Measurement of Interface Bond Quality of Composite Structure Using Nonlinear Ultrasound

doi:10.3969/j.issn.1000-1093.2014.03.016

Abstract

Abstract: A nonlinear ultrasonic test system is established to meet the needs of evaluating the interface bond quality of composite structure. Epoxy resin is chosen as adhesive to make three sets of specimens which are made up of synthetic glass/adhesive/steel so as to simulate the different bond strengths with three different rations of epoxy resin to curing agent. For the problem of the complexity to determine the mode of lamb using lamb wave approach and the situation of that bond states cant not be evaluated based on second harmonic exciting efficiency using pulse-echo ultrasonic techniques, a method is developed, in which the specimen is excited by a single-frequency ultrasound, and A₂/A₂₁ (the ratio of second harmonic A₂ to fundamental wave A₂₁) is used to characterize the degree of nonlinear ultrasonic response. The experimental results indicate that the interface bond quality reduces with the increase in the degree of nonlinearity, and thus it can effectively evaluate the interface bond quality.

Key words: apparatus and instruments technology, nonlinear ultrasonic, reversed fundamental-frequency echo, second harmonic, composite structure, bond quality

CLC Number:

V257
TB156

JIANG Nian， WANG Zhao-ba， JIN Yong， CHEN You-xing. Measurement of Interface Bond Quality of Composite Structure Using Nonlinear Ultrasound[J]. Acta Armamentarii, 2014, 35(3): 398-402.

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