Yue Yanan, Li Ning, Gao Shuling, Li Anningjing, Sun Jiangfeng
School of Civil Engineering, Tianjin University, 135 Yaguan Rd., 300350, Tianjin, China; School of Mechanical and Aerospace Engineering, Nanyang Technological University, 639798, Singapore.
School of Civil Engineering, Tianjin University, 135 Yaguan Rd., 300350, Tianjin, China; State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation, 135 Yaguan Rd., 300350, Tianjin, China; Key Laboratory of Coast Civil Structures Safety of Ministry of Education, 135 Yaguan Rd., 300350, Tianjin, China; Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration, 135 Yaguan Rd., 300350, Tianjin, China.
Ultrasonics. 2024 Sep;143:107404. doi: 10.1016/j.ultras.2024.107404. Epub 2024 Jul 24.
The estimation of corrosion induced thickness loss is critical for evaluating the remaining strength of high-strength steel (HSS) structures, particularly due to their emerging applications in ocean platforms and coastal bridges. In this study, an ultrasonic approach based on multimodal guide waves is proposed to identify thickness loss induced by electrical accelerated corrosion (EAC) in Q690E HSS samples. Both pitting corrosion and uniform corrosion were observed in the samples during the EAC testing. The average thickness loss due to corrosion in a plate-like structure can be correlated with the velocity of certain guided wave modes according to their dispersion characteristics. However, in practice, when the frequency-thickness product exceeds 1.5MHzmm, it becomes difficult to separate a single mode of guided wave. Hence, this paper addresses the use of multimodal guided waves and proposes a stretching factor that could describe the averaged velocity from different guided wave modes. This stretching factor is found to be linearly correlated to the averaged thickness loss from an analytical approach and validated by experiments. The influence of surface roughness due to pitting is found to be negligible due to the large wavelengths of guided waves. This method provides a simple and effective alternative to estimate the average thickness loss due to corrosion damage in HSS structures.
腐蚀引起的厚度损失估计对于评估高强度钢（HSS）结构的剩余强度至关重要，特别是考虑到它们在海洋平台和沿海桥梁中的新兴应用。在本研究中，提出了一种基于多模态导波的超声方法，以识别Q690E高强度钢样品中电加速腐蚀（EAC）引起的厚度损失。在电加速腐蚀测试期间，在样品中观察到了点蚀和均匀腐蚀。根据板状结构中腐蚀引起的平均厚度损失与某些导波模式的速度之间的色散特性，可以建立相关性。然而，在实际应用中，当频率-厚度乘积超过1.5MHz·mm时，很难分离出单一的导波模式。因此，本文探讨了多模态导波的应用，并提出了一个拉伸因子，该因子可以描述来自不同导波模式的平均速度。通过解析方法发现该拉伸因子与平均厚度损失呈线性相关，并通过实验进行了验证。由于导波波长较大，发现点蚀引起的表面粗糙度影响可忽略不计。该方法为估计高强度钢结构中腐蚀损伤引起的平均厚度损失提供了一种简单有效的替代方法。
