CAJ | 학술논문

为了探究管道中瑞利波信号的产生、传播规律，基于热弹激发机制，建立了激光线源在偏心圆管侧面激发超声波的有限元模型，研究了在不同激发源厚度下及不同曲率半径下铝质圆管中瑞利波的产生、传播规律。结果表明，均匀薄管中，管壁厚度在一定程度上决定了所产生的超声信号的成分，并且在一定范围内，超声信号也会随着管壁厚度的变化而变化；在非均匀管道中，激发源处的管壁厚度对超声信号的产生有很大影响，能在一定程度上决定超声信号的成分。这一结果对激光超声在管状材料的无损检测中的进一步应用是有帮助的。
위료탐구관도중서리파신호적산생、전파규률，기우열탄격발궤제，건립료격광선원재편심원관측면격발초성파적유한원모형，연구료재불동격발원후도하급불동곡솔반경하려질원관중서리파적산생、전파규률。결과표명，균균박관중，관벽후도재일정정도상결정료소산생적초성신호적성분，병차재일정범위내，초성신호야회수착관벽후도적변화이변화；재비균균관도중，격발원처적관벽후도대초성신호적산생유흔대영향，능재일정정도상결정초성신호적성분。저일결과대격광초성재관상재료적무손검측중적진일보응용시유방조적。
To study the propagation of Rayleigh waves in a hollow cylinder,a finite element algorithm is put forward to simulate laser inducing Rayleigh waves in a hollow cylinder based on the thermoelastic mechanism.The Rayleigh waves induced by line laser source in hollow cylinders with different source-thickness and different radius were simulated and typical results were presented.Simulation results show that in the uniform thin hollow cylinder,the composition of ultrasonic waves is partly determined by the thickness of the hollow cylinder,and in a certain range,the ultrasonic waves are changing when the thickness of the hollow cylinder is changing;in the non-uniform hollow cylinder,the thickness of the source-thickness has a great influence on the generation of ultrasonic waves,and to some extent,it can determine the components of the waves.This work will provide a useful guidance for the further application of laser ultrasonic in the cylinder nondestructive testing field.