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Detection and assessment of pitting corrosion in rebars using scattering of ultrasonic guided waves

机译：使用超声波导波散射检测和评估钢筋中的点蚀

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摘要

The present study aims at developing a robust non-destructive evaluation technique by using the scattering of ultrasonic guided waves for early detection and assessment of localised damage in bare rebars in the form of corrosion pits. The guided wave interaction with the pitting corrosion is numerically simulated by using finite element analysis, and the results are validated with experiments. The received signal contains several wave packets, which could be identified as various scattered modes that are generated from the edges of the corroded region. It is found that when the damage is placed at the centre of the rebar, several scattered wave modes superimpose to form two distinct wave packets in the received signal. A damage index is proposed by using these two distinct wave packets. It is shown that the proposed damage index method can be used successfully to monitor the axial extent and intensity of pitting corrosion in rebars. However, for the pitting corrosion that is situated at an arbitrary position, a different methodology, which utilises the differential time of arrival of various scattered wave modes, is proposed to identify the location of the pitting corrosion. Finally, a non-dimensional parameter, namely the scatter coefficient, is defined to analyse the energy contributions of various scatter modes. It is found that this scatter coefficient gradually increases with the mass loss and that the increment is pronounced when the corrosion pit is closer to the receiver location. The findings of the study can be used to identify the pitting corrosion in bare rebars.
机译：本研究旨在通过使用超声波导波的散射来开发健壮的无损评估技术，以早期检测和评估裸露钢筋中以腐蚀点形式出现的局部损伤。利用有限元分析对导波与点蚀的相互作用进行了数值模拟，并通过实验验证了结果。接收到的信号包含几个波包，可以将其识别为从受腐蚀区域的边缘生成的各种散射模式。可以发现，当损伤位于钢筋的中心时，几个散射波模式会叠加在一起，在接收信号中形成两个不同的波包。通过使用这两个不同的波包提出了一种破坏指数。结果表明，所提出的损伤指标方法可以成功地用于监测钢筋点蚀的轴向范围和强度。然而，对于位于任意位置的点蚀，提出了一种不同的方法，该方法利用各种散射波模式的到达时间差来确定点蚀的位置。最后，定义一个无量纲参数，即散射系数，以分析各种散射模式的能量贡献。发现该散射系数随着质量损失而逐渐增加，并且当腐蚀坑更靠近接收器位置时该增加是明显的。研究的结果可用于识别裸钢筋中的点蚀。

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