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通过细观力学有限元方法对Al颗粒增强聚四氟乙烯(Al/PTFE)复合材料的宏观力学性能进行了研究,基于Al颗粒粒径分布统计规律及通过SEM对该复合材料孔洞含量的统计分析,在细观层次上建立了考虑颗粒和孔洞位置和尺寸分布的随机代表性体积单元(RVE),借助ABAQUS有限元软件,对二维平面应变和三维实体模型在单轴压缩载荷作用下的力学行为进行了数值仿真;并施加了周期性边界条件(PBC)以提高数值计算结果的准确性。此外,分析了不同颗粒含量下复合材料准静态应力-应变关系,重点对细观有限元模型与准静态压缩试验结果进行了对比分析。研究结果表明:二维和三维2种模型均能较好地模拟Al/PTFE的宏观力学性能,且二维模型较三维模型计算效率更高,并进一步证实了PBC的正确性和有效性。
The macroscopic mechanical properties of Al particle reinforced polytetrafluoroethylene (Al / PTFE) composites were studied by the meso-mechanics finite element method. Based on the statistical rules of the Al particle particle size distribution and the statistical analysis of the hole content of the composite material by SEM , A stochastic representative volume element (RVE) considering the location and size distribution of particles and holes was established on the mesoscopic level. With ABAQUS finite element software, the mechanics of two-dimensional plane strain and three-dimensional solid model under uniaxial compressive load The behavior was numerically simulated and periodic boundary conditions (PBC) were applied to improve the accuracy of the numerical results. In addition, the quasi-static stress-strain relationship of the composites with different particle contents is analyzed, and the results of the comparison between the mesoscopic finite element model and the quasi-static compression tests are emphatically analyzed. The results show that two-dimensional and three-dimensional models can simulate the macroscopic mechanical properties of Al / PTFE well, and the two-dimensional model is more efficient than the three-dimensional model, and further confirms the correctness and validity of PBC.