NDE of Pipe Inner Corrosion With Delayed Echoes of SV Wave Propagated Circumferentially in Liquid-Filled Pipes
NDE of Pipe Inner Corrosion With Delayed Echoes of SV Wave Propagated Circumferentially in Liquid-Filled Pipes
复制标题
充液管道中SV波周向传播延迟回波的管道内腐蚀无损检测
DOI：
10.1115/pvp2003-1846
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Jyunji Miyauchi
中科院分区：
文献类型：
--
作者：
H. Nagamizo;K. Kawashima;Jyunji Miyauchi
提出了一种利用周向垂直横波、SV波在管壁内传播和纵波在液体中传播对充液管道进行内腐蚀超声检测的新方法。当管道外表面激发的SV波冲击管道内表面时，部分波能泄漏到液体中。在那里激发的纵波在液体中传播并到达管道内表面上的其他点。在那里，纵向、瑞利和SV波被激发并在管壁内/或沿着管壁再次传播。利用角波束SV波换能器，可以探测到液体中由于低速运动而产生的延迟回波。利用简单射线理论，估计了延迟回波的传播路径，并通过内表面部分屏蔽的充水管的实验进行了验证。结果表明，对于给定的测量配置，仅存在有限的传播路径，即，管道的几何形状、换能器的入射角和接收角、管道中液体的性质。利用这种新方法，我们检测了管道内壁的腐蚀程度。© 2003 ASME
A new ultrasonic NDT method is proposed for detecting inner corrosion of pipes with circumferential vertical shear wave, SV wave, propagated within the pipe wall and longitudinal wave propagated in liquid for liquid-filled pipes. When SV wave excited at the outer surface of a pipe impinges the inner surface, a part of the wave energy leaks into the liquid. Longitudinal wave excited there propagates in liquid and reaches other points on the inner surface of the pipe. At there, longitudinal, Rayleigh and SV waves are excited and propagated again within/or along the pipe wall. With angle-beam SV wave transducer, we can detect delayed echoes caused by slow velocity in liquid. Using the simple ray theory, we estimated the propagation paths of the delayed echoes and confirmed them by experiments with a water-filled pipe of partial shielding on the inner surface. The results show that only limited propagation paths exist for given measurement configuration, i.e., geometry of a pipe, incident and receiving angles of the transducers, property of liquid in a pipe. Using this new method, we detected the degree of corrosion on the inner wall of pipes.© 2003 ASME