Materials Reports  2019, Vol. 33 Issue (Z2): 419-423 |
| METALS AND METAL MATRIX COMPOSITES |
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| Simulation on Nano-cutting Process of Gradient Nano-crystalline Copper withMolecular Dynamics Method |
| WANG Ziyun, ZHAO Pengyue, GUO Yongbo, ZHANG Kai, WANG Kang
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| Center for Precision Engineering (Harbin Institute of Technology), Harbin 150001 |
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Abstract Due to the excellent plasticity and strength properties, gradient nanocrystalline metal materials are suitable for the manufacture material of micro-nanometer systems and have gradually become a research hotspot in recent years. In order to study the processing and removal mechanism of gradient polycrystalline materials, the Poisson-Voronoi method is used to build a large-scale gradient polycrystalline copper molecular dynamics model and simulate the nano-cutting process of gradient polycrystalline copper. The cutting force, defect and stress of cutting fine crystal layer (process 1) between cutting coarse crystal layer (process 2) are compared and analyzed. The results show that the cutting force of process 1 is obviously less than that of process 2, and the cutting force of process 2 fluctuates greatly. Comparing the number and distribution of defects in the whole cutting process, it is found that the number of defects in process 2 is higher than that in process 1. The forming process of defects around the tool is analyzed in detail. It is found that the defects of process 1 are mainly formed and diffused before the tool, and the defects of process 2 are mainly formed and diffused before the tool and at the bottom of the tool. In stress analysis, it is found that the equivalent stress of process 2 is greater than that of process 1. The research has a certain reference value for nano-cutting process of gradient nano-crystalline copper.
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Published: 25 November 2019
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51535003,51775146). |
About author:: Ziyun Wang, master of School of Mechatronics Engineering, Harbin Institute Technology. His study is the research of nano-cutting simulation by molecular dyna-mics.
Yongbo Guo, professor,doctoral supervisor and director assistant of Institute of Precision Engineering, Harbin Institute of Technology. He hosted the National Na-tural Science Foundation of China youth fund and surface projects, high-end CNC machine tools and basic manufacturing equipment 04 projects, 921 projects, China Post-doctoral Special Subsidy, China Post-doctoral Foundation (First Class) and other vertical scientific research projects, as well as a number of manned spaceflight, ultra-high speed wind tunnel and other horizontal scientific research
projects. And in the past five years, he has been responsible for more than 70 million yuan in research funding. As the first person in charge, he won the second prize of Heilongjiang Science and Technology Progress, the National Excellent Doctoral Dissertation Award of Shangyin Machinery, and the Excellent Doctoral Dissertation of Harbin University of Technology. He participated in editing one monograph, applied for more than 10 national invention patents and authorized 10. Published academic papers in Acta Materialia, Applied Physics Letters, Philosophical Magazine, Chinese Journal of Science and Metals and other well-known international academic conferences such as European Precision Engineering and Nanotechnology EUSPEN and ASPEN. |
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