Inspection of rail track head surfaces using electromagnetic acoustic transducers (EMATs)
Inspection of rail track head surfaces using electromagnetic acoustic transducers (EMATs)
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DOI：
10.1784/insi.46.6.326.55656
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发表时间：
2004-06
期刊：
影响因子：
1.1
通讯作者：
S. Dixon;R. Edwards;X. Jian
中科院分区：
文献类型：
--
作者：
S. Dixon;R. Edwards;X. Jian
研制了一种“一发一收”式低频宽带瑞雷波电磁超声检测系统，用于钢轨轨头轨距角裂纹缺陷的检测。严格地说，所产生的波是一种导波模式，因为传播表面不是平坦的半空间，并且这些波沿着轨道的表面传播，向下穿透到几毫米的深度。裂纹深度可以通过测量在裂纹下面通过的特定频率的瑞利波的相对量来估计。EMAT系统还具有通过精确测量表面波速度来评估轨头周围的组合微观结构和应力状态的潜力。
A 'pitch-catch' low-frequency wideband Rayleigh wave EMAT system has been developed that has been used for gauge corner cracking defect detection on the head of samples of rail track. Strictly speaking, the generated waves are a type of guided wave mode as the propagation surface is not a flat halfspace, and these waves propagate along the surface of the rail penetrating down to a depth of several millimetres. Crack depth can be estimated by measuring the relative amount of the Rayleigh wave at a particular frequency that passes underneath the crack. The EMAT system also has the potential to assess the condition of the combined microstructure and stress state around the rail head by measuring accurately the velocity of the surface waves.