The influence mechanism of the strain rate on the tensile behavior of copper nanowire
The influence mechanism of the strain rate on the tensile behavior of copper nanowire
复制标题
应变速率对铜纳米线拉伸行为的影响机制
DOI：
10.1007/s11431-019-9530-6
复制
发表时间：
2019-10-14
影响因子：
4.6
通讯作者：
Liu Yan
中科院分区：
文献类型：
--
作者：
Zhao LeiYang;Liu Yan
通过分子动力学（MD）模拟研究了应变率对铜纳米线拉伸行为的影响机制。在加载应变率从 5x10(6) 到 1x10(9) s(-1) 时观察到三种失效模式。这三种模式分别称为滑移模式、混合模式和颈缩模式。原子构型的演化表明晶格回复和位错倍增的竞争决定了断裂模式，并且晶格回复的重要性随着应变率的增加而降低。由拉伸载荷引起的拉伸波的输入和反射在失效机制中也起着重要作用。在较高应变率下，颈缩的位置往往接近纳米线的两端。
The influence mechanism of the strain rate on the tensile behavior of the copper nanowires is investigated with molecular dynamics (MD) simulations. Three failure modes are observed at the loading strain rates from 5x10(6) to 1x10(9) s(-1). The three modes are named slipping mode, mixed mode and necking mode, respectively. The evolution of atomic configurations show that the competition of the lattice recovery and the dislocation multiplication determines the fracture mode, and the importance of lattice recovery decreases with the increase of strain rate. The input and the reflection of the tensile wave, which is induced by tensile loading, also plays an important role in the failure mechanism. The location of necking tends to approach the two ends of nanowire at higher strain rates.