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Micromechanics based analysis of randomly distributed fiber reinforced composites using simplified unit cell model

机译：基于微力学的随机分布纤维增强复合材料简化单元格模型分析

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摘要

The geometry of the simplified unit cell (SUC) model [Aghdam MM, Smith DJ, Pavier MJ. Finite element micromechanical modeling of yield and collapse behavior of metal matrix composites. J Mech Phys Solids 48 (2000) 499-528] is extended to study effects of random fiber arrangement on the mechanical and thermal characterizations of unidirectional composites. The representative volume element (RVE) considered in the model consists of an r x c unit cells in which fibers are surrounded randomly by matrix cells. The presented model is general and can be used to predict the behavior of a fibrous composite subjected to thermal and mechanical, normal and shear, loading. The model also is capable of analyzing various combinations of these loading conditions such as off-axis test of unidirectional coupons. Both random and repeating fiber arrays can be considered in the model. Results for the overall thermal and elastic properties of a SiC/Ti metal matrix composite (MMC) show good agreement with both the finite element and other analytical models with repeating fiber arrays. Results of transverse properties also revealed that hexagonal array assumption for fiber arrangement is more realistic than square array assumption.
机译：简化晶胞（SUC）模型的几何形状[Aghdam MM，Smith DJ，Pavier MJ。金属基复合材料屈服和塌陷行为的有限元微机械建模。 J Mech Phys Solids 48（2000）499-528]已扩展到研究随机纤维排列对单向复合材料的机械和热学表征的影响。模型中考虑的代表性体积元素（RVE）由r x c晶胞组成，其中纤维被基质晶胞随机包围。提出的模型是通用的，可用于预测纤维复合材料在热和机械，法向和剪切，载荷作用下的行为。该模型还能够分析这些加载条件的各种组合，例如单向试样的离轴测试。在模型中可以考虑随机和重复光纤阵列。 SiC / Ti金属基复合材料（MMC）的整体热和弹性性能的结果与有限元模型和其他具有重复纤维阵列的分析模型均具有良好的一致性。横向特性的结果还表明，光纤排列的六边形阵列假设比方形阵列假设更现实。

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