STUDY ON ABSORBING BOUNDARY PARAMETERS OF COMPOSITE FOR ULTRASONIC GUIDED WAVE

Abstract

Abstract: In the ultrasonic nondestructive testing research, the finite element simulation of the lamb wave propagation process is helpful to understand its propagation characteristics and improve the test accuracy. Due to the structural size limitation and anisotropy of the composite material, the appearance of the boundary reflection wave in the simulation process will cover the damage waveform, and the test result is to suppress the reflected wave. The setting of the absorption boundary is particularly important. In order to effectively absorb the boundary reflection, a multi-layered Rayleigh damped incremental absorption layer is added at the model boundary. By changing the parameters such as absorption length and damping maximum, it is found that the multi-layer damping absorption layer with increasing Rayleigh damping can effectively reduce the boundary reflection wave, and the absorption boundary length has the greatest influence on the absorption effect. In order to effectively absorb the reflected wave, the absorption boundary length should be larger than the wavelength of 2 times.

Key words: ultrasonic testing, composite, rayleigh damping, absorbing boundary

CLC Number:

TB332

XIA Xiao-song, ZHENG Yan-ping, XIONG Yong-jian, ZHANG Qing-song. STUDY ON ABSORBING BOUNDARY PARAMETERS OF COMPOSITE FOR ULTRASONIC GUIDED WAVE[J]. Fiber Reinforced Plastics/Composites, 2019, 0(6): 58-63.

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