Propagation characteristics and simulation implementation of ultrasonic guided waves in CFRP laminates

doi:10.19936/j.cnki.2096-8000.20220528.002

Abstract

Abstract: In this paper, the method of combining numerical and finite element simulation is used to study the propagation characteristics of ultrasonic guided waves in composite laminates. Firstly, the establishment process of wave dispersion equation is theoretically analyzed, and the difference of bulk wave propagation in composite materials is introduced. Then the guided wave propagation is numerically analyzed, and finally the finite element simulation model is established, and the numerical results are used to verify the correctness and effectiveness of the simulation model. The research shows that slowness and deflection angle can well characterize the propagation characteristics of bulk waves, compared with other layer dispersion curves, the symmetrical modal wave of unidirectional laminates has a dispersion-free region above the longitudinal wave velocity, the phase velocity curve and group velocity curve of guided wave propagation in composite laminates are in consistent, and the homogeneous stiffness transformation (HST) matrix component of the laminate has a greater impact on the wave propagation, the combination of numerical value and finite element provides important help for the development of guided waves in the field of composite structure health monitoring and nondestructive testing.

Key words: composite materials, guided wave, bulk wave, dispersion curves, group velocity

CLC Number:

TB332

LI Jun, SONG Chun-sheng, LI Min-hui, LIU Yu, WEI Zi-hang. Propagation characteristics and simulation implementation of ultrasonic guided waves in CFRP laminates[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(5): 12-20.

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