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首页> 外文期刊>Finite elements in analysis & design >Non-intrusive coupling of a 3-D Generalized Finite Element Method and Abaqus for the multiscale analysis of localized defects and structural features
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Non-intrusive coupling of a 3-D Generalized Finite Element Method and Abaqus for the multiscale analysis of localized defects and structural features

机译：3-D广义有限元方法和ABAQUS的非侵扰性耦合，用于局部缺陷和结构特征的多尺度分析

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This paper presents a multiscale computational framework able to resolve localized defects and features such as cracks and welds in large structures. It couples Abaqus models and 3-D Generalized Finite Element (GFEM) discretizations enriched with numerically-defined functions - the GFEM with global-local enrichments (GFEM(gl)). The structural-scale problem is modeled in Abaqus using a coarse, 3-D mesh, suitable for capturing the global response of the structure. The GFEM(gl) is used to accurately model localized features of interest that are otherwise ignored by Abaqus models. The GFEM(gl) utilizes enrichment functions provided by the solution of, potentially multiple, local problems solved in parallel. The coupling between Abaqus and GFEM(gl) models is handled by the Iterative Global-Local method (IGL). The proposed multiscale framework - denoted by the acronym IGL-GFEM(gl) in this work - is non-intrusive in the sense that the interactions between Abaqus and the GFEM(gl) solver require no modifications of Abaqus or knowledge about its implementation of the FEM. Numerical examples of a specimen undergoing localized plasticity, a hat-stiffened panel with a large number of spot welds, and a T-joint structure subjected to mixed-mode fatigue crack propagation are presented to demonstrate the accuracy and applicability of the proposed framework. The results show that the IGL-GFEM(gl) can achieve nearly the same accuracy as a Direct Finite Element Analysis (DFEA) while leveraging methodologies and algorithms implemented in commercial and research software. Moreover, it is also shown that the user time spent on model preparation can be greatly reduced when dealing with complex problems.
机译：本文介绍了能够解决大型结构中的局部缺陷和功能的多尺度计算框架。它耦合ABAQUS模型和3-D广义有限元（GFEM）离散化，富含数值定义的功能 - 具有全球局部浓缩的GFEM（GFEM（GL））。结构尺度问题在ABAQUS中使用粗略的3-D网格进行建模，适用于捕获结构的全局响应。 GFEM（GL）用于准确地模拟由ABAQUS模型忽略的兴趣的本地化特征。 GFEM（GL）利用通过并行解决的潜在多个局部问题的解决方案提供的富集功能。 ABAQUS和GFEM（GL）模型之间的耦合由迭代全局本地方法（IGL）处理。拟议的MultiScale框架 - 由此作品中的AGRONYM IGL-GFEM（GL）表示 - 这是非侵入性的，即ABAQUS和GFEM（GL）求解器之间的相互作用要求无安巴斯或关于其实施的知识的修改FEM。展示了局部塑性的样品的数值例子，具有大量点焊缝的帽子加强面板，以及经过混合模式疲劳裂纹传播的T关节结构，以证明所提出的框架的准确性和适用性。结果表明，IGL-GFEM（GL）可以实现与直接有限元分析（DFEA）的几乎相同的精度，同时利用商业和研究软件中实施的方法和算法。此外，还表明，在处理复杂问题时，可以大大减少在模型准备上花费的用户时间。

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