纳米单晶铜板单向拉伸/压缩的分子动力学模拟

采用分子动力学方法模拟纳米单晶铜板的拉伸／压缩变形过程，得到了纳米单晶铜板在单向拉伸／压缩状态下的应力应变关系曲线和垂直于拉伸／压缩方向的泊松比．结果表明，纳米单晶铜板在单向拉伸／压缩状态下的弹性极限应变分别约为0．08和-0．03。在此范围内应力应变关系基本上表现为线弹性；垂直于拉伸／压缩方向的两个泊松比取值于0．3～0．4之间，但是不同方向上的泊松比数值不同，表现出由尺寸效应引起的材料力学行为的各向异性．

A molecular dynamics simulation of single crystalline copper nano-plate under uniaxial tensile/compressive loading

Tensile/compressive deformation processes of a single crystalline copper nano-plate were simulated by molecular dynamics. Both the tensile/compressive stress-strain relation and Poisson ratios perpendicular to the tensile/compressive direction are obtained. The extreme tensile/compressive elastic strains are shown as 0.08 and -0.03, respectively, and the stress-strain relation is nearly linear between them. The two Poisson ratios lie between 0.3 and 0.4, but they are different from each other, which exhibits anisotropy resulting from the size effect.