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Shear-band capturing using a multiscale extended digital image correlation technique

机译:使用多尺度扩展数字图像相关技术进行剪切带捕获

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Finite elements have been used recently to solve the optical flow conservation principle invoked to determine displacement fields by digital image correlation. Inspired by these recent advances, and by the computational effort that has been accomplished during the past 10 years for the simulation of discontinuities by the extended finite element method (XFEM), an extended correlation technique is introduced for capturing shear-band like discontinuities from images of real mechanical tests. Because of the specific information at hand (i.e., gray level images), this extended finite element approach is included in a non-linear multi-grid solver. The performances of the proposed approach are discussed on two examples, namely the analysis of a bolted assembly and the formation of Piobert-Lueders bands.
机译:最近已经使用有限元解决了通过数字图像相关来确定位移场的光流守恒原理。受到这些最新进展的启发,以及过去十年来通过扩展有限元方法(XFEM)进行不连续性模拟所完成的计算工作,引入了一种扩展相关技术,用于从图像中捕获类似剪切带的不连续性实际的机械测试。由于手头有特定信息(即灰度图像),这种扩展的有限元方法包含在非线性多网格求解器中。在两个示例上讨论了所提出方法的性能,即螺栓连接组件的分析和皮奥伯特-卢德斯带的形成。

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