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Total focusing method imaging of multidirectional CFRP laminate with model-based time delay correction

机译:基于模型时延校正的多向CFRP层压板全聚焦方法成像

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摘要

Precise knowledge of ultrasonic travel time in carbon fiber reinforced plastics (CFRP) is difficult to obtain due to the layered anisotropic nature. This paper proposes a model-based method to calculate the travel time of qP wave in CFRP laminates. The aim is to correct the time delays of total focusing method (TFM) applied to post-process the full matrix capture data for enhanced ultrasonic imaging. Experiments show that a 4.84 mm delamination is accurately sized by corrected TFM. The associated detection sensitivity is 46.0 dB and 3.6 dB above those of paintbrush acquisition and basic TFM, respectively.
机译:由于层状各向异性,很难获得碳纤维增强塑料(CFRP)中超声波传播时间的精确知识。本文提出了一种基于模型的方法来计算CFP层压板中qP波的传播时间。目的是纠正总聚焦方法(TFM)的时间延迟,该方法适用于后处理完整矩阵捕获数据以增强超声成像。实验表明,经过校正的TFM可以准确地确定4.84mm的分层大小。相关的检测灵敏度分别比画笔采集和基本TFM的检测灵敏度高46.0 dB和3.6 dB。

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