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Magnetic Stress Sensing System for Nondestructive Stress Testing of Structural Steel and Steel Truss Components Based on Existing Magnetism

机译:基于现有磁力的结构钢和钢桁架组件无损应力测试磁力传感系统

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摘要

To detect the stress of steel structures and members using the existing magnetism, a magnetic stress sensing system integrating a magnetic flux induction coil, a magnetic flux measurement device, a loaded device, and data acquisition software was developed. The magnetic coupling test research was carried out for different grades of structural building and bridge steel specimens to establish the magnetic stress flux mathematical model, and the fitting equation of the magnetic flux changes with the positions of different sections of specimens was analyzed. Furthermore, a practical formula for stress detection was obtained through the experiments. Meanwhile, on these bases, the typical steel truss structure model of a Bailey beam was designed and manufactured under different working conditions, nondestructive online stress testing was carried out, and the stress of the model structure and its members was measured by strain and magnetic flux tests to obtain the curves of the test results for the stress–strain and magnetic stress flux, respectively. The results of these two methods are in good agreement with each other. The stress of the steel truss model structure was analyzed and calculated using the finite element method. The results agreed well with the experimental results from the magnetic stress sensing system—the maximum error was about 5%, which meets the requirements of engineering applications.
机译:为了使用现有磁力的钢结构和构件的应力,开发了整合磁通量感应线圈,磁通量装置,加载装置和数据采集软件的磁力传感系统。磁耦合试验研究是针对不同等级的结构建筑和桥梁标本进行的,以建立磁力助焊剂数学模型,分析了磁通量的拟合方程随着不同部分的不同部分的位置进行了改变。此外,通过实验获得了用于应力检测的实际配方。同时,在这些碱基上,在不同的工作条件下设计和制造了Bailey梁的典型钢桁架结构模型,进行了无损在线压力测试,通过应变和磁通量测量模型结构及其构件的压力测试以分别获得应力 - 应变和磁力通量的测试结果的曲线。这两种方法的结果彼此吻合良好。使用有限元法分析和计算钢桁架模型结构的应力。结果与磁力传感系统的实验结果相同,最大误差约为5%,符合工程应用的要求。

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