Applicability of Stress Measurement Technique using Magneto-strictive Effect to Welded Structures
Applicability of Stress Measurement Technique using Magneto-strictive Effect to Welded Structures
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磁致伸缩效应应力测量技术对焊接结构的适用性
DOI：
10.2207/qjjws.21.532
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
S. Abuku
中科院分区：
文献类型：
--
作者：
R. Murai;E. Yanagisawa;S. Oka;Ikeda Makoto;Matsuoka Takashi;T. Hiroe;S. Abuku
在结构维护方面，有必要了解钢结构在使用中的受力情况。通常，应变片用于应力测量，但它们必须粘贴到结构上才能测量应力波动。因此，事先已经存在于结构中的应力是无法测量的。利用磁致伸缩效应的应力测量技术通过钢本身的应变来感测磁场畸变。它可以测量结构中预先存在的应力，例如恒载应力或焊接残余应力。本文对利用磁致伸缩效应测量钢桥应力进行了实验研究，得到了以下结果。(1)利用磁致伸缩效应的应力测量技术可以测量与钢桥表面条件相同的钢板的应力。(2)利用磁致伸缩效应测量钢桥跨中T梁焊接残余应力是可行的。(3)利用磁致伸缩效应，可以在200 μm厚的涂料上测量钢中的应力，也可以测量钢桥架设过程中的应力变化
On maintenance of structures, there is a strong need to know stress condition of steel structures in use. Usually, strain gauges are used for stress measurement, but they can measure stress fluctuation only after pasting them to structures. So, stress already existed in structures beforehand cannot be measured. Stress measuring technique using the magneto-strictive effect senses magnetic field distortion by strain of steel itself. It has a possibility to measure stress already existed in structures beforehand, such as dead load stress or welding residual stress. We made experimental study on measuring stress in steel bridges using the magneto-strictive effect, and the following results are obtained. (1) Stress measuring technique using the magneto-strictive effect can measure stress in steel plates which have the same surface condition as that used in steel bridges. (2) The magneto-strictive effect has a possibility to measure welding residual stress in ‡T girder of steel bridges. (3) By using the magneto-strictive effect, it is possible to measure stress in steel with 200 μm thickness paint and to measure stress change of steel bridges during erection