Fundamental investigation on partially overlapped nano-cutting of monocrystalline germanium |
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| Affiliation: | 1. State Key Laboratory of Precision Measuring Technology & Instruments, Centre of MicroNano Manufacturing Technology, Tianjin University, Tianjin 300072, China;2. Center for Analysis and Measurement, Tianjin University, Tianjin 300072, China;1. State Key Laboratory of Precision Measuring Technology & Instruments, Centre of MicroNano Manufacturing Technology—MNMT, Tianjin University, 300072, China;2. Department of Nanomechanics, Tohoku University, Japan;3. Department of Mechanical Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA;4. School of Mechanical and Materials Engineering, MNMT-Dublin, University College Dublin, Dublin, Ireland;5. Department of Mechanical Engineering, Technical University of Denmark, Lyngby, Denmark;1. State Key Laboratory of Precision Measuring Technology & Instruments, Centre of MicroNano Manufacturing Technology, Tianjin University, Tianjin 300072, China;2. Institute of Mechanical Manufacturing Technology, China Academy of Engineering Physics, Sichuan 621900, China;3. School of Mechanical & Materials Engineering, MNMT-Dublin, University College Dublin, Dublin, Ireland;1. School of Mechanical and Aerospace Engineering, Queen''s University, Belfast, BT95AH, UK;2. Institute for Problems of Materials Science, National Academy of Sciences, Kyiv, 03142, Ukraine;3. Institute of Materials Science, Darmstadt University of Technology, Darmstadt, D-64287, Germany;4. CRANN Nanoscience Institute, School of Physics, Trinity College, Dublin 2, Ireland;5. Adama Innovations Limited, Dublin 2, Ireland |
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| Abstract: | Molecular dynamics simulations on partially overlapped nano-cutting of monocrystalline germanium with different feeds are carried out to investigate the surface topography, cutting force and subsurface deformation. The results indicate that the side-flow material piling up on the edges of tool marks is a decisive factor for the surface topography with the machining parameters in this study, ignoring the tool wear and machining vibration. In the partially overlapped nano-cutting, the lateral force is more affected by nominal depth of cut than by pitch feed with the value of feed being in some range. The atomic sights on the subsurface deformation show that the thickness of deformed layer after machining is much thinner than that after single cut with the same nominal depth of cut. Laser micro-Raman spectroscopy and cross-sectional transmission electron microscopy are used to detect the subsurface deformation of monocrystalline germanium after eccentric turning. The crystalline structure with defects rather than the amorphous germanium is observed in many areas of machined surface. Both molecular dynamics simulation and experimental results indicate that the amorphous-damage-less and even amorphous-damage-free machined surface can be achieved by partially overlapped nano-cutting. |
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| Keywords: | Nano-cutting Overlapped Molecular dynamics simulation Surface topography Cutting force Subsurface deformation |
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