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Analysis micro-mechanism of burrs formation in the case of nanometric cutting process using numerical simulation method

引用

Science china(Technological Sciences) 2007年第2期50卷 129-137页

作者： han xuesong & hu yuanzhong state key laboratory of tribology, tsinghua university, beijing 100084, china state key laboratory of tribology Tsinghua University

Burrs (exit failure), being one of the important factors influencing the final precision of workpiece, have been widely studied. Today, with the development of manufacturing technology, the depth of cut falls into the range of nanometer or subnanometer, there may be some different disciplines dominating the burrs generation process. Molecular dynamics (MD) emthod, which is different from continuous mechanics, plays an important role in describing microscopic world. Take the example of single crystal copper, this paper carries out MD analysis micro-mechanism of burrs generation process. The results show that the burrs geometry depends on the type of workpiece (ductile or brittle). The depth of cut is decreased in the case of positive burrs generation process while the depth of cut is increased in case of negative burrs generation process. keywords burr - molecular dynamics - micro-mechanism Supported by china Postdoctor Science Foundation (Grant No. 20060390458)

关键词： burr molecular dynamics micro-mechanism

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Porous organic polymers: a progress report in china

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Science china Chemistry 2023年第3期66卷 620-682页

作者： Qing Hao You Tao xuesong Ding Yajie Yang Jie Feng Rui-Lei Wang Xue-Ming Chen Guan-Le Chen Xiaomeng Li huang OuYang XunLiang hu Jia Tian Bao-hang han Guangshan Zhu Wei Wang Fan Zhang Bien Tan Zhan-Ting Li Dong Wang Li-Jun Wan key laboratory of Molecular Nanostructure and Nanotechnology Beijing National Laboratory for Molecular SciencesCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China CAS key laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China key laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education and Faculty of Chemistry Northeast Normal UniversityChangchun 130024China state key laboratory of Applied Organic Chemistry College of Chemistry and Chemical EngineeringLanzhou Magnetic Resonance CenterLanzhou UniversityLanzhou 730000China School of Chemistry and Chemical Engineering State Key Laboratory of Metal Matrix CompositesShanghai Electrochemical Energy Devices Research CenterShanghai Jiao Tong UniversityShanghai 200240China key laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China key laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China Department of Chemistry Fudan UniversityShanghai 200438China university of Chinese Academy of Sciences Beijing 100049China

Porous organic polymers(POPs) are porous materials composed of light elements such as C, H, N, and O. The benign characters,including large surface area, good physical and chemical stability, well-defined chemical composition, wide ranges of monomer selection, and strong designability, have made POPs one of the frontiers in materials research. In this review, we discussed the design and synthesis of various POP materials that mainly led by Chinese scientists, including conjugated microporous polymers(CMPs), porous aromatic frameworks(PAFs), and hypercrosslinked porous polymers(HCPs), as well as crystalline POPs comprised of covalent organic frameworks(COFs) and a special class of COFs with triazine rings, covalent triazine frameworks(CTFs), and supramolecular organic frameworks(SOFs), and sorted out their main applications in adsorption, separation,catalysis, and electrochemistry fields.

关键词： Porous porous frontier

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