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首页> 外文期刊>Journal of Nondestructive Evaluation >Magnetic Properties of Structural Steels for Simulation of Crack Monitoring by Finite Element Method
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Magnetic Properties of Structural Steels for Simulation of Crack Monitoring by Finite Element Method

机译：有限元法模拟裂纹监测结构钢的磁性特性

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摘要

The metal magnetic memory method is a novel technique for monitoring fatigue cracks in steel structures, which can reduce operational expenses and increase safety by minimizing inspections. The crack geometry can be identified by measuring the self magnetic flux leakage, which is induced by the Earth's magnetic field and the permanent magnetization. The finite element method can be used to simulate the induced magnetic field around cracks to help interpret the self magnetic flux leakage measurements, but it is unclear what material properties to use. This study aims to determine the magnetic permeability of structural steel for accurate simulation of the induced magnetic field around cracks by the finite element method. The induced magnetic field was extracted from measurements above two square steel plates, one without defect and one with a straight slit, and compared with finite element results in function of the relative permeability. For both plates, a uniform relative permeability could be found for which experimental and numerical results were in good agreement. For the plate without defect and a relative permeability of 350, errors were within 20% and were concentrated around the plate's edges. For the plate with the slit and a relative permeability of 225, errors were within 5%.
机译：金属磁存储器方法是一种用于监测钢结构中疲劳裂缝的新技术，这可以通过最小化检查来降低操作费用并提高安全性。通过测量由地球磁场和永磁化引起的自磁通泄漏来识别裂缝几何形状。有限元方法可用于模拟裂缝周围的诱导磁场，以帮助解释自磁通量泄漏测量，但目前尚不清楚使用什么材料特性。本研究旨在通过有限元法测定结构钢的磁导钢，以通过有限元方法进行精确模拟裂缝围绕裂缝的诱导磁场。从两个方形钢板上的测量中提取诱导的磁场，一个没有缺陷的一个，并且具有直线狭缝的一个，并与有限元进行比较导致相对渗透性的功能。对于两块板，可以找到均匀的相对渗透性，其中实验性和数值结果非常一致。对于没有缺陷的板和350​​的相对渗透性，误差在20％以内，并浓缩在板的边缘周围。对于狭缝的板和225的相对渗透率，误差在5％以内。

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