ACOUSTIC EMISSION BEHAVIOR ON INTERLAMINAR DAMAGE OF COMPOSITE BASED ON WAVELET ANALYSIS

Abstract

Abstract: Acoustic emission (AE) testing technology was used to monitor defect evolutions of wind turbine blade composite with delamination under loading in real time. In order to obtain the acoustic emission response characteristics of interlaminar failure, the waveform data-flow cascaded by VBScript was analyzed. The results showed that during the interlaminar cracking process of mode Ⅰ the fiber was damaged, but to the mode Ⅱ, only matrix was damaged, which caused great differences of acoustic emission energy between mode Ⅰand mode Ⅱ during the delamination growth. The frequency spectrum of mode Ⅰ has two wave crests, while mode Ⅱ has only one. The frequencies corresponding to the two wave crests were the main frequencies to the damaged resin and fibers. This conclusion can provide a basis for identifying the delamination damage mode of wind turbine blade composite.

Key words: wind turbine blade, composite, delamination, acoustic emission, wavelet analysis

CLC Number:

TB332

LIANG Xiao-min, ZHOU Wei, PANG Yan-rong, BAO Zheng-yu. ACOUSTIC EMISSION BEHAVIOR ON INTERLAMINAR DAMAGE OF COMPOSITE BASED ON WAVELET ANALYSIS[J]. COMPOSITES SCIENCE AND ENGINEERING, 2014, 0(8): 44-48.

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