Visualization of hidden cracks under corrosion layer in steel structures via eddy current pulsed thermography: Simulation and experiment

IF 4.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Ndt & E International Pub Date : 2025-06-01 Epub Date: 2025-01-15 DOI:10.1016/j.ndteint.2025.103321

Jing Xie , Lina Chen , Yage Han , Weiping Huang , Guozhen Li , Changhang Xu

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Abstract

Cracks in steel structures are usually covered by corrosion material and become a hidden hazard to the safety of the structures. It is significantly hard to detect this kind of hidden cracks because of the serious interference form the corrosion layer. This study aims to evaluate the effectiveness of eddy current pulsed thermography (ECPT) in visualizing such hidden cracks and to conduct an in-depth investigation into the inspection mechanism. A simulation model is constructed to analyze electromagnetic and thermal response in the inspected object, which helps to determine the specific thermal features caused by hidden cracks and to clarify the inspection mechanism. Experiments were implemented to verify the effectiveness of ECPT and to confirm thermal features caused by hidden cracks at the inspected surface. Simulation and experimental results show that specific thermal features caused by hidden cracks provide a means of recognizing the hidden cracks from the inspection results. Experimental results also verify that ECPT presents good applicability for specimens with various corrosion severity and for cracks with various orientations. Without need of additional preprocessing of the corroded surface, this work provides a non-contact, instant and intuitive way to visualize the hidden cracks covered by corrosion in steel structures.

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用涡流脉冲热成像技术显示钢结构腐蚀层下隐藏裂纹：模拟与实验

钢结构裂缝通常被腐蚀材料覆盖，成为影响结构安全的隐患。由于受到腐蚀层的严重干扰，这类隐性裂纹的检测难度很大。本研究旨在评估涡流脉冲热成像（ECPT）在显示此类隐藏裂纹方面的有效性，并对其检测机制进行深入研究。通过建立仿真模型，分析被检测物体的电磁响应和热响应，确定隐蔽裂纹引起的具体热特征，明确检测机理。通过实验验证了ECPT的有效性，并确定了被检测表面隐藏裂纹引起的热特征。仿真和实验结果表明，隐藏裂纹引起的特定热特征为从检测结果中识别隐藏裂纹提供了一种方法。实验结果也验证了ECPT对不同腐蚀程度的试样和不同取向的裂纹具有良好的适用性。不需要对腐蚀表面进行额外的预处理，这项工作提供了一种非接触、即时和直观的方式来可视化钢结构中被腐蚀覆盖的隐藏裂缝。

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来源期刊

Ndt & E International 工程技术-材料科学：表征与测试

CiteScore

7.20

自引率

9.50%

发文量

121

审稿时长

55 days

期刊介绍： NDT&E international publishes peer-reviewed results of original research and development in all categories of the fields of nondestructive testing and evaluation including ultrasonics, electromagnetics, radiography, optical and thermal methods. In addition to traditional NDE topics, the emerging technology area of inspection of civil structures and materials is also emphasized. The journal publishes original papers on research and development of new inspection techniques and methods, as well as on novel and innovative applications of established methods. Papers on NDE sensors and their applications both for inspection and process control, as well as papers describing novel NDE systems for structural health monitoring and their performance in industrial settings are also considered. Other regular features include international news, new equipment and a calendar of forthcoming worldwide meetings. This journal is listed in Current Contents.