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首页> 外文期刊>NDT & E international >Circumferential higher order guided wave modes for the detection and sizing of cracks and pinholes in pipe support regions
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Circumferential higher order guided wave modes for the detection and sizing of cracks and pinholes in pipe support regions

机译：圆周高阶导波模式，用于检测和确定管道支撑区域中的裂纹和针孔

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摘要

The non-dispersive propagation of ultrasonic guided wave higher order modes cluster (HOMC) traveling along the circumferential direction in a hollow cylinder and its interaction with defects in pipe support regions is reported. These circumferential guided waves were generated in mild steel (MS) pipe specimens containing artificially created axial notches (simulating axial cracks) and pinholes (simulating pinhole-like defects) of different sizes in order to simulate conditions such as cracking and corrosion under pipe supports. The characteristics of these guided waves were also studied as a function of parameters related to how they were generated; namely, using: (a) 2.25 MHz linear phased array transducer, (b) 2.25 MHz conventional circular transducer and (c) 1 MHz conventional circular transducer. These higher frequency modes were explored for their ability to detect and size defects. Because of access limitations to the pipe support region in actual field testing, the transducer was always placed at a fixed circumferential position and moved axially along the length of the pipe. The defect position along the circumference was ascertained from the time of flight while the defect size was estimated using the amplitude data. The signals obtained for all three transducer configurations are compared for their ability to locate, detect and size the above-mentioned defects. It was shown that at these relatively higher frequencies, the guided wave modes exhibit small dispersion and have the ability to provide improved imaging of small size defects throughout the cross-section of the pipe.
机译：报道了在空心圆柱体中沿圆周方向行进的超声导波高阶模态簇（HOMC）的非分散传播及其与管道支撑区域缺陷的相互作用。这些周向导波是在低碳钢（MS）管样品中产生的，该样品包含人工创建的轴向缺口（模拟轴向裂纹）和不同尺寸的针孔（模拟针孔状缺陷），以便模拟诸如在管道支撑下开裂和腐蚀的情况。还研究了这些导波的特性，作为与它们如何产生有关的参数的函数。即，使用：（a）2.25 MHz线性相控阵换能器，（b）2.25 MHz常规圆形换能器和（c）1 MHz常规圆形换能器。探索了这些更高频率的模式，以发现并确定缺陷的大小。由于在实际的现场测试中对管道支撑区域的访问限制，换能器始终放置在固定的圆周位置，并沿管道的长度轴向移动。从飞行时间开始确定沿圆周的缺陷位置，同时使用振幅数据估算缺陷尺寸。比较所有三种换能器配置获得的信号的定位，检测和确定上述缺陷的能力。结果表明，在这些相对较高的频率下，导波模式表现出较小的色散，并具有在整个管道横截面中改善小尺寸缺陷成像的能力。

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