Abstract The recent development of the high resolution and discontinuity-tolerant digital image correlation technique enables the extraction of discontinuities within a displacement field. The technique provides quantitative analysis of discontinuities arising from slip, shear bands, cracks, and grain boundary sliding in a variety of material systems, including polycrystalline metallic materials. The discontinuity-tolerant digital image correlation method can be implemented to retrieve not only quantitative discontinuity analysis but also the local strain and rotation fields that operate near these discontinuities. The present implementation includes high-resolution digital image correlation (HR-DIC) measurements collected in a scanning electron microscope for analysis of both the plastic and elastic fields that develop during deformation of polycrystalline metallic materials. The combination of the discontinuity-tolerant DIC technique with the computation of internal gradients enables extraction of non-localized strain and rotation fields during plastic deformation of a nickel-based superalloy. Therefore the lattice rotation/expansion and plastic localization that occur during deformation can be determined in a single experiment. This method is validated using synthetic images with preset deformation, and experimental measurements using the electron back scatter diffraction (EBSD) technique.

中文翻译：

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使用 Heaviside-Digital Image Correlation 测量不可逆变形过程中的弹性和旋转场

摘要 高分辨率和耐受不连续性的数字图像相关技术的最新发展使得能够提取位移场内的不连续性。该技术可对多种材料系统（包括多晶金属材料）中的滑移、剪切带、裂纹和晶界滑动引起的不连续性进行定量分析。可以实施容忍不连续性的数字图像相关方法，不仅可以检索定量的不连续性分析，还可以检索在这些不连续性附近运行的局部应变和旋转场。本实施包括在扫描电子显微镜中收集的高分辨率数字图像相关 (HR-DIC) 测量值，用于分析多晶金属材料变形过程中产生的塑性和弹性场。将容错 DIC 技术与内部梯度计算相结合，可以在镍基高温合金的塑性变形过程中提取非局部应变和旋转场。因此，变形期间发生的晶格旋转/膨胀和塑性局部化可以在单个实验中确定。该方法使用具有预设变形的合成图像和使用电子背散射衍射 (EBSD) 技术的实验测量进行了验证。将容错 DIC 技术与内部梯度计算相结合，可以在镍基高温合金的塑性变形过程中提取非局部应变和旋转场。因此，变形期间发生的晶格旋转/膨胀和塑性局部化可以在单个实验中确定。该方法使用具有预设变形的合成图像和使用电子背散射衍射 (EBSD) 技术的实验测量进行了验证。将容错 DIC 技术与内部梯度计算相结合，可以在镍基高温合金的塑性变形过程中提取非局部应变和旋转场。因此，变形期间发生的晶格旋转/膨胀和塑性局部化可以在单个实验中确定。该方法使用具有预设变形的合成图像和使用电子背散射衍射 (EBSD) 技术的实验测量进行了验证。