Measurement of elastic and rotation fields during irreversible deformation using Heaviside-digital image correlation
Measurement of elastic and rotation fields during irreversible deformation using Heaviside-digital image correlation
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DOI：
10.1016/j.matchar.2020.110600
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发表时间：
2020-11
影响因子：
4.7
通讯作者：
J. Stinville;M. Charpagne;F. Bourdin;P. Callahan;Zhe Chen;M. Echlin;D. Texier;J. Cormier;P. Villechaise;T. Pollock;V. Valle
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文献类型：
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作者：
J. Stinville;M. Charpagne;F. Bourdin;P. Callahan;Zhe Chen;M. Echlin;D. Texier;J. Cormier;P. Villechaise;T. Pollock;V. Valle
最近发展起来的高分辨率和容忍不连续的数字图像相关技术使得提取位移场内的不连续成为可能。该技术对各种材料系统(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了定量分析。可容忍不连续的数字图像相关方法不仅可以用于定量的不连续分析，还可以恢复在这些不连续附近工作的局部应变场和旋转场。目前的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，用于分析多晶金属材料在变形过程中形成的塑性和弹性场。不连续容限DIC技术与内部梯度的计算相结合，可以提取镍基高温合金塑性变形过程中的非局域应变场和旋转场。因此，变形过程中发生的晶格旋转/膨胀和塑性局部化可以在一次实验中确定。利用预置形变的合成图像和电子背散射衍射(EBSD)技术进行了实验测量，验证了该方法的有效性。
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.