The effect of axial cracks in a thick-walled pipe on the reflection characteristics of C-SH0 mode
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摘要: 采用有限元方法分析了激励信号的中心频率、轴向裂纹长度、缺陷深度和缺陷位置对周向超声导波反射的影响。利用时域反射系数R评价了轴向裂纹反射回波强度随缺陷尺寸和中心频率的变化趋势。对于一定尺寸的非贯通轴向裂纹，当中心频率从55 kHz增加到110 kHz时，周向水平剪切模态（C-SH0）的R略有增加。在给定的中心频率下，随着裂纹长度的增加，R先增大后减小，再进入振荡区，最后趋于稳定。因此，得出C-SH0模态对内部缺陷和外部缺陷具有相同的敏感性的结论。最后确定了不同轴向范围内R的最大值和最小值，可用于缺陷尺寸的定量分析。Abstract: The effects of the center frequency of excitation signal, axial crack length, depth, and positions of defects on circumferential ultrasonic guided wave reflection were analyzed. Time-domain reflection coefficient (R) was used to evaluate the variation trend of the reflection strength with the defect size and the center frequency for axial crack. For a given size of non-through-wall axial crack, the R of circumferential shear horizontal (C-SH0) mode increased slightly when the center frequency was increased from 55 kHz to 110 kHz. At a given center frequency, for through-wall axial crack, the R firstly increased linearly, then decreased, subsequently entered an oscillatory regime, and finally became stable with the increase in the crack length. Therefore, the conclusion of C-SH0 mode had the same sensitivity to internal and external defects was given. The maximum and minimum values of R at varying axial extents were identified and can be used for defect sizing.
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