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Reconstruction methods and analysis of subsurface uncertainty for anisotropic microstructures

机译：各向异性微观结构的重建方法和地下不确定性分析

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摘要

In the present work, strain localization at the surface of a heavily textured material is modeled, where the subsurface microstructure was statistically reconstructed via a proposed methodology that directly uses the information given by the surface characterization. The elasto-viscoplastic simulations based within a fast Fourier transformation formulation (EVP-FFT) were compared with digital image correlation quantification of strain coupled with electron backscatter diffraction characterization of the microstructure to produce strain maps of the surfaces, and the in-plane maximum shear strain was evaluated. When modeling specimens from rolled plate of AA7050 material, both with and without a 3D subsurface reconstruction, a reasonable improvement was observed when a statistically reconstructed subsurface morphology was included in the simulations (regardless of grain morphology or orientation distribution) since it allowed the surface grains to redistribute and accommodate deformation along the third dimension. Additionally, when performing a case study on fabricated specimens that exhibited a through thickness grain structure, in order to minimize the subsurface uncertainty, the model's ability to capture the strain localization improved, thereby confirming the importance of capturing the subsurface microstructure on the surface response. These results therefore quantify the effect of the subsurface grain structure on the surface strain fields and thereby present a path forward for performing crystal plasticity simulations by presenting a subsurface reconstruction methodology based on surface characterizations.
机译：在目前的工作中，对严重纹理化材料表面的应变局部化进行了建模，其中通过直接使用表面表征给出的信息的拟议方法对地下微观结构进行了统计重建。将基于快速傅里叶变换公式（EVP-FFT）的弹粘塑性模拟与应变的数字图像相关定量以及微观结构的电子反向散射衍射特性进行比较，以产生表面的应变图以及面内最大剪切评估菌株。当使用AA7050材料的轧制板对试样进行建模时，无论是否进行3D地下重建，由于在模拟中包括了统计重建的地下形态（无论晶粒形态或取向分布如何），都可以观察到合理的改进，因为它允许表面晶粒重新分布并适应沿第三维的变形。此外，当对具有完整厚度的晶粒结构的预制试样进行案例研究时，为了最大程度地减少表面下的不确定性，模型捕获应变局部化的能力得到了改善，从而证实了捕获表面微观结构对表面响应的重要性。因此，这些结果量化了地下晶粒结构对表面应变场的影响，从而通过提出基于表面特征的地下重构方法，为进行晶体塑性模拟提供了前进的道路。

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