【摘要】 为了研究单晶面心立方材料在纳米尺度下的拉伸变形机理,采用分子动力学方法模拟了单晶Cu的拉伸变形过程,并研究了不同温度、不同应变速率对其拉伸变形行为的影响.结果表明:不同温度对单晶Cu屈服强度影响明显,温度越高,屈服强度越低;不同应变速率对拉伸过程的弹性变形和屈服机理没有影响,但对塑性变形影响大,应变速率越大,屈服强度越大.更多还原

【Abstract】 In order to study the tension mechanisms of Fcc metals,molecular dynamics simulation was carried out on the tension process of single crystal copper,and the effects of different temperatures and strain velocities on the tensile behavior were also studied.The results show that the temperature has an obvious influence on the yield stress.The yield stress decreases obviously with the increase of temperature.And the strain velocity has no effect on the elastic behavior and yield mechanism,but has effect on the plastic behavior.With the increase of strain velocity,the tension yield stress increases accordingly.更多还原