Papers by Author: Ying Chun Liang

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Authors: Ya Zhou Sun, Yi Lei Liu, Hai Tao Liu, Ying Chun Liang
Abstract: Guide ways of ultra-precision machine tools always have sufficient stiffness and guiding precision. But guide way rails deformation caused by oil film pressure and slider offset lead to oil film clearance change which affects static stiffness and guiding precision. An inside-slider hydrostatic guide way is designed, and its static characteristics are analyzed. As a result, the effect of slider offset on stiffness and guiding precisions is obtained. A FE model of guide way is established. An elastomer of virtual material properties is used to simulate oil film, so that the relationship between oil film clearance and pressure can be represented in a certain range. Static stiffness and guiding precision are obtained considering deformation of rails.
Authors: Ying Chun Liang, Wan Qun Chen, Li Hua Lu, Ya Zhou Sun, Yang Sun
Abstract: In order to achieve the design of mechatronic system rapidly, an integrated design process is used for a hydrostatic slideway driven by linear motor. Control model of the linear motor and FE model of the slideway carriage are established, besides, force analysis of the carriage and relevant optimization are carried out. Software Simulink is used to simulate the linear feeding system. Subsequently, the advantages of the integrated design compared with traditional method are analyzed. This study could provide important insights for the design of the hydrostatic slideway with linear motor driven system.
Authors: Xing Lei Hu, Jia Xuan Chen, Ying Chun Liang
Abstract: This paper provides a review of Monte Carlo (MC) method and its applications in mechanical engineering. MC simulation is a class of computational algorithms which require repeated random sampling and statistical analysis to calculate the results. The basic principles, formulas and recent development of Monte Carlo method are firstly discussed briefly, and then the applications of MC simulations in the design and manufacturing of nanostructures are reviewed. Finally, we briefly introduce MC simulation of morphology evolution of machined surface, which come from our recent work.
Authors: Ying Chun Liang, Xing Lei Hu, Jia Xuan Chen
Abstract: Monte Carlo (MC) method is adopted to simulate the morphology evolution of machined surface. One specimen is first scratched in MD simulation, and then the machined surface is used in MC simulation. It is found that the atoms stacking on both sides of the groove in the process of nanoscratching have relative obvious migration with time, because these atoms are in high energy, unstable status. The atoms are moved to the minimum energy position by repeated Markov moves. These atoms have an average one-atom-high migration, so quality of machined surface is definitely influenced by the factor of time. To simulate morphology of machined surface by MC simulation is both practical and meaningful.
Authors: Ying Chun Liang, Hong Min Pen, Qing Shun Bai, Xing Lei Hu, Zhi Guo Wang
Abstract: In order to investigate the mechanical properties of single crystal Cu nanorod with preset defects, the multiscale unixial tension simulation models of nanorods with two different crystallographic orientations are established. In two orientations, the dislocations are emitted firstly from the notch tip. The results show that the defect evolution, stress-strain curves and train energy vary with different crystallographic orientations. In setup, the deformation is ductile mode and it is fracture fashion in the setup.
Authors: Ying Chun Liang, Xing Lei Hu, Jia Xuan Chen, Hong Min Pen
Abstract: Nanometric uniaxial tension tests of single crystal copper nanorod are simulated using multiscale simulation method, which has combined molecular dynamics (MD) and finite element method (FEM). New tension models of nanorod are constructed. Tension processes of ideal nanorod without notches and that with notches are performed to analyze their mechanical properties. Deformation mechanism of tension process is discussed in detail. Yield strength and elastic modulus are calculated according to the obtained stress-strain curves. Finally, the results show that the notches have obvious influence on the mechanical properties of copper nanorod. Due to the existence of notches, the section area of single crystal nanorod decreases by 40%; however, the yield strength and elastic modulus decreases by 39.0% and 10.2% respectively in our simulations. This research is helpful for identifying the mechanical properties of single crystal copper nanorod, and for understanding the deformation mechanism of tension process of nanorod.
Authors: Xing Lei Hu, Ying Chun Liang, Jia Xuan Chen, Hong Min Pen
Abstract: Quasicontinuum simulations of tension test of single crystal copper nanowire are performed to analyze deformation mechanism of tension process and size effects of mechanical properties. New tension models of nanowire are constructed by using quasicontinuum method, which has combined molecular dynamics and finite element method. Tension processes of three different length nanowires without notches and those with notches are simulated. Yield strength and elastic modulus are calculated according to the obtained load-displacement curves. Finally, the results show that the mechanical properties of copper nanowire have obvious size effect and the notches have obvious influence on the mechanical properties.
Authors: Yu Long Chen, Hai Tao Liu, Ya Zhou Sun, Qiang Zhang, Ying Chun Liang
Abstract: Laser cooling is one of the critical problems in the research of high power semiconductor lasers. This paper provides an overview of microchannel heat sink which is used to cool the high power semiconductor lasers. The method of polishing after cutting is the current processing method of the heat sink, which is because the ordