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Three-dimensional microscopic assessment of randomly distributed representative volume elements for high fiber volume fraction unidirectional composites

机译：高纤维体积分数单向复合材料随机分布的代表性体积元素的三维显微评估

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摘要

Generating realistic non-uniformly distributed three-dimensional representative volume element (RVE) for modeling the response of high fiber volume fraction composites is challenging. A novel rapid approach employing a random event-driven molecular dynamics simulation (EDMD) was proposed in this study for this purpose. Distributions of continuous unidirectional fibers in the RVEs were assessed using two approaches, namely Voronoi tessellations and radial distribution functions. The developed method was highly efficient in generating RVEs with realistic fiber dispersions. Furthermore, applying the corresponding periodic boundary conditions (PBCs) for finite element modeling is also arduous. A technique was developed within the commercial finite element software ABAQUS to rapidly produce required matching mesh patterns on opposite surfaces of the RVE, and to apply the corresponding PBCs using custom scripts. By coupling the EDMD approach and custom scripts within ABAQUS to rapidly generate and mesh RVEs with high fiber volume fractions, evaluation of the RVE response was greatly simplified. In-and out-of-plane elastic properties of unidirectional glass/epoxy composite in a range of 10-80% fiber volume fractions were determined and compared with analytical models, and available experimental data, with good correlation.
机译：生成逼真的非均匀分布的三维代表性体积元素（RVE）以对高纤维体积分数复合材料的响应进行建模是具有挑战性的。为此目的，提出了一种采用随机事件驱动的分子动力学模拟（EDMD）的新型快速方法。使用两种方法评估RVE中连续单向纤维的分布，即Voronoi镶嵌和径向分布函数。所开发的方法在生成具有真实纤维色散的RVE方面非常高效。此外，为有限元建模应用相应的周期性边界条件（PBC）也是艰巨的。在商业有限元软件ABAQUS中开发了一种技术，可以在RVE的相对表面上快速生成所需的匹配网格图案，并使用自定义脚本应用相应的PBC。通过将EDMD方法和ABAQUS中的自定义脚本结合起来，可以快速生成和网格化具有高纤维体积分数的RVE，从而大大简化了RVE响应的评估。确定了单向玻璃/环氧树脂复合材料在10-80％纤维体积分数范围内的面内和面外弹性性能，并将其与分析模型和可用的实验数据进行了比较，并具有良好的相关性。

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