CHARACTERIZATION OF UNIFORMITY OF WINDING COMPOSITE MATERIALS BY BACKSCATTERING

Abstract

Abstract: By studying the acoustic characteristics of filament winding composites and the difficulty of detecting the material by conventional ultrasonic bottom wave method, this paper presents a non-destructive testing method using ultrasonic backscattering signals to characterize the homogeneity of materials. High-power ultrasonic pulse reflection method was used to extract the echo signals from multiple regions of the glass fiber-wound composite material. The ultrasonic backscatter integral was used as a parameter to analyze the time-domain and frequency-domain of the backscatter signal. Finally, the ultrasonic nonlinearity was used. The coefficient validates its characterization effect. The results show that the time-domain backscatter integral is more sensitive to defects than the frequency domain integral and lower than the ultrasonic nonlinearity coefficient. The backscatter integral is an effective and accurate parameter for evaluating the internal quality uniformity of the material.

Key words: filament winding molding, composite materials, ultrasonic backscatter, ultrasonic nonlinearity, pulse reflection method

CLC Number:

TB332

ZHENG Shan-pu, LU Ming-hui, LIU Mo, JIANG Xian-rong. CHARACTERIZATION OF UNIFORMITY OF WINDING COMPOSITE MATERIALS BY BACKSCATTERING[J]. Fiber Reinforced Plastics/Composites, 2019, 0(1): 87-90.

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