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| 1 | Processing technique of target capsule's micro inflation hole with a scanning probe显示文摘To resolve inflation of inertial confinement fusion (ICF) target and encapsulation of micro inflation hole with adhesive, a scanning probe microscope (SPM) diamond microprobe was used as the cutting tool with SPM in contact mode. Some parameters influencing the quality of micro inflation hole, such as the scanning direction of the diamond tip, the scanning rate and the contact force are discussed. Accurate taper hole was achieved whose dimension and precision could meet the requirements of inflation and encapsulation technique of micro hole. The experimental results show that using SPM diamond microprobe as the cutting tool and with special processing technique, the precision machining of target capsule's taper inflation hole can be realized. A novel operative technology for filling high Z gas to target is provided. | SUN Tao, YAN Yongda, GAO Dangzhong, TANG Yongjian, FU Yibei & DONG ShenPrecision Engineering Research Institute, Harbin Institute of Technology, Harbin 150001, China Research Centre of Laser Fusion, Chinese Academy of Engineering Plysics, Mianyang 621900, China Institute of Nuclear Physics and Chemistry, Chinese Academy of Engineering Physics, Mianyang 621900, China | 2004 | Science China(Technological Sciences)2004，47，1： | 7 |
| 2 | CO_(2) mineralization of carbide slag for the production of light calcium carbonates显示文摘The production of polyvinyl chloride by calcium carbide method is a typical chemical process with high coal consumption,leading to massive flue gas and carbide slag emissions.Currently,the carbide slag with high CaO content is usually stacked in residue field,easily draining away with the rain and corroding the soil.In this work,we coupled the treatment of flue gas and carbide slag to propose a facile CO_(2)mineralization route to prepare light calcium carbonate.And the route feasibility was comprehensively evaluated via experiments and simulation.Through experimental investigation,the Ca^(2+) leaching and mineralization reaction parameters were determined.Based on the experiment,a process was built and optimized through Aspen Plus,and the energy was integrated to obtain the overall process energy and material consumption.Finally,the net CO_(2)emission reduction rate of the entire process through the life-cycle assessment method was analyzed.Moreover,the relationship between the parameters and the CO_(2)emission life-cycle assessment was established.The final optimization results showed that the mineralization process required 1154.69 kW·h·(t CO_(2))^(-1) of energy(including heat energy of 979.32 kW·h·(t CO_(2))^(-1) and electrical energy of 175.37 kW·h·(t CO_(2))^(-1)),and the net CO_(2)emission reduction rate was 35.8%.The light CaCO_(3)product can be sold as a high value-added product.According to preliminary economic analysis,the profit of mineralizing can reach more than 2,100 CNY·(t CO_(2))^(-1). | Tongyang Zhang Guanrun Chu Junlin Lyu Yongda Cao Wentao Xu Kui Ma Lei Song Hairong Yue Bin Liang | 2022 | Chinese Journal of Chemical Engineering2022，35，3： | 4 |
| 3 | Fabrication of Periodic Nanostructures Using AFM Tip-Based Nanomachining:Combining Groove and Material Pile-Up Topographies显示文摘This paper presents an atomic force microscopy(AFM)tip-based nanomachining method to fabricate periodic nanostructures.This method relies on combining the topography generated by machined grooves with the topography resulting from accumulated pile-up material on the side of these grooves.It is shown that controlling the distance between adjacent and parallel grooves is the key factor in ensuring the quality of the resulting nanostructures.The presented experimental data show that periodic patterns with good quality can be achieved when the feed value between adjacent scratching paths is equal to the width between the two peaks of material pile-up on the sides of a single groove.The quality of the periodicity of the obtained nanostructures is evaluated by applying one-and two-dimensional fast Fourier transform(FFT)algorithms.The ratio of the area of the peak part to the total area in the normalized amplitude–frequency characteristic diagram of the cross-section of the measured AFM image is employed to quantitatively analyze the periodic nanostructures.Finally,the optical effect induced by the use of machined periodic nanostructures for surface colorization is investigated for potential applications in the fields of anti-counterfeiting and metal sensing. | Yanquan Geng Yongda Yan Jiqiang Wang Emmanuel Brousseau Yanwen Sun Yazhou Sun | 2018 | Engineering2018，4，6： | 3 |
