摘要
多尺度建模与模拟是研究金属及合金特别是纳米结构晶体材料力学性能的重要手段。最近发展的"有限温度下动态原子/离散位错耦合材料模拟方法",可进行跨原子、细观、宏观尺度的含缺陷晶体材料力学性能研究。文章应用该方法进行了微米尺寸含裂纹的fcc铝单晶材料在Ⅰ型断裂过程中的变形情况分析,获得了导致裂纹尖端发射位错的临界应力强度因子与温度及裂纹前端厚度之间的关系。
Multiscale modeling and simulation is an important method to study the mechanical properties of metals and alloys,especially nanostructured crystals.The newly developed finite-temperature dynamic coupled atomistic/discrete dislocation method can be used to study the mechanical properties of crystalline materials with defects across micro,meso and macro scales.The above method is applied to investigate the deformation process of micro-sized single crystalline fcc.aluminum with a through-thickness crack subjected to remote tensile loading.The relationship among the critical stress intensity factor of crack tip emitting dislocation thickness of crack tip and the temperature is obtained.
出处
《轻工机械》
CAS
2011年第1期85-88,93,共5页
Light Industry Machinery
基金
国家自然科学基金资助项目(10702062)
关键词
材料学
多尺度耦合
分子动力学
离散位错
有限元
materials
mulitiscale coupling
molecular dynamics
discrete dislocation
finite element method
