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首页> 外文期刊>NDT & E international >Ultrasonic crack evaluation by phase coherence processing and TFM and its application to online monitoring in fatigue tests
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Ultrasonic crack evaluation by phase coherence processing and TFM and its application to online monitoring in fatigue tests

机译：相干处理和TFM超声裂纹评估及其在疲劳测试在线监测中的应用

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摘要

This work proposes a new ultrasonic imaging method for crack evaluation with arrays, and investigates its application to online monitoring of crack propagation in fatigue tests. The Total Focusing Method (TFM) is used to obtain the best possible image of the crack propagation path and orientation, while Phase Coherence Imaging (PCI) is used to precisely determining its length by accurately locating the tips position. Experimental verification was performed with a 15 MHz array and a set of 4 samples tested up to different crack lengths by cyclic loading. Crack orientation and length obtained with the proposed method showed good matching with optical measurements, and sizing by tip detection with PCI was more robust than amplitude-drop sizing with TFM.
机译：这项工作提出了一种用于阵列裂纹评估的超声成像新方法，并研究了其在疲劳测试中在线监测裂纹扩展的应用。总聚焦法（TFM）用于获得裂纹传播路径和方向的最佳图像，而相干成像（PCI）用于通过精确定位尖端位置来精确确定其长度。使用15 MHz阵列进行了实验验证，并通过循环载荷测试了4个样品，测试到不同的裂纹长度。所提出的方法获得的裂纹取向和长度显示出与光学测量值的良好匹配，并且通过使用PCI的尖端检测确定尺寸比使用TFM进行幅度下降尺寸确定更可靠。

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