摘要
采用分子动力学方法模拟了不同拉伸应变率下金纳米线的拉伸力学行为。模拟结果表明,相同截面尺寸、拉伸温度、拉伸方向的金纳米线在较高的拉伸应变率下,屈服强度较大,屈服发生的较早;更高应变率下的金纳米线在屈服时对应的应变更大,并且更容易发生二次屈服。金纳米线的弹性模量随着拉伸应变率的增大有所增加,但是幅度不是很明显。
Numerical simulations of mechanical properties of Au nanowires under tensile strain subjected to various Strain rates with the same cross-section, with the same temperature and with the same tensile orientation are presented. The simulation results show that the nanowire with the higher strain rate yields earlier and easier with the strain more notable and the elastic modulus increases with increase of strain rate while unnotable.
基金
国家自然科学基金(5142002)
中国博士后科学基金特别资助项目(201003648)
中国博士后科学基金面上资助项目(20090451343)
山东省博士后创新项目专项基金(200803033)
关键词
分子动力学
纳米线
屈服强度
弹性模量
应变率
molecular dynamics simulation, nanowire, yielding strength, elastic modulus, strain rate
