Oh Se-Beom, Cheong Yong-Moo, Lee Deok-Hyun, Kim Kyung-Mo
Nuclear Materials Research Division, Korea Atomic Energy Research Institute, 989-111, Daedeok-daero, Yuseong-gu, Daejeon 34057, Korea.
Department of Materials Science and Engineering, Dankook University, Dandae-ro, Dongnam-gu, Cheonan 31116, Korea.
Materials (Basel). 2019 Mar 15;12(6):867. doi: 10.3390/ma12060867.
During inspection of piping in nuclear power plants or other industries, it is difficult to implement conventional nondestructive techniques due to limited accessibility or obstacles such as pipes with insulation, pipes buried underground, structural complexity, or radiation environments. In addition, since the defects mainly occur in the weld region or support area, it is not easy to separate defect signals from those of structural components. To solve these problems, we developed a technique to detect and monitor the formation and growth of defects, using a magnetostrictive guided wave sensor. This sensor has advantages (such as sharp and clear signal patterns and ability to easily eliminate the signal from the geometric structure) over the conventional piezoelectric transducer. To verify our technique, signals from actual pipe welds with defects were acquired and processed with our phase matching/subtraction program. The proposed technique shows a superior capability for detection and monitoring of defects, compared to the conventional guided wave methods.
在核电站或其他行业的管道检查过程中，由于可达性受限或存在诸如带保温层的管道、地下埋设管道、结构复杂或辐射环境等障碍，难以实施传统的无损检测技术。此外，由于缺陷主要出现在焊缝区域或支撑区域，因此不易将缺陷信号与结构部件的信号区分开来。为了解决这些问题，我们开发了一种利用磁致伸缩导波传感器检测和监测缺陷形成与扩展的技术。该传感器相对于传统的压电换能器具有优势（如信号模式尖锐清晰以及能够轻松消除来自几何结构的信号）。为了验证我们的技术，采集了来自实际有缺陷管道焊缝的信号，并使用我们的相位匹配/减法程序进行处理。与传统的导波方法相比，所提出的技术在缺陷检测和监测方面表现出卓越的能力。
