Representative volume elements for plasticity and creep measured from high-resolution microscale strain fields
Representative volume elements for plasticity and creep measured from high-resolution microscale strain fields
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从高分辨率微尺度应变场测量的塑性和蠕变的代表性体积元素
DOI：
10.1016/j.actamat.2021.117021
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发表时间：
2021
期刊：
影响因子：
9.4
通讯作者：
Lambros, J.
中科院分区：
文献类型：
--
作者：
Vieira, R.B.;Sehitoglu, H.;Lambros, J.
均匀化技术已被广泛应用于微尺度数值结果的放大，以预测材料的宏观响应。均匀化通常基于代表性体积元素（RVE）的概念，因此，测量RVE尺寸并了解影响它的因素是成功材料建模的关键因素。在这里，奥氏体不锈钢合金的RVE尺寸是在具有不同参数（即应力、温度和蠕变保持时间）的塑性和蠕变加载条件下（单独和组合）通过实验确定的。我们使用高分辨率的光学数字图像相关（DIC）的方法能够辨别残余应变不均匀性在微观结构水平。此外，通过将DIC的应变结果与来自电子背散射衍射（EBSD）的表面微观结构信息相结合，可以隔离晶界附近的局部应变，从而允许与负责应变积累的变形机制相关的定量观察。最后，通过比较RVE大小和局部法向剪切应变比为不同的加载参数组合的结果，晶界滑动和由此产生的应变场的不均匀性之间的关系进行了探讨。晶界滑动是主要变形机制的情况（即，在升高的温度下）具有相当小的RVE尺寸（平均晶粒尺寸的4至6倍），当与滑动不那么普遍的样品（平均晶粒尺寸的约10倍）相比时。
Homogenization techniques have been widely used in upscaling microscale numerical results to predict the macroscopic response of materials. Often homogenization is based on the concept of a representative volume element (RVE) and thus, measuring the RVE size and understanding what factors influence it are key elements in successful material modeling. Here, the size of the RVE for an austenitic stainless steel alloy is experimentally determined under, both separately and combined, plasticity and creep loading conditions with varying parameters (namely stress, temperature, and creep hold time). We use a high-resolution optical digital image correlation (DIC) methodology capable of discerning residual strain inhomogeneities at the microstructural level. Furthermore, by combining the strain results from DIC with surface microstructural information from electron backscatter diffraction (EBSD), the localized strains near grain boundaries can be isolated allowing for quantitative observations related to the deformation mechanisms responsible for strain accumulation. Finally, by comparing the results for RVE size and localized normal to shear strain ratios for different combinations of loading parameters, the relationship between grain-boundary sliding and the resulting heterogeneity of the strain field is explored. Cases where grain-boundary sliding was the dominant deformation mechanism (i.e., at elevated temperature) had considerably smaller RVE sizes (from 4 to 6 times the average grain size) when compared to samples where sliding was not as prevalent (around 10 times the average grain size).
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