Stimulation on Eddy Current Testing Signal Under Multiple Defects of Pipeline
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摘要: 由于金属构件缺陷各异，损伤部位可能存在多个缺陷，为了实现涡流检测的可靠性评价，建立了含两个矩形槽缺陷的管道二维轴对称有限元模型，计算了信号的相位和幅值。仿真结果表明，多缺陷对涡流信号的影响不同于单一缺陷，且随激励频率不同，阻抗信号偏差不同；而在进行缺陷定量表征时，缺陷的几何状态(深度、宽度、内外壁状况)会对深度较小缺陷的定量表征有影响，引起损伤评价不当，可参考幅值细致分析此影响。Abstract: The defects of metal components change greatly for various reasons and there may be multiple defects in damage location. A 2D model of an axisymmetric probe coil is developed to achieve the reliability of eddy current testing(ECT). The model of ECT is applied to the simulation of two defects in the presence of a pipe line. The variations of the amplitude and phase of ECT signal with the change of geometric state of two defects are computed in this paper. The stimulation results show multiple defects on the eddy current signal are different from the single defect. There are different deviations of composite signal with the exciting frequency change. The different geometric state of defects near damages location will also have impacts on composite signal of those defects which have less depth. This can cause inappropriate damage evaluation, but it can get a careful analysis through the difference of the amplitude for composite signal.
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Keywords:
- Multiple defect /
- Phase /
- Finite element analysis /
- Eddy current testing(ECT)
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