology, the acoustic emission measurement technology has the unique advantage of being “dynamic”, ‘real-time’, “whole”, “on-line”, and so on. With the merits of light weight, high strength, corrosion resistance, good insulating properties and thermal performance, is widely used in space engineering that requires for high performance and low weight This composite material consists of various materials and will damage and deform greatly under load. Amilcar Q. et al studied the acoustic emission signals of the "sandwich" carbon fiber reinforced composite during the process of static stretching and fatigue test, pointing out that loading conditions have significant effects on signal characteristics [7]. Through exerting radial pressure on multi-directional filament winding tube, wavelet transforming the AE signals collected in the course of damage, and filtering out noise signals among the original signals, this paper improves the accuracy of damage mechanism and sound localization when analyzing and differentiating fiber breakage, matrix cracking, and delamination of materials, and provides study foundation for the early detection of mild damage
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