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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >A TRANSIENT MODEL FOR THE SIMULATION OF NONDESTRUCTIVE EXPERIMENTS INCLUDING SURFACE WAVE EFFECTS ON CRACKS
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A TRANSIENT MODEL FOR THE SIMULATION OF NONDESTRUCTIVE EXPERIMENTS INCLUDING SURFACE WAVE EFFECTS ON CRACKS

机译：用于模拟包括裂纹的表面波效应在内的非破坏性实验的瞬态模型

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摘要

This paper has presented transient GTD model for analyzing the 3D scattering of wideband beams by planar cracks that includes surface (Rayleigh) wave effects. The use of analytic signal representation incorporates explicitly the transient behavior of the field. For a given probe which can be either plane, spherical, bifocal, trifocal or with a Fermat's surface, the echo waveforms are calculated as a function of probe position. The 3D model predicts typical scanning of the probe. It allows for the prediction of the influence of crack orientation parameters (tilt, skew and third angle). It predicts the whole echo structure with quantitative information on both amplitude and pulse shape. The simulation deals with pulse-echo testing configurations but the theoretical model could be easily adapted to pitch-catch ones. Examples given in the present paper demonstrate the accuracy of the model and corroborate many previous deductions. The model gives good insight in expertise of crack like defects. It may further be used in model based inversion algorithms.
机译：本文提出了一种瞬态GTD模型，该模型用于分析包括表面（Rayleigh）波效应的平面裂缝对宽带光束的3D散射。解析信号表示的使用明确地包含了场的瞬态行为。对于既定平面，球形，双焦点，三焦点或具有费马表面的给定探头，回波波形将根据探头位置进行计算。 3D模型可预测探针的典型扫描情况。它可以预测裂纹取向参数（倾斜，倾斜和第三角度）的影响。它利用有关幅度和脉冲形状的定量信息来预测整个回波结构。该模拟处理脉冲回波测试配置，但理论模型可以轻松地适用于音高捕获测试。本文给出的示例证明了该模型的准确性，并证实了许多先前的推论。该模型可以很好地洞悉裂纹等缺陷的专业知识。它可以进一步用于基于模型的反演算法中。

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