石墨烯-碳纳米管/WC陶瓷刀具材料的裂纹扩展与力学性能预报模拟

Simulation of crack propagation and mechanical properties prediction of graphene-carbon nanotubes/WC ceramic tool materials

计算机模拟技术的迅猛发展,为陶瓷刀具材料的性能预报和高通量制备提供了理论和技术支持。本文基于Python软件构建含有石墨烯(graphene,缩写为G)和碳纳米管(carbon nanotube,CNT)的WC陶瓷刀具材料微观结构的参数化模型与力学性能预报模型,研究G-CNT对WC刀具材料微观组织与裂纹扩展行为的影响规律。结果表明:与单一G相比,三维G-CNT空间结构可进一步提升WC陶瓷刀具材料的性能,G-CNT的质量分数为0.4%时,刀具材料的综合力学性能最优。强韧化机理主要包括G-CNT强弱界面超混杂分布、材料断裂模式转变和裂纹偏转等。

The rapid development of computer simulation technology provides theoretical and technical support for the performance prediction and high-throughput preparation of ceramic tool materials.In this paper,a parametric model and mechanical property prediction model of WC ceramic tool materials containing graphene(G)and carbon nanotube(CNT)were constructed based on Python software.The influence of G-CNT on the microstructure and crack propagation behavior of tool materials was mainly studied.The results show that the three-dimensional G-CNT spatial structure can further improve the properties of WC ceramics compared with single G.When the mass fraction of G-CNT is 0.4%,the tool material has the best comprehensive mechanical properties.The strengthening and toughening mechanism mainly include the super-mixed distribution of G-CNT strong and weak interfaces,material fracture mode transformation,crack deflection,etc.