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首页> 外文期刊>NDT & E international >Characterization of axial and oblique defects in pipes using fundamental torsional guided modes
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Characterization of axial and oblique defects in pipes using fundamental torsional guided modes

机译：使用基本扭转引导模式表征管道中的轴向和倾斜缺陷

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摘要

A quantitative study of the interaction of the T(0,1) torsional mode with axial and oblique defects in a pipe is presented in this paper. A mode decomposition technique employing the chirplet transform is used to separate the multimodal signals reflected from the defects. Reflection signals are obtained from experiments on a carbon steel pipe. The influence of the crack length and inclination angle on the reflection is investigated. Reflection from an axial defect is found to consist of a series of the wave pulses with gradually decaying amplitude. Results show that the reflection coefficient of the axial crack initially increases with the crack length, but finally reaches an oscillating regime. Furthermore, it is revealed that for an oblique crack, the reflection coefficient is linearly dependent on the equivalent circumferential extent of the defect and is independent of the axial length. In addition, it is shown that the coefficients for a steep defect are greater than those for a gentle defect.
机译：本文提出了T（0,1）扭转模式与管道轴向和倾斜缺陷相互作用的定量研究。使用线性调频变换的模式分解技术用于分离从缺陷反射的多峰信号。反射信号是从碳钢管上的实验获得的。研究了裂纹长度和倾斜角度对反射的影响。发现轴向缺陷的反射由一系列振幅逐渐衰减的波脉冲组成。结果表明，轴向裂纹的反射系数起初随裂纹长度的增加而增大，但最终达到振荡态。此外，发现对于倾斜裂纹，反射系数与缺陷的等效周向范围线性相关，并且与轴向长度无关。另外，表明陡峭缺陷的系数大于平缓缺陷的系数。

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