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首页> 外文期刊>NDT & E international >Orthogonally polarised shear waves for evaluating anisotropy and cracks in metals
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Orthogonally polarised shear waves for evaluating anisotropy and cracks in metals

机译：用于评估金属的各向异性和裂缝的正交偏振剪切波

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摘要

The detection of crack-like defects using ultrasound is a problem widely studied by the non-destructive evaluation community. In this work, a technique of how to detect the presence of a crack-like defect and estimate its orientation in an anisotropic material by means of two orthogonal shear waves is presented. A detailed study of shear wave propagating and splitting at any incident angle, and its interaction with crack-like defects in anisotropic materials, is also presented. In this paper it is shown that by the use of two orthogonal shear waves with linear polarisation the authors could: 1) estimate the material level of anisotropy within approximately 0.5% of the measured value; 2) estimate the angular position of the principal shear directions of the material with respect to the orthogonal shear wave sources within ±5° accuracy; 3) excite a shear wave purely polarised along one of the principal shear directions with two orthogonal shear waves placed at an arbitrary angular position; 4) detect the presence of a crack-like defect in an anisotropic material based on the back-wall echoes of two orthogonal shear waves, 5) estimate the orientation of a crack-like defect in an anisotropic material within ～± 5° of the theoretical value. The simulation and experimental results obtained show that the technique presented in this paper has potential to become an effective tool for crack-like defect detection and material characterisation.
机译：使用超声检测裂缝状缺陷是未破坏性评估界广泛研究的问题。在这项工作中，呈现了如何通过两个正交剪切波提出了如何检测裂纹状缺陷和估计其各向异性材料中的取向的技术。还介绍了任何入射角传播和分裂的剪力波传播和分裂的详细研究，以及各向异性材料中的裂纹状缺陷的相互作用。在本文中，示出了通过使用具有线性偏振的两个正交剪切波可以：1）估计在测量值的大约0.5％的各向异性内的材料水平; 2）估计材料的主剪切方向相对于±5°的精度内的正交剪切波源的角度位置; 3）激发沿着主剪切方向之一纯度偏振的剪切波，其中两个正交剪切波处于任意角度位置; 4）基于两个正交剪切波的后壁回波检测各向异性材料中的裂纹状缺陷的存在，5）估计在〜±5°内的各向异性材料中的裂缝状缺陷的取向理论价值。获得的模拟和实验结果表明本文中提出的技术具有潜力，成为裂纹状缺陷检测和材料表征的有效工具。

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