碳纳米管增强镁基复合材料细观模型构建及力学响应  

Mesoscopic Model Construction and Mechanical Response of Carbon NanotubeReinforced Magnesium Matrix Composites

作　　者：韩宝健 韩子文 应韬 郝振 李云帅 沈明杰 Han Baojian;Han Ziwen;Ying Tao;Hao Zhen;Li Yunshuai;Shen Mingjie(College of Mechanical and Electrical Engineering,Shaanxi University of Science&Technology,Xi'an 710021,China;Iron and Steel Research Institute of Ansteel Group,Anshan 114003,China;College of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai 200240,China)

机构地区：[1]陕西科技大学机电工程学院,陕西西安710021 [2]鞍钢集团钢铁研究院,辽宁鞍山114003 [3]上海交通大学材料科学与工程学院,上海200240

出　　处：《稀有金属》2024年第6期833-842,共10页Chinese Journal of Rare Metals

基　　金：中国航天科技集团有限公司第八研究院产学研合作基金项目(USCAST2021-18);国家自然科学基金项目(51701108);秦创原“科学家+工程师”队伍建设项目(2024QCY-KXJ-112);陕西高校青年创新团队(2024年)资助。

摘　　要：碳纳米管(CNTs)增强镁基复合材料的应力-应变响应预测对于理解可设计性参数在弹塑性变形阶段的影响具有重要意义。由于非均质材料有限元模拟的复杂性,在微尺度组分显式求解方面尚有一定的局限性。为获得非均质材料在弹塑性变形阶段中的宏观有效性质,基于改进的随机序列吸附算法建立了随机CNTs内嵌增强的镁基复合材料单胞物理模型,复合材料中的界面粘结层由内聚力单元代替,CNTs模型依据扫描电子显微镜(SEM)观测到的真实形貌建立。对三维数值模型进行有限元分析计算,求得表征体积单元数值模型有效性质的数值解,有效分析了拉伸载荷作用下材料基体破坏和界面脱粘、强度问题及各组成相间的应力传递机制、损伤机制。实验与模拟的对比结果表明,建立的复杂结构纳米相增强材料细观模型对于预测材料参数与细观结构、力学性能之间的响应关系能够提供客观、充分和真实的依据。Carbon nanotubes(CNTs),as reinforced phase modified magnesium matrix composites,have become the focus of atten⁃tion in the large wingspan light unmanned air vehicle,new energy vehicles and intelligent medical equipment industries due to their unique thermophysical properties,mechanical properties,and process properties.The designable parameters such as distribution pat⁃tern,structure and content of CNTs in magnesium matrix have a great influence on the macroscopic mechanical properties of materials.The prediction of stress-strain response of carbon nanotube reinforced magnesium matrix composites is of great significance for under⁃standing the influence of designable parameters in the elastic-plastic deformation stage.However,the heterogeneous carbon nanotube reinforced magnesium matrix composites have high non-uniformity and complex structure,which makes the finite element modeling difficult and the calculation accuracy low.In view of this,in order to obtain the macroscopic effective properties of heterogeneous mate⁃rials in the elastic-plastic deformation stage,a representative volume element model(RVE)of composite materials embedded with ran⁃dom CNTs was established based on the improved random sequence adsorption algorithm.The interfacial bonding layer in the compos⁃ite material was replaced by the cohesive element.CNTs model in RVE model of the composites was based on the real morphology ob⁃served by the scanning electron microscope(SEM),and the content of CNTs was consistent with the experimental content.The com⁃posite RVE model was divided into periodic structured grids,and periodic boundary conditions were applied to ensure the stress conti⁃nuity and deformation coordination at the boundary of the composite RVE model.Considering the small thickness of the interface layer observed by the transmission electron microscope in the experiment,it could be simplified into a cohesive element grid of 0 thickness.The finite element analysis and calculation of the three-dimensional numerical model we

关 键 词：镁基复合材料 表征体积单元 有限元分析 宏观有效性质 

分 类 号：TB331[一般工业技术—材料科学与工程]