Acoustic emission device and method for detecting destructive failure of carbon fiber composite material
A composite material, acoustic emission technology, applied in the direction of material analysis using acoustic emission technology, can solve the problems of expensive equipment, low sensitivity of small defects, inclusions, etc., to achieve the effect of simple operation, continuous real-time signal feedback, and high sensitivity
Inactive Publication Date: 2012-06-20
ZHEJIANG UNIV
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The invention discloses an acoustic emission device for detecting destruction failure of a carbon fiber composite material. The acoustic emission device comprises two sensors, a pre-amplifier, a band-pass filter and an acoustic emission detector, wherein the two sensors are respectively connected with the pre-amplifier; and the pre-amplifier, the band-pass filter and the acoustic emission detector are sequentially connected with each other. The acoustic emission device provided by the invention has the advantages of continuous real-time signal feedback, high sensitivity, convenient operation and the like, can dynamically extract and feed back the destructive failure information of the composite material in the loading process, can integrally detect and evaluate defect state of the entire composite material structure, and is suitable for early stage monitoring of the composite material structure or approaching failure characteristic prediction. Based on an amplitude-time diagram, an energy-time diagram, a counting-time diagram and an amplitude-position curve diagram acquired through acoustic emission detection, the method provided by the invention can accurately and rapidly determine dominant failure mode and failure mechanism of the composite material in each loading stage so as to provide technical support for deeply studying performance degradation mechanism of the composite material.
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