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摘要:
It is a diffcult and challenging subject for non-destructive testing and evaluation of adhesive structure by ultrasonic guided waves. For this issue, the phase shift of SH0 guided wave transmitting in perfect connected trilaminar plate-like adhesive structure was researched. Firstly, the phase-difference analytical model between the incident and transmission/reflection SH0 guided wave, which based on the control equation of wave propagation, was established. Then, the phase-difference curves of reflection/transmission SH0 guided wave in aluminum/epoxy resin/aluminum adhesive structure were calculated by numerical simulation. Finally, the effects of changes of incident angle and frequency-thickness product on the phase-difference of reflection/transmission SH0 guided wave were analyzed. The results show that the changes of phase-difference of reflection/transmission SH0 guided wave transmitting in adhesive structure mainly depend on the parameter as incident angle or frequency of acoustic wave, for the concrete bonding structure. The reflection and incident SH0 guided waves are in the same phase when the ultrasound is incident under a particular frequency-thickness product. Despite the angle of incidence, the phase-difference curve of reflection SH0 guided wave shows periodic resonance with the increasement of frequency-thickness product. For the transmission SH0 guided wave, the change of the phase-difference curve has no law to follow when the ultrasound is normal incident. But the phase-difference curve changes from irregularity to regularity as the angle of incidence increase. The results obtained could provide the theory support for studying the propagation characteristics of SH0 guided wave in plate-like bonding structure and information retrieving of echoed SH0 guided wave and positioning during the experiment. © 2017, Editorial Office of Chinese Journal of Theoretical and Applied Mechanics. All right reserved.
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来源 :
Chinese Journal of Theoretical and Applied Mechanics
ISSN: 0459-1879
年份: 2017
期: 1
卷: 49
页码: 202-211