Ultrasonic Guided Wave Scatterting Characteristics of Rail Base Oblique Cracks
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摘要: 钢轨轨底斜裂纹的超声导波散射特性是超声导波检测钢轨轨底技术的基础。首先对钢轨轨底导波传播特性及激发频率对导波散射特性的影响进行了数值分析, 再进一步基于ABAQUS软件建立了钢轨轨底不同角度斜裂纹散射特性的有限元模型, 对横向振动模态和垂直振动模态下钢轨轨底不同角度斜裂纹的散射特性进行了分析。数值分析和波场快照显示, 横向振动模态较垂直振动模态下超声导波在钢轨轨底斜裂纹上的频散相对严重, 垂直振动模态下导波检测钢轨斜裂纹效果更好, 为后续钢轨轨底导波检测试验提供了理论基础。Abstract: The research on ultrasonic guided wave scattering characteristics on rail base oblique cracks is the basis of the appropriate guided wave detection technology. This paper includes numerical analysis result of the guided wave propagation characteristics on rail base and the effects of different excitation frequency on it. Based on ABAQUS software, a finite element model of the rail base is established at different angles, which is used to analyze scattering characteristics of transverse and vertical vibration mode wave in the rail base at different angles .The numerical analysis results and wave field simulation snapshots show that frequency dispersion phenomenon of transverse vibration mode wave on rail base oblique cracks is more obvious than that of vertical vibration mode. It is therefore the vertical vibration mode rather than the transverse one that can give better detection effect. This study also provides a theoretical basis for the subsequent rail base guided wave detection experiments.
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Keywords:
- Rail /
- Guided wave /
- Frequency dispersion curve /
- Nondestructive testing
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