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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 | 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 |
| 3 | 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 |
| 4 | 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 |
| 5 | 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 |
| 6 | 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 |
| 7 | 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 |
| 8 | 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 |
| 9 | The coupling effect of slow-rate mechanical motion on the confined etching process in electrochemical mechanical micromachining显示文摘By introducing the mechanical motion into the confined etchant layer technique(CELT), we have developed a promising ultraprecision machining method, termed as electrochemical mechanical micromachining(ECMM), for producing both regular and irregular three dimensional(3 D) microstructures. It was found that there was a dramatic coupling effect between the confined etching process and the slow-rate mechanical motion because of the concentration distribution of electrogenerated etchant caused by the latter. In this article, the coupling effect was investigated systemically by comparing the etchant diffusion, etching depths and profiles in the non-confined and confined machining modes. A two-dimensional(2 D) numerical simulation model was proposed to analyze the diffusion variations during the ECMM process, which is well verified by the machining experiments. The results showed that, in the confined machining mode, both the machining resolution and the perpendicularity tolerance of side faces were improved effectively. Furthermore, the theoretical modeling and numerical simulations were proved valuable to optimize the technical parameters of the ECMM process. | Lianhuan Han Yuchao Jia Yongzhi Cao Zhenjiang Hu Xuesen Zhao Shusen Guo Yongda Yan Zhongqun Tian Dongping Zhan | 2018 | Science China Chemistry2018，61，6： | 1 |
| 10 | Calculation of the intracellular elastic modulus based on an atomic force microscope micro-cutting system显示文摘Better understanding of variations in the mechanical properties of cancer cells could help to provide novel solutions for the diagnosis,prevention,and treatment of cancers.We therefore developed a calculation model of the intracellular elastic modulus based on the contact pressure between the silicon tip of an atomic force microscope and the target cells,and cutting depth.Ovarian cells(UACC-1598) and colon cancer cells(NCI-H716) were cut into sequential layers using an atomic force microscope silicon tip.The cutting area on the cells was 8μm×8μm,and the loading force acting on the cells was increased from 17.523 to 32.126μN.The elastic modulus distribution was measured after each cutting process.There were significant differences in contact pressure and cutting depth between different cells under the same loading force,which could be attributed to differences in their intrinsic structures and mechanical properties.The differences between the average elastic modulus and surface elastic modulus for UACC-1598 and NCI-H716 cells were 0.288±0.08 kPa and 0.376±0.16 kPa,respectively.These results demonstrate that this micro-cutting method can be used to measure intracellular mechanical properties,which could in turn provide a more accurate experimental basis for the development of novel methods for the diagnosis and treatment of various diseases. | YU Miao WANG JingHe WANG HongXiang LIU Li YAN YongDa ZHANG JunJie LIANG YingChun DONG Shen | 2012 | Chinese Science Bulletin2012，57，15： | 1 |
| 11 | Study on effects of the feed on AFM- based nano-scratching process using MD simulation 显示文摘 | Yongda Yan Tao Sun Shen Dong | 2007 | Computational Materials Science2007，40，1： | 1 |
| 12 | Molecular dynamics study of scratching velocity dependency in AFM-based nanometric scratching process显示文摘 | Junjie Zhang Tao Sun Yongda Yan Yingchun Liang | 2008 | Materials Science & Engineering A2008，，1： | 1 |
| 13 | Study on effects of the feed on AFM-based nano-scratching process using MD simulation显示文摘 | Yongda Yan Tao Sun Shen Dong Yingchun Liang | 2006 | Computational Materials Science2006，，1： | 1 |
| 14 | Tip-Based Nanomachining on Thin Films:A Mini Review显示文摘As one of the most widely used nanofabrication methods,the atomic force microscopy(AFM)tip-based nanomachining technique offers important advantages,including nanoscale manipulation accuracy,low maintenance cost,and flexible experimental operation.This technique has been applied to one-,two-,and even three-dimensional nanomachining patterns on thin films made of polymers,metals,and two-dimensional materials.These structures are widely used in the fields of nanooptics,nanoelectronics,data storage,super lubrication,and so forth.Moreover,they are believed to have a wide application in other fields,and their possible industrialization may be realized in the future.In this work,the current state of the research into the use of the AFM tip-based nanomachining method in thin-film machining is presented.First,the state of the structures machined on thin films is reviewed according to the type of thin-film materials(i.e.,polymers,metals,and two-dimensional materials).Second,the related applications of tip-based nanomachining to film machining are presented.Finally,the current situation of this area and its potential development direction are discussed.This review is expected to enrich the understanding of the research status of the use of the tip-based nanomachining method in thin-film machining and ultimately broaden its application. | Shunyu Chang Yanquan Geng Yongda Yan | 2022 | Nanomanufacturing and Metrology2022，5，1： | 0 |
