钨合金力学性能表征分子动力学模拟  

Characterizations of Tungsten Alloy Mechanical Property by Molecular Dynamic Simulations

作　　者：于超[1] 任会兰[1] 宁建国[1] 

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《材料工程》2014年第10期82-89,共8页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(11172045);国家自然科学基金创新研究群体资助项目(11221202)

摘　　要：通过实验方法和分子动力学模拟方法研究了91%(质量分数,下同)细化颗粒钨合金材料的塑性力学问题。结果表明:细化钨合金材料具有应变率效应,且随着应变率的增加,屈服强度增强;钨合金材料应力-应变关系具有显著的温度效应、尺度效应和晶向效应;基于对钨合金材料的数值模拟结果与实验结果对比,得到了两种方法具有一致性的结论,证明了该MD模拟的准确性以及拟合出高应变率幂律公式的可信性。Based on the combination of experiments and numerical simulations, the plastic properties of a 91% （mass fraction, the same below） refined particle tungsten alloy were investigated. The results show that refined tungsten alloy has a strain rate effect and the yield strength increases with the increase of strain rate. The temperature effect, size effect and crystal orientation effect appear obviously in the nano-tungsten alloy materials. By comparing the numerical results and the experimental results, the conclusion obtained is two methods are in good agreement. The accurateness of this molecular dynamic simulation and the reliability of the fitted power law formula at high strain rate state are proved.

关 键 词：钨合金 应变率 分子动力学 屈服强度 数值模拟 

分 类 号：O561[理学—原子与分子物理]