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首页> 外文期刊>Journal of engineering materials and technology >Stress Gradient Induced Strain Localization in Metals: High Resolution Strain Cross Sectioning via Synchrotron X-Ray Diffraction
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Stress Gradient Induced Strain Localization in Metals: High Resolution Strain Cross Sectioning via Synchrotron X-Ray Diffraction

机译：应力梯度引起的金属应变局部化：通过同步加速器X射线衍射实现的高分辨率应变截面

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摘要

Strain localization in the presence of a stress gradient is a phenomenon common to many systems described by continuum mechanics. Variations of this complex phenomenon lead to interesting nonlinear effects in materials/engineering science as well as in other fields. Here, the synchrotron based energy dispersive x-ray diffraction (EDXRD) technique is used for high spatial resolution profiling of both compression and tension induced strain localization in important materials/engineering problems. Specifically, compression induced strain localization in shot peened materials and tension induced strain localization in the plastic zones adjoining the faces of a fatigue crack are profiled. The utility of the EDXRD synchrotron technique for nondestructively cross-sectioning strain variations on small length scales (down to 10-20 μm) is described. While the strain field profiling relies on the shift of the Bragg lines, the data show that plastic deformation regions can also consistently be seen in the broadening of the Bragg peaks through the full width at half maximum parameter. Quantitative correlations between the synchrotron based x-ray determined deformations and surface deformations, as measured by optical surface height profiling, are also made.
机译：在存在应力梯度的情况下，应变局部化是连续力学描述的许多系统共有的现象。这种复杂现象的变化导致材料/工程科学以及其他领域出现有趣的非线性效应。在这里，基于同步加速器的能量色散X射线衍射（EDXRD）技术用于对重要材料/工程问题中的压缩和拉伸引起的应变局部化进行高空间分辨率分析。具体地，对喷丸材料中的压缩引起的应变局部化和与疲劳裂纹的面相邻的塑料区域中的拉伸引起的应变局部化进行了轮廓分析。描述了EDXRD同步加速器技术在小长度尺度（低至10-20μm）上无损横截面应变变化的实用性。尽管应变场分布依赖于布拉格线的移动，但数据表明，在整个最大半值宽度参数的布拉格峰变宽时，也可以始终看到塑性变形区域。还进行了基于同步加速器的X射线确定的变形与表面变形之间的定量相关性，如通过光学表面高度轮廓测量的那样。

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