基于激光超声的厚壁管内壁爬波传播的可视化

基金项目:

广东省特检院2017年度院级立项科技项目（2017CY07）；国家自然科学基金资助项目（51705470）；河南省重点研发与推广专项（182102210009）；河南省高等学校重点科研项目（18A460032）

详细信息

The Visualization of Creeping Waves Propagation on the Inner Surface of Thick Walled Pipes Based on Laser Ultrasonic

1. Zhuhai Branch, Guangdong Institute of Special Equipment Inspection and Research, Zhuhai 519002, China;
2. School of Mechanical Engineering, Zhengzhou University, Zhengzhou 450001, China

摘要: 为了研究爬波在厚壁管内壁的形成机理，采用激光超声可视化技术，观察直探头在厚壁管外激励时，超声波在厚壁管上的传播过程。结果表明：直探头在管壁上既能形成能量较强的纵波，也能形成能量较弱的横波；当超声纵波声束以接近临界入射角的方式入射到厚壁管内壁时，形成爬波；超声纵波和横波在管内壁上都产生了模态转换现象。该研究为厚壁管内壁缺陷的爬波快速无损检测提供了参考。
- 爬波 /
- 厚壁管 /
- 激光超声 /
- 可视化
Abstract: The formation mechanism of creeping waves on the inner surface of thick pipes was studied. The laser ultrasonic visualization technique was conducted for observing the propagation of ultrasonic waves on the thick pipes when a straight probe was excited on the outer surface. It was found that the straight probe excites the longitudinal waves with high energy and the shear waves with low energy, and that the creeping waves are formed when the longitudinal waves are incident on the inner surface with a critical angle. Moreover, the mode transformations occur when the longitudinal waves and the shear waves are incident on the inner surface. This study provides experimental references for nondestructive testing the inner surface of thick pipes by using creeping waves.
- creeping wave /
- thick walled pipe /
- laser ultrasonic /
- visualization

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