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The influence of sharp edges in corrosion profiles on the reflection of guided waves

机译：腐蚀轮廓中的锋利边缘对导波反射的影响

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摘要

The capacity of guided ultrasonic waves to size real corrosion defects remains challenging due to the complexity of the profiles encountered in practice, defects with large sudden changes in depth over a small circumferential region being particularly problematic. The objective of this paper is to diagnose whether the defect profile changes sharply by studying the frequency dependence of the reflection from the defect by separating the low and high spatial frequency components of defect profiles and analyzing their effect on the reflection coefficient (RC) spectrum. It has been found that the low pass spatial frequencies give significant reflection only at low frequencies; similarly, high spatial frequencies result in significant reflection only at high frequencies. For a defect with a sharp change in depth within a small region otherwise surrounded by general corrosion, the reflection from the high spatial frequencies contributes significantly to the maximum peak of the RC. In contrast, in the case of a more gradual corrosion patch, its high spatial frequencies make only a very modest contribution to the maximum peak RC. Also, the RC calculated by superposition of the low and high spatial frequency content of a defect gives a good approximation to the RC from the full profile. A method to diagnose the presence of sharp edges in corrosion patches based on the analysis of the RC spectrum is proposed, and the limitations of the procedure are defined. The main FE results are validated experimentally.
机译：由于在实践中遇到的轮廓的复杂性，引导的超声波确定实际腐蚀缺陷的尺寸的能力仍然具有挑战性，特别是在小圆周区域上深度突然大变化的缺陷。本文的目的是通过分离缺陷轮廓的高低空间频率分量并分析其对反射系数（RC）谱的影响，通过研究缺陷反射的频率依赖性来诊断缺陷轮廓是否急剧变化。已经发现，低通空间频率仅在低频时才产生明显的反射。类似地，高空间频率仅在高频下会导致明显的反射。对于在小范围内深度急剧变化的缺陷，否则该缺陷会被全面腐蚀所包围，高空间频率的反射会显着影响RC的最大峰值。相反，在腐蚀梯度逐渐增大的情况下，其较高的空间频率仅对最大峰值RC贡献很小。而且，通过缺陷的高低空间频率含量的叠加计算出的RC从整个轮廓可以很好地近似RC。提出了一种基于RC光谱分析的诊断腐蚀斑尖边缘的方法，并定义了该方法的局限性。有限元分析的主要结果已通过实验验证。

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