多晶石墨烯拉伸力学性能及其影响因素的灵敏度分析

发布时间：2018-06-15 03:12

本文选题：分子动力学 + 多晶石墨烯　；参考：《固体力学学报》2016年03期

【摘要】：晶粒尺寸、温度和应变率等对纳米材料的力学性能有重要影响.论文通过分子动力学(MD)数值模拟,分析了不同晶粒尺寸多晶石墨烯在不同温度、拉伸应变率下的杨氏弹性模量、极限应力和极限应变等拉伸力学性能.结果表明,晶粒尺寸、温度和拉伸应变率对拉伸力学性能有较大影响.利用正交实验理论,分别分析了杨氏弹性模量、极限应力和极限应变对晶粒尺寸、温度和拉伸应变率的敏感程度.结果表明,杨氏弹性模量和极限应力对影响因素的敏感程度由大到小依次为晶粒尺寸、温度和拉伸应变率;极限应变对影响因素的敏感程度由大到小依次为晶粒尺寸、拉伸应变率和温度.研究结果可为多晶石墨烯的理论研究和工程应用提供参考.
[Abstract]:Grain size, temperature and strain rate have an important effect on the mechanical properties of nanomaterials. In this paper, the tensile mechanical properties of polycrystalline graphene with different grain sizes, such as Young's elastic modulus, ultimate stress and ultimate strain at different temperature and tensile strain rate, are analyzed by molecular dynamics (MD) numerical simulation. The results show that grain size, temperature and tensile strain rate have great influence on tensile mechanical properties. The sensitivity of Young's modulus of elasticity, ultimate stress and ultimate strain to grain size, temperature and tensile strain rate were analyzed by means of orthogonal experiment theory. The results show that the sensitivity of Young's modulus of elasticity and ultimate stress to the influencing factors is the grain size, the temperature and the tensile strain rate, and the sensitivity of the limit strain to the influencing factors is the grain size. Tensile strain rate and temperature. The results can provide a reference for the theoretical study and engineering application of polycrystalline graphene.
【作者单位】：西安建筑科技大学理学院力学系;
【基金】：陕西省工业科技攻关(2015GY141) 省教育厅专项科研项目(15JK1400) 西安建筑科技大学人才基金项目(RC1601)资助
【分类号】：O341

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