Molecular Dynamic Studies of Micro-voids Evolution Behavior Under Ultra Impact Loading for NiTi alloy
CUI Yehui1, ZHAO Ang2, ZENG Xiangguo1,*
1 College of Architecture and Environment, Ministry of Education Key Laboratory of Deep Earth Science and Engineering, Sichuan University, Chengdu 610065, China 2 School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China
Abstract: In this work, the molecular dynamic model of nanocrystalline NiTi was applied to explore the micro-voids evolution process under intensive impact loading. To determine the voids volume fraction inside the materials, a PYTHON code was conducted to measure voids volume during the post-process for simulation results. The voids evolution process and the micro damage mechanism of NiTi alloy were well revealed by the molecular dynamic simulation under the different parameters including impact velocity, duration time, and grain sizes. It was found that the increasing of impact velocity would promote the growth of the voids volume significantly and the transformation of damage behavior from classical spallation to micro spallation. Under the classical spallation behavior, the increasing of the impact duration time would not affect the growth rate of voids. However, it will delay the damage initial time and make the voids distribution closer to the loading boundary. Meanwhile, the simulation results also proved that the reduction of the impact duration time would make the damage behavior degenerate from the micro spallation to classical spal-lation and decrease the volume fraction of voids. Finally, the grain size effect on voids evolution was also considered in the numerical model. Under the classical spallation situation, it was discovered that the voids increasing rate would be hindered with the reduction of the grain size due to the inhibiting effect of voids growth provided by grains interaction. However, when the impact velocity increased to 3 km/s, the grain size strengthening effect would be weakened by the impact melting behavior. In this work, molecular dynamics simulation gave the microscopic description of the NiTi damage evolution process under different parameters and revealed the corresponding microscopic mechanism. The numerical results could be used for the preparation optimization of NiTi alloy and provide theoretical reference for the design of NiTi structure.
通讯作者:
* 曾祥国,四川大学建筑与环境学院博士研究生导师、土木工程博士研究生导师;四川大学建筑与环境学院教授委员会副主任。四川省力学学会常务理事。1984年毕业于重庆大学机械工程系,1987年与1996年分别在重庆大学工程力学系获得硕士和博士学位。2002年至2004年在美国Alfred大学做博士后科研工作。研究工作包括多尺度材料力学,结构完整性评价、冲击动力学、抗腐蚀材料、蠕变与松弛力学的研究。发表论文60余篇,包括Mechanics of Materials,Journal of Alloys and Compounds,International Journal of Hydrogen Energy等。xiangguozeng@scu.edu.cn
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2024, Vol. 38 