| 4 | Cutting path-dependent machinability of SiCp/Al composite under multi-step ultra-precision diamond cutting显示文摘Particle-tool interactions,which govern the synergetic deformation of SiC particle reinforced Al matrix composites under mechanical machining,strongly depend on the geometry of particle position residing on cutting path.In the present work,we investigate the influence of cutting path on the machinability of a SiCp/Al composite in multi-step ultra-precision diamond cutting by combining finite element simulations with experimental observations and characterization.Be consistent with experimentally characterized microstructures,the simulated SiCp/Al composite is considered to be composed of randomly distributed polygonally-shaped SiC particles with a volume fraction of 25 vol%.A multi-step cutting strategy with depths of cut ranging from 2 to 10 lm is adopted to achieve an ultimate depth of cut of 10 lm.Intrinsic material parameters and extrinsic cutting conditions utilized in finite element simulations of SiCp/Al cutting are consistent with those used in corresponding experiments.Simulation results reveal different particle-tool interactions and failure modes of SiC particles,as well as their correlations with machining force evolution,residual stress distribution and machined surface topography.A detailed comparison between numerical simulation results and experimental data of multi-step diamond cutting of SiCp/Al composite reveals a substantial impact of the number of cutting steps on particle-tool interactions and machined surface quality.These findings provide guidelines for achieving high surface finish of SiCp/Al composites by ultra-precision diamond cutting. | Shijin LU Junjie ZHANG Zengqiang LI Jianguo ZHANG Xiaohui WANG Alexander HARTMAIER Jianfeng XU Yongda YAN Tao SUN | 2021 | Chinese Journal of Aeronautics2021，34，4： | 3 |
| 5 | A Simulated Investigation of Ductile Response of GaAs in Single-Point Diamond Turning and Experimental Validation显示文摘In this paper,molecular dynamic(MD)simulation was adopted to study the ductile response of single-crystal GaAs during single-point diamond turning(SPDT).The variations of cutting temperature,coordination number,and cutting forces were revealed through MD simulations.SPDT experiment was also carried out to qualitatively validate MD simulation model from the aspects of normal cutting force.The simulation results show that the fundamental reason for ductile response of GaAs during SPDT is phase transition from a perfect zinc blende structure(GaAs-I)to a rock-salt structure(GaAs-II)under high pressure.Finally,a strong anisotropic machinability of GaAs was also found through MD simulations. | Pengfei Fan Fei Ding Xichun Luo Yongda Yan Yanquan Geng Yuzhang Wang | 2020 | Nanomanufacturing and Metrology2020，3，4： | 2 |
| 6 | The interaction between grain boundary and tool geometry in nanocutting of a bi-crystal copper显示文摘Anisotropy is one central influencing factor on achievable ultimate machined surface integrity of metallic materials.Specifically,grain boundary has a strong impact on the deformation behaviour of polycrystalline materials and correlated material removal at the microscale.In the present work,we perform molecular dynamics simulations and experiments to elucidate the underlying grain boundaryassociated mechanisms and their correlations with machining results of a bi-crystal Cu under nanocutting using a Berkovich tool.Specifically,crystallographic orientations of simulated bi-crystal Cu with a misorientation angle of 44.1°are derived from electron backscatter diffraction characterization of utilized polycrystalline copper specimen.Simulation results reveal that blocking of dislocation motion at grain boundaries,absorption of dislocations by grain boundaries and dislocation nucleation from grain boundaries are operating deformation modes in nanocutting of the bi-crystal Cu.Furthermore,heterogeneous grain boundary-associated mechanisms in neighbouring grains lead to strong anisotropic machining behaviour in the vicinity of the grain boundary.Simulated machined surface morphology and machining force evolution in the vicinity of grain boundary qualitatively agree well with experimental results.It is also found that the geometry of Berkovich tool has a strong impact on grain boundary-associated mechanisms and resultant ploughing-induced surface pile-up phenomenon. | Zhanfeng Wang Tao Sun Haijun Zhang Guo Li Zengqiang Li Junjie Zhang Yongda Yan Alexander Hartmaier | 2019 | International Journal of Extreme Manufacturing2019，1，4： | 2 |
| 7 | Detwinning-induced reduction in ductility of twinned copper nanowires显示文摘Detwinning is a unique deformation mechanism of nanotwinned metals with twin lamellae thickness down to a few nanometers.In this work we investigate the impact of detwinning mechanism on the tensile ductility of twinned Cu nanowires containing high density of parallel twin boundaries by means of molecular dynamics simulations.Simulation results show that the fracture strain of twinned Cu nanowires has a strong dependence on twin boundary spacing,resulting from the competition between individual deformation modes.Particularly for the twinned Cu nanowires containing the thinnest twin lamellaes,the dominant detwinning mechanism leads to a significant reduction in the tensile ductility.It is found that detwinning originates from twin boundary migration,which is a result of the glide of lattice partial dislocations on the twin planes.This work advances our fundamental understanding of the twin boundary-related mechanical properties of twinned metallic nanowires. | ZHANG JunJie XU FangDa YAN YongDa SUN Tao | 2013 | Chinese Science Bulletin2013，58，6： | 2 |
