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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Off-axis propagation of ultrasonic guided waves in thin orthotropiclayers: theoretical analysis and dynamic holographic imaging measurement
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Off-axis propagation of ultrasonic guided waves in thin orthotropiclayers: theoretical analysis and dynamic holographic imaging measurement

机译：超声波在薄正交各向异性层中的离轴传播：理论分析和动态全息成像测量

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摘要

The elastic properties of many materials in sheet or plate formncan be approximated with orthotropic symmetry. In many sheet materialnmanufacturing industries (e.g., the paper industry), manufacturersndesire knowledge of certain anisotropic elastic properties in the sheetnfor handling and quality issues. Ultrasonic wave propagation in platenmaterials forms a method to determine the anisotropic elastic propertiesnin a nondestructive manner. This work explores exact and approximatenanalysis methods of ultrasonic guided wave propagation in thin layers,nexplicitly dealing with orthotropic symmetry and propagation off-axisnwith respect to the manufacturing direction. Recent advances innfull-field ultrasonic imaging methods, based on dynamic holography,nallow simultaneous measurement of the plate wave motion in all planarndirections within a single image. Results from this laser ultrasonicnimaging approach are presented that record the lowest anti-symmetricn(flexural) mode wavefront in a single image without scanning. Specificnnumerical predictions for flexural wave propagation in two distinctlyndifferent types of paper are presented and compared with direct imagingnmeasurements. Very good agreement is obtained for the lowestnanti-symmetric plate mode using paper properties independentlyndetermined by a third party. Complete determination of the elasticnmodulus tensor for orthotropic layers requires measurement of othernmodes in addition to the lowest anti-symmetric. Theoretical predictionsnare presented for other guided wave modes [extensional (S), flexuraln(A), and shear-horizontal (SH)] in orthotropic plates with emphasis onnpropagation in all planar directions. It is shown that there arensignificant changes in the dispersion characterization of these modes atncertain frequencies (including off-axis mode coupling) that can benexploited to measure additional in-plane elastic moduli of thin layers.nAt present, the sensitivity of the imaging measurement approach limitsnexperimental investigation to relatively large amplitudes easilynproduced by flexural wave motion (>0.1 nm). Extension of thenmeasurement range and application to other plate wave modes are innprogress and shall be reported in future work
机译：片或板形式的许多材料的弹性特性可以通过正交各向异性来近似。在许多片材制造工业（例如，造纸工业）中，制造商需要关于片材中某些各向异性弹性的知识，以用于处理和质量问题。平板材料中的超声波传播形成了一种以非破坏性方式确定各向异性弹性特性的方法。这项工作探索了超声导波在薄层中传播的精确和近似分析方法，从而不明确地处理正交各向异性和相对于制造方向的轴外传播。基于动态全息技术的全场超声成像方法的最新进展，使得无法同时测量单个图像中所有平面方向上的板波运动。提出了这种激光超声成像方法的结果，该结果在不扫描的情况下在单个图像中记录了最低的抗对称（弯曲）模式波前。给出了两种明显不同类型的纸张中弯曲波传播的具体数值预测，并将其与直接成像测量进行了比较。对于最低的非对称平板模式，使用第三方独立确定的纸张属性可以获得很好的一致性。完整确定正交各向异性层的弹性模量张量，除了最低的反对称性外，还需要测量其他模态。对正交各向异性板中的其他导波模式[拉伸（S），弯曲（A）和横剪水平（SH）]进行了理论预测，重点是在所有平面方向上的传播。结果表明，在无法测量薄层附加平面内弹性模量的某些频率（包括离轴模式耦合）下，这些模式的色散特性没有显着变化.n目前，成像测量方法的灵敏度限制了实验性研究弯曲波运动容易产生的相对较大的振幅（> 0.1 nm）。随后的测量范围的扩展和在其他板波模式中的应用尚处于进展中，应在以后的工作中进行报告。

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