电学性能是影响复合导电材料综合性能的关键,它直接关系到复合材料功能开发与应用。针对石墨烯/聚氨酯复合材料电学性能分析的复杂性,采用代表体积元法,即RVE法,基于Digimat平台,通过建立分析模型,对复合材料的导电性能进行模拟,并与实验进行比对分析。制备了石墨烯/聚氨酯复合导电材料,在分析复合材料细观结构特征的基础上,利用e-Xstream仿真软件的Digimat-FE模块建立了复合材料的代表体积元普通圆盘模型与带界面圆盘模型,模拟了不同填料添加量时复合材料体积电阻率的变化规律,探索了内含物长径比及界面相关参数对复合材料电阻率的影响,并与实验测试结果进行对比。结果表明:复合材料的电阻率随石墨烯质量分数的增加而减小,线度较好,与实验试样测试数据变化趋势和变化速率一致;与只使用普通圆盘作为内含物的模型相比,使用带有界面的圆盘模拟结果与实验值更为接近,说明创建的带界面圆盘RVE模型的有效性,可对石墨烯复合材料的导电性能进行模拟和预测。
Electrical property is the key to the comprehensive properties of composite conductive materials,and electrical property is directly related to the functional development and application of composite materials.In view of the complexity of the electrical performance analysis of graphene/polyurethane composites,the method of representative volume element is adopted.It's also called the RVE method.The conductivity of composite materials was simulated by establishing an analysis model based on Digimat software platform.Moreover,the simulation results were compared with the experimental results.Graphene/polyurethane composite conductive materials were prepared.On the basis of analyzing the meso-structure characteristics of composite materials,ordinary platelet model and the interface platelet model of representative volume element of composite materials were established by using the Digitat-FE module of e-Xstream simulation software.On this basis,the variation law of the volume resistivity of the composites with different filler additions was simulated.The effects of inclusions length-diameter ratio and interfacial parameters on the resistivity of composites were also investigated,and the simulation data was compared with the experimental results.The results show that,the resistivity of the composite decreases with the increase of the mass fraction of graphene,and the linearity is good,which is consistent with the change trend and rate of the test data of the test sample.Compared with the model which only uses the ordinary disk as the inclusion,the simulation results using the disk with interface are closer to the experimental values.This shows the validity of the RVE model with interface disc,which can simulate and predict the conductivity of graphene composites.
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