Wang Junpu, Yue Xiaozhuang, Wang Yuxuan, Di Liupeng, Wang Wenzhi, Wei Jingchao, Yu Fei
College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China.
Polymers (Basel). 2024 Oct 6;16(19):2824. doi: 10.3390/polym16192824.
Carbon nanotubes (CNTs) are extensively utilized in the fabrication of high-performance composites due to their exceptional mechanical, electrical, and thermal characteristics. To investigate the mechanical properties of CNTs filled polymers accurately and effectively, a 3D modeling approach that incorporates the microstructural attributes of CNTs was introduced. Initially, a representative volume element model was constructed utilizing the modified nearest neighbor algorithm. During the modeling phase, a corresponding interference judgment method was suggested, taking into account the potential positional relationships among the CNTs. Subsequently, stress-strain curves of the model under various loading conditions were derived through finite element analysis employing the volume averaging technique. To validate the efficacy of the modeling approach, the stress within a CNT/epoxy resin composite with varying volume fractions under different axial strains was computed. The resulting stress-strain curves were in good agreement with experimental data from the existing literature. Hence, the modeling method proposed in this study provides a more precise representation of the random distribution of CNTs in the matrix. Furthermore, it is applicable to a broader range of aspect ratios, thereby enabling the CNT simulation model to more closely align with real-world models.
碳纳米管（CNTs）因其优异的机械、电气和热性能而被广泛应用于高性能复合材料的制造中。为了准确有效地研究碳纳米管填充聚合物的力学性能，引入了一种结合碳纳米管微观结构属性的三维建模方法。首先，利用改进的最近邻算法构建了一个代表性体积单元模型。在建模阶段，考虑到碳纳米管之间可能的位置关系，提出了一种相应的干涉判断方法。随后，采用体积平均技术通过有限元分析得出模型在各种加载条件下的应力-应变曲线。为了验证该建模方法的有效性，计算了不同轴向应变下具有不同体积分数的碳纳米管/环氧树脂复合材料中的应力。所得的应力-应变曲线与现有文献中的实验数据吻合良好。因此，本研究提出的建模方法能够更精确地表示碳纳米管在基体中的随机分布。此外，它适用于更广泛的长径比范围，从而使碳纳米管模拟模型更接近实际模型。