| 8 | Anisotropy-Related Machining Characteristics in Ultra-Precision Diamond Cutting of Crystalline Copper显示文摘Deformation behavior at grain levels greatly affects the machining characteristics of crystalline materials.In the present work,we investigate the influence of material anisotropy on ultra-precision diamond cutting of single crystalline and polycrystalline copper by experiments and crystal plasticity finite element simulations.Specifically,diamond turning and in situ SEM orthogonal cutting experiments are carried out to provide direct experimental evidence of the material anisotropy-dependent cutting results in terms of machined surface morphology and chip profile.Corresponding numerical simulations with the analysis of built stress further validate experimental results and reveal the mechanisms governing the material anisotropy influence.The above findings provide insight into the fabrication of ultra-smooth surfaces of polycrystalline metals by ultraprecision diamond turning. | Zhanfeng Wan Junjie Zhang Guo Li Zongwei Xu Haijun Zhang Jianguo Zhang Alexander Hartmaier Fengzhou Fang Yongda Yan Tao Sun | 2020 | Nanomanufacturing and Metrology2020，3，2： | 2 |
| 9 | Culture and neural differentiation of rat bone marrow mesenchymal stem cells in vitro 显示文摘 | Lei Z Yongda L Jun M | 2007 | Cell Biol Int2007，31，9： | 1 |
| 10 | Culture and neural differentiation of rat hone marrow mesenchymal stem cells invitro 显示文摘 | Lei Z Yongda L Jun M | 2007 | Cell BiolInt2007，31，9： | 1 |
| 11 | Secure group communication using robust contributory key agreement 显示文摘 | Yair A Yongdae K Cristina N R | 2004 | IEEE Transactions on Parallel and Distributed Systems2004，15，5： | 1 |
| 12 | Culture and neural differentiation of rat bone marrow mesenchymal stem cells in vitro 显示文摘 | Lei Z Yongda L Jun M | 2007 | CellBiol Int2007，31，9： | 1 |
| 13 | Group key agreement efficient in communication 显示文摘 | Yongdae K Adrian P Gene T | 2004 | IEEE Transactions on Computers2004，53，7： | 1 |
| 14 | Culture and neural differentiation of rat bone marrow mesenchymal stem cells in vitro 显示文摘 | Lei Z Yongda L Jun M | 2007 | Cell Biol Int2007，31，9： | 1 |
| 15 | Grey-econometrics com-bined model显示文摘 | Liu Sifeng Zhu Yongda | 1996 | The Journal of Grey System1996，8，1： | 1 |
| 16 | Design and Implementation of a Secure Multi-agent Marketplace显示文摘 | Ashutosh J Yongdae K Maria G | 2004 | Electronic Commerce Research and Applications2004，3，4： | 1 |
| 17 | Tree-based group key agreement显示文摘 | Yongdae K Perrig A Tsudik G | 2004 | ACM Transaction on Information and System Securiy2004，7，1： | 1 |
| 18 | Finite Element Investigation of the Influence of SiC Particle Distribution on Diamond Cutting of SiCp/AI Composites显示文摘Characteristics of internal microstructures have a strong impact on the properties of particulate reinforced metal composites.In the present work,we perform finite element simulations to elucidate fundamental mechanisms involved in the ultraprecision orthogonal cutting of aluminum-based silicon carbide composites(SiCp/AI),with an emphasis on the influence of particle distribution characteristic.The SiCp/AI composite with a particle volume fraction of 25 vol%and a mean particle size of 10|im consists of randomly distributed polygon-shaped SiC particles,the elastic deformation and brittle failure of which are described by the brittle cracking model.Simulation results reveal that in addition to metal matrix tearing,cuttinginduced particle deformation in terms of dislodging,debonding,and cracking plays an important role in the microscopic deformation and correlated machining force variation and machined surface integrity.It is found that the standard deviation of particle size to the mean value has a strong influence on the machinability of microscopic particle-tool edge interactions and macroscopically observed machining results.The present work provides a guideline for the rational synthesis of particulate-reinforced metal composites with high machinability. | Shijin Lu Zengqiang Li Junjie Zhang Jianguo Zhang Xiaohui Wang Yongda Yan Tao Sun | 2020 | Nanomanufacturing and Metrology2020，3，4： | 1 |
| 19 | Effect of differential temperature on a curved post-tensioned concrete bridge 显示文摘 | FU Yongda DEWILF J | 2004 | Advances in Structural Engineering2004，7，5： | 1 |
| 20 | Culture and Neural Differentiation of Rat Bone Marrow Mesenchymal Stem Cells in vitro 显示文摘 | Lei Z Yongda L Jun M | 2007 | Cell Biol Int(S1065- 6995)2007，31，9： | 1 |
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