Residual Magnetic Field Non-Destructive Testing of Gantry Cranes
Residual Magnetic Field Non-Destructive Testing of Gantry Cranes
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DOI：
10.3390/ma12040564
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发表时间：
2019-02-02
期刊：
影响因子：
3.4
通讯作者：
Juraszek, Janusz
中科院分区：
文献类型：
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作者：
Juraszek, Janusz
用剩余磁场法对龙门起重机进行了为期7年的无损检测。确定了剩余磁场的切向和法向梯度分量的分布。建立了磁图数据库。结果表明，切向分量的梯度可以用来识别和定位门式起重机梁的应力集中区。特别注意的是，在起重机5号梁（这是最受载的一个）表面上的切向分量梯度的不对称分布。异常是梁在加载时轻微扭转变形的影响。用有限元法（FEM）数值模拟来解释这一现象。引入模拟的位移边界条件是通过实验建立的。使用X射线衍射法进行了验证，该方法确认了通过RMF试验确定的应变集中区（SCZ）的位置。
Non-destructive tests of gantry cranes by means of the residual magnetic field (RMF) method were carried out for a duration of 7 years. Distributions of the residual magnetic field tangential and the normal components of their gradients were determined. A database of magnetograms was created. The results show that the gradients of tangential components can be used to identify and localize stress concentration zones in gantry crane beams. Special attention was given to the unsymmetrical distribution of the tangential component gradient on the surface of the crane beam No. 5 (which was the most loaded one). The anomaly was the effect of a slight torsional deflection of the beam as it was loaded. Numerical simulations with the finite element method (FEM) were used to explain this phenomenon. The displacement boundary conditions introduced into the simulations were established experimentally. Validation was carried out using the X-ray diffraction method, which confirmed the location of strain concentration zones (SCZs) identified by means of RMF testing.