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Ultrasonic compression wave NDT of adhered metal lap joints of uncertain dimensions

机译：尺寸不确定的金属搭接接头的超声压缩波无损检测

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This paper is concerned with non-destructive testing of adhered lap joints using simple compression wave pulse-echo apparatus applied to bondlines in which the thickness of the adhesive layer is not known, and to which physical access is only available on one side of the structure. We consider in detail the nature of the time domain reflection response using a combination of results simulated using a transfer matrix wave propagation model, and results obtained from physical experiment. An adaptive filter is introduced which enables the decay rate of reverberations in the front adherend to be estimated. This parameter can be used as the basis of front adherend disbond detection, and possibly to detect wrong material as distinct from cured adhesive, in contact with the adherend. A discussion is included which assesses the computation errors that would be involved in using the reverberation decay rate to estimate the characteristic impedance of the adhesive layer, and thence its cure state. The adaptive filter is then used to reduce the extent to which strong adherend reverberations mask very low amplitude echoes which are diagnostic of a void-disbond between the adhesive and the rear adherend, furthest from the interrogating transducer. Whether or not such a disbond is detectable is determined for a range of adhesive layer and adherend thicknesses. For the purpose of comparison with the time domain analysis we include a brief discussion on the use of the frequency domain representation of the bond reflection response for similar detection tasks; it is shown that the frequency domain can be employed in situations when the bond layer thicknesses are known, but would not be appropriate if these dimensions are not known a priori.
机译：本文涉及的是使用简单的压缩波脉冲回波设备对搭接接头的无损检测，该设备适用于粘结层，粘结层的厚度未知，并且只能在结构的一侧进行物理接触。我们将结合使用传输矩阵波传播模型模拟的结果和从物理实验获得的结果，来详细考虑时域反射响应的性质。引入了自适应滤波器，该滤波器可以估计前被粘物中混响的衰减率。该参数可以用作前被粘物脱粘检测的基础，并且可以检测与被粘物接触的不同于固化胶粘剂的错误材料。讨论内容包括评估使用混响衰减率估算粘合剂层的特征阻抗及其固化状态所涉及的计算误差。然后使用自适应滤波器来减少强粘附体混响掩盖非常低幅度回波的程度，这可以诊断距离询问换能器最远的粘合剂和后粘附体之间的空隙。对于粘合剂层和被粘物厚度的范围，确定是否可以检测到这种剥离。为了与时域分析进行比较，我们简要讨论了键反射反应的频域表示在类似检测任务中的使用。结果表明，频域可以用在粘结层厚度已知的情况下，但是如果这些尺寸不是先验已知的，则不合适。

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