INFLUENCE OF CRACK PARAMETERS ON THE LAMB NONLINEAR INDEX OF ULTRASONIC IN COMPOSITE

Abstract

Abstract: For detection of cracks in composite, a 3D finite element wave model of anisotropic composite plate considering the nonlinear crack contact was established to explore the interaction between nonlinear Lamb waves and different sizes of cracks in composite structure. The influence of the length and width of cracks on the nonlinear index of nonlinear Lamb waves was explored. The results show that the nonlinear index increases with the increase of the length of cracks within a certain range. As the width of cracks increases, the nonlinear index decreases. Using the SNAP nonlinear ultrasonic testing device in experiment, the feasibility of crack detection in composite materials by testing ultrasonic nonlinear index was verified. The experimental results show that the presence of cracks in the structure can be qualitatively evaluated by measuring the nonlinear index in the composite. This is of great significance to the follow-up nonlinear non-destructive testing of composite materials.

Key words: composite, nonlinear Lamb wave, cracks, nonlinear index, detection

CLC Number:

TB332

ZHANG Qing-song, TIE Ying, YIN Zhen-hua, XIA Xiao-song. INFLUENCE OF CRACK PARAMETERS ON THE LAMB NONLINEAR INDEX OF ULTRASONIC IN COMPOSITE[J]. Fiber Reinforced Plastics/Composites, 2019, 0(6): 17-23.

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