| 15 | Insight into Atomic-Scale Adhesion at the C-Cu Interface During theInitial Stage of Nanoindentation显示文摘Adhesion is a common phenomenon in nanomachining which affects processing accuracy and repeatability.As material removal approaches the atomic or close-to-atomic scale,quantum mechanics becomes the dominant principle behind the atomic-level interaction.However,atomic-scale effects cannot be properly described by empirical potential function-based molecular dynamics simulations.This study uses a first-principles method to reveal the atomic-scale adhesion between a diamond tip and a copper slab during initial-stage nanoindentation.Using a simplified tip and slab model,adhesion energy,electronic distribution,and density of states are analyzed based on quantum chemistry calculation.Results show that atomic adhesion is primarily due to the covalent bonding interaction between C and Cu atoms,which can induce structural changes to the diamond tip and copper slab.The effects of tip position and angles on adhesion are further studied through a series of simulations.The results show that adhesion between the tip and slab is sensitive to the lattice structure and a variant in angstroms is enough to cause different adhesion and structural changes.The actual determinants of adhesion can only be the atomic and electronic structures at the tip-slab interface.Bond rotation and breakage are observed during simulation and their effects on adhesion are further discussed.To conclude,the first-principles method is important for the analysis of an atomic-scale interaction system,even if only as an aid to describing adhesion at atomic and electronic scales. | Jian Gao Xichun Luo Wenlong Chang Zhengjian Wang Yongda Yan Yanquan Geng | 2022 | Nanomanufacturing and Metrology2022，5，3： | 0 |
| 16 | Nontraditional manufacturing technique——Nano machining technique based on SPM显示文摘Nano machining based on SPM is a novel, nontraditional advanced manufacturing technique. There are three main machining methods based on SPM, i.e.single atom manipulation, surface modification using physical or chemical actions and mechanical scratching. The current development of this technique is summarized. Based on the analysis of mechanical scratching mechanism, a 5 μm micro inflation hole is fabricated on the surface of inertial confinement fusion (ICF) target. The processing technique is optimized. The machining properties of brittle material, single crystal Ge, are investigated. A micro machining system combining SPM and a high accuracy stage is developed. Some 2D and 3D microstructures are fabricated using the system. This method has broad applications in the field of nano machining. | DONG Shen YAN Yongda SUN Tao LIANG Yingchun CHENG Kai | 2004 | Science China(Physics,Mechanics & Astronomy)2004，47，z1： | 0 |
| 17 | Study of machining indentations over the entire surface of a target ball using the force modulation approach显示文摘A modified five-axis cutting system using a force control cutting strategy was to machine indentations in different annuli on the entire surface of a target ball.The relationship between the cutting depths and the applied load as well as the microsphere rotation speed were studied experimentally to reveal the micromachining mechanism.In particular,aligning the rotating center of the high precision spindle with the microsphere center is essential for guaranteeing the machining accuracy of indentations.The distance between adjacent indentations on the same annulus and the vertical distance between adjacent annuli were determined by the rotating speed of the micro-ball and the controllable movement of the high-precision stage,respectively.In order to verify the feasibility and effect of the proposed cutting strategy,indentations with constant and expected depths were conducted on the entire surface of a hollow thin-walled micro-ball with a diameter of 1 mm.The results imply that this machining methodology has the potential to provide the target ball with desired modulated defects for simulating the inertial confinement fusion implosion experiment. | Yuzhang Wang Yanquan Geng Guo Li Jiqiang Wang Zhuo Fang Yongda Yan | 2021 | International Journal of Extreme Manufacturing2021，3，3： | 0 |
| 18 | Towards understanding the surface rippling process by periodic reciprocal nanoscratching显示文摘The bundle structure formed perpendicular to the scratching direction is a type of wear-induced structure for thermoplastics.In this study,the formation mechanism of bundle structures on polycarbonate(PC)surfaces is investigated by reciprocal scratching experiments.Based on the analysis of the morphologies,friction forces,and height signals,the formation of the bundle structure is reproduced.The influence of scratching parameters,including the feed value and scratching direction,on the formation of the bundle structure is also studied.It is found that the bundle structure is accumulated by the continuous stacking of the sample materials plowed by the tip in stick–slip motion,and that the stick–slip behavior is enhanced with increased scratching times.This work reproduces the formation process of bundle structure in experiments for the first time and demonstrates that the stick–slip enhancement mechanism exists in the reciprocal scratching process,providing further insight into the friction behavior of polymers. | Zihan LI Yongda YAN Jiqiang WANG Chen LI Yanquan GENG | 2023 | Friction2023，11，10： | 0 |
| 19 | Fabrication of Ordered Micro/Nanostructures Using Probe‑Based Force‑Controlled Micromachining System显示文摘This paper presents a probe-based force-controlled nanoindentation method to fabricate ordered micro/nanostructures.Both the experimental and finite element simulation approaches are employed to investigate the influence of the interval between the adjacent indentations and the rotation angle of the probe on the formed micro/nanostructures.The non-contacting part between indenter and the sample material and the height of the material pile-up are two competing factors to determine the depth relationship between the adjacent indentations.For the one array indentations,nanostructures with good depth consistency and periodicity can be formed after the depth of the indentation becoming stable,and the variation of the rotation angle results in the large difference between the morphology of the formed nanostructures at the bottom of the one array indentation.In addition,for the indentation arrays,the nanostructures with good consistency and periodicity of the shape and depth can be generated with the spacing greater than 1μm.Finally,Raman tests are also carried out based on the obtained ordered micro/nanostructures with Rhodamine probe molecule.The indentation arrays with a smaller spacing lead to better the enhancement effect of the substrate,which has the potential applications in the fields of biological or chemical molecular detection. | Yanquan Geng Yuzhang Wang Jianxiong Cai Jingran Zhang Yongda Yan | 2022 | Chinese Journal of Mechanical Engineering2022，35，6： | 0 |
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