THE COMPARATIVE STUDY OF POROSITY CHARACTERIZATION METHOD OF CARBON FIBER COMPOSITE BY ULTRASOUND

Abstract

Abstract: In this paper, we studied the method of characterizing the porosity of composites by ultrasonic method, characterized porosity using the non-linear coefficients of frequency-domain parameters, defined the classical and improved nonlinear coefficient expressions, analyzed the characteristics of the two nonlinear coefficients, and discussed the sensitivity of two kinds of nonlinear coefficients to evaluate the porosity. The porosity of carbon fiber composites was generated by changing the curing pressure. The porosity was measured by metallographic analysis, and the comparison between nonlinear coefficients and attenuation to characterize porosity was carried out. The results show that the improved nonlinear coefficient has the best effect, followed by the classical nonlinear coefficient, and the attenuation coefficient has the worst effect. Improved nonlinear coefficients are more suitable for characterizing porosity.

Key words: carbon fiber composite, porosity, classical nonlinear coefficient, improved nonlinear coefficient,
attenuation

CLC Number:

TB332

LU Ming-hui,ZHANG Xue-song*,ZHENG Shan-pu,JIANG Shu-ling. THE COMPARATIVE STUDY OF POROSITY CHARACTERIZATION METHOD OF CARBON FIBER COMPOSITE BY ULTRASOUND[J]. Fiber Reinforced Plastics/Composites, 2018, 0(7): 42-48.

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