Blinzler Brina J, Larsson Ragnar, Gaska Karolina, Kádár Roland
Division of Material and Computational Mechanics, Department of Industrial and Materials Science, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
Division of Engineering Materials, Department of Industrial and Materials Science, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
Nanomaterials (Basel). 2019 Nov 7;9(11):1578. doi: 10.3390/nano9111578.
Graphene nanosheets and thicker graphite nanoplatelets are being used as reinforcement in polymeric materials to improve the material properties or induce new functional properties. By improving dispersion, de-agglomerating the particles, and ensuring the desired orientation of the nano-structures in the matrix, the microstructure can be tailored to obtain specific material properties. A novel surface image assisted modeling framework is proposed to understand functional properties of the graphene enhanced polymer. The effective thermal and mechanical responses are assessed based on computational homogenization. For the mechanical response, the 2-D nanoplatelets are modeled as internal interfaces that store energy for membrane actions. The effective thermal response is obtained similarly, where 2-D nanoplatelets are represented using regions of high conductivity. Using the homogenization simulation, macroscopic stiffness properties and thermal conductivity properties are modeled and then compared to the experimental data. The proposed surface image assisted modeling yields reasonable effective mechanical and thermal properties, where the Kapitza effect plays an important part in effective thermal properties.
石墨烯纳米片和较厚的石墨纳米片正被用作聚合物材料的增强剂，以改善材料性能或赋予新的功能特性。通过改善分散性、使颗粒解聚，并确保纳米结构在基体中具有所需的取向，可以对微观结构进行调整，以获得特定的材料性能。为了理解石墨烯增强聚合物的功能特性，提出了一种新颖的表面图像辅助建模框架。基于计算均匀化评估有效的热响应和力学响应。对于力学响应，将二维纳米片建模为存储膜作用能量的内部界面。以类似的方式获得有效的热响应，其中二维纳米片用高电导率区域表示。通过均匀化模拟，对宏观刚度特性和热导率特性进行建模，然后与实验数据进行比较。所提出的表面图像辅助建模产生了合理的有效力学和热性能，其中卡皮查效应在有效热性能中起着重要作用。
