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Deformation Fields Measurement of Crack Tip under High-Frequency Resonant Loading Using a Novel Hybrid Image Processing Method

机译：新型混合图像处理方法在高频共振载荷下裂纹尖端的变形场测量

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摘要

A novel hybrid image processing method is proposed to obtain the crack tip location, crack propagation path, displacement, strain fields, and plastic zone size of crack tip region under high-frequency resonant loading in this paper. An ordinary CCD camera is used to collect a series of crack images on one side of the compact tension (CT) specimen; meanwhile, a high-speed digital camera is used to acquire a series of digital speckle images of the other side of the specimen under the loading conditions at regular time intervals. Digital image processing (DIP) method is used to determine the macroscopic crack position. Digital image correlation (DIC) method is applied to obtain the displacement, strain fields, and plastic zone size of crack tip region. The characteristic digital speckle images of one stress cycle are obtained by data fitting and image matching method. Accordingly, the displacement/strain fields of crack tip region within one stress cycle and the displacement and strain amplitude fields with different crack lengths are obtained and analyzed. The obtained results are compared with the measured results of ordinary methods and show a good match. The success of this method will help to obtain better insight into and understanding of the fatigue and failure behavior of metal material with mode I crack under high-frequency resonant loading.
机译：提出了一种新的混合图像处理方法，以求得高频共振载荷下裂纹尖端区域的裂纹尖端位置，裂纹扩展路径，位移，应变场和塑性区大小。普通的CCD摄像机用于在致密拉伸（CT）样品的一侧收集一系列的裂纹图像。同时，在负载条件下，以规则的时间间隔使用高速数码相机获取样品另一侧的一系列数字散斑图像。使用数字图像处理（DIP）方法确定宏观裂纹位置。应用数字图像相关（DIC）方法获得裂纹尖端区域的位移，应变场和塑性区大小。通过数据拟合和图像匹配方法获得一个应力周期的特征数字散斑图像。因此，获得并分析了一个应力循环内裂纹尖端区域的位移/应变场，以及具有不同裂纹长度的位移和应变振幅场。将获得的结果与常规方法的测量结果进行比较，并显示出良好的匹配性。该方法的成功将有助于更好地了解和理解高频共振载荷下具有I型裂纹的金属材料的疲劳和破坏行为。

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