多重边界约束及端部缺失对多壁碳纳米管振动特性的影响

项目名称： 多重边界约束及端部缺失对多壁碳纳米管振动特性的影响

项目编号： No.11472163

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 郭兴明

作者单位： 上海大学

项目金额： 80万元

中文摘要： 碳纳米管，因其优异的力学性能在纳米器件、微纳机电系统、纳米复合材料等领域被广泛应用. 碳纳米管作为结构单元在微纳尺度结构和器件设计中起重要作用，因此碳纳米管的力学性质的精准描述非常重要。我们关注到实验[30]所测多壁碳管的固有频率远低于理论值(超过30%), 以此为基础的力学性质分析，如模量等，非常的不精准. 产生这种差异的真正原因是我们关注的核心问题. 本项目旨在通过理论建模分析和数值方法以及实验等方式讨论多重边界约束和端部缺失对多壁碳纳米管振动特性的影响, 以及其他尺度效应/非局部效应/表面效应/非线性效应/外场作用等的耦合影响, 确定以往不曾关注到的影响碳纳米管及系统的振动频率及至力学性质的因素和作用机制, 特别是不依赖于上述因素的结构物性参数的确定,为其广泛应用提供可靠的科学依据

中文关键词： 多壁碳纳米管；振动；多重边界约束；端部缺失；力学性质

英文摘要： Carbon nanotubes(CNTs) have been among the most promising materials for nanoelectronics, nanodevices, and nanocomposites because of their excellent physical, electronic and mechanical properties, and CNTs, as the configurable parts, play the important role in Micro/nano device/systems, so it is very important to describe exactly CNTs' properties. As we noted that the some recent experiments have showed that measured resonant frequencies of Multi-Walled CNTs were often much lower than the theoretical resonant frequencies, the mechanical properties including the CNTs' module based on these values maybe incorrect. What happens between the experiment and the theory? This project aim at discussing the effects of multiple boundary constraints and ends vacancy, and scale effect/nonlocal effect/surface effect/nonlinear effect and coupled fields on the vibration characteristics of multi-walled CNTs by extend continuum and MD approach and experiment, and discriminate the diathesis that affects the resonant frequencies of MWCNTs/systems and their operating mechanism ever neglected, and confirm the material parameters independent of the above diathesis.

英文关键词： multi-walled CNTs;vibration;multiple boundary constraints;ends vancy;mechanical properties