Interaction of circumferential SH0 guided wave with circumferential cracks in pipelines
Interaction of circumferential SH0 guided wave with circumferential cracks in pipelines
复制标题
周向SH0导波与管道周向裂纹的相互作用
DOI：
10.1080/10589759.2020.1839067
复制
发表时间：
2020-11-07
影响因子：
2.6
通讯作者：
Chen, Yao
中科院分区：
文献类型：
--
作者：
Shi, Wenze;Chen, Weiwei;Chen, Yao
本文旨在提供一种通过分析周向裂纹前缘和后缘反射的两个SH 0导波来检测周向裂纹的方法。建立了管道中SH 0导波传播的有限元模型，该导波由双永磁电磁超声换能器（PPM EMAT）产生。研究了环向裂纹几何参数对两种边界反射波的影响。最后给出了利用两个边缘反射波的时移估计裂纹周向扩展的精度。最后，通过实验对仿真结果进行了验证。结果表明，裂纹前缘波峰值沿周向随裂纹截面积的增加呈线性增加的趋势。随着穿透裂纹周向长度的增加，裂纹后缘波峰值呈大致周期性变化。当裂纹周向扩展不小于10 mm时，估算的周向扩展与实际扩展的相对偏差小于5.1%。利用这两种边缘反射波的相关信息，可以对管道缺陷进行准确、定量的表征。
ABSTRACT This paper aims to provide a method for detecting the circumferential crack by analysing the two reflected SH0 guided wave from the front-edge and back-edge of the circumferential crack. We established a finite element model for the propagation of SH0 guided waves in the pipe, and the waves were generated by a periodic-permanent-magnet electromagnetic acoustic transducer (PPM EMAT). The influences of the geometric parameters of the circumferential crack on the two edge-reflected waves were investigated. Subsequently, the accuracy of crack’s circumferential extent estimation by the time-shift of the two edge-reflected waves was provided. Finally, the simulated results were verified by experiments. The results show that the peak of the crack’s front-edge wave shows a linearly increasing trend with the increasing cross-section area of the crack in the circumferential direction. The peak of the crack’s back-edge wave shows a roughly periodical variation when the circumferential extent of the through-thickness crack is increased. When the crack’s circumferential extent is no less than 10 mm, the relative deviation between the estimated circumferential extent and the actual extent is less than 5.1%. The relevant information of the two edge-reflected waves can provide an accurate and quantitative pipeline defect characterisations.