A5081205049- Advanced machining processes and optimization
- Advanced Surface Polishing Techniques
- Laser Material Processing Techniques
- Advanced Combustion Engine Technologies
- Tribology and Lubrication Engineering
- Tunneling and Rock Mechanics
- Advanced Measurement and Metrology Techniques
- Metallurgy and Material Forming
- Powder Metallurgy Techniques and Materials
- Refrigeration and Air Conditioning Technologies
- High-Velocity Impact and Material Behavior
- Rocket and propulsion systems research
- nanoparticles nucleation surface interactions
- Microstructure and mechanical properties
- Biodiesel Production and Applications
- Welding Techniques and Residual Stresses
- Advanced ceramic materials synthesis
- Lubricants and Their Additives
- Advanced materials and composites
- Advanced Thermodynamic Systems and Engines
- Advanced Machining and Optimization Techniques
University of Wisconsin–Madison
2018-2024
Korea Aerospace University
2020
Korea Institute of Science and Technology
2012
This paper presents the feasibility study of an oil-free turbocharger (TC) supported on gas foil bearings (GFBs) via on-road tests a 2-liter class diesel vehicle. The TC is constructed using hollow rotor with radial turbine at one end and compressor impeller other end, center housing journal thrust GFBs, casings. reuses parts commercial variable geometry turbocharger, except for rotor-bearing system. In test rig driven by vehicle engine (EG), rotordynamic performance evaluated up to speed...
In this paper, the modified slip/fracture activation model has been used in order to understand mechanism of ductile-brittle transition on R-plane sapphire during ultra-precision machining by reflecting direction resultant force. Anisotropic characteristics crack morphology and ductility depending cutting were explained detail with fracture cleavage plastic deformation parameters. Through analysis, it was concluded that morphologies mainly determined interaction multiple systems activated...
Processing ceramics like sapphire is challenging due to the brittle response exhibited during machining which poses a limitation on maximum material removal rate and throughput of process. Due this limitation, has be removed in small increments order create required form shape. This study investigates overlapping operation whether existing surface cracks can by taking advantage anisotropy sapphire. Scribing cuts were performed A- R-plane at various depths results show that even when depth...
Single-crystal sapphire can be used in various fields the industry due to its superior material properties, but it has been challenging fabricate parts with high accuracy and complexity because of hardness brittleness, which lead crack generation during machining process. Ultra-Precision Machining (UPM) studied as one solutions overcome this issue is able cut brittle ceramics ductile mode for small depth cuts. However, only a few studies have focused on force UPM single-crystal sapphire,...
With the growing demand for fabrication of microminiaturized components, a comprehensive understanding material removal behavior during ultra-precision cutting has become increasingly significant. Single-crystal sapphire stands out as promising microelectronic lenses, and semiconductor structures owing to its exceptional characteristics, such high hardness, chemical stability, optical properties. This paper focuses on mechanism responsible generating anisotropic crack morphologies along...
This paper presents the feasibility study of an oil-free turbocharger (TC) supported on gas foil bearings (GFBs) via on-road tests a 2-liter class diesel vehicle. The TC is constructed using hollow rotor with radial turbine at one end and compressor impeller other end, center housing journal thrust GFBs, casings. reuses parts commercial variable geometry except for rotor-bearing system. In test rig driven by vehicle engine (EG), rotordynamic performance evaluated up to speed 130 krpm, while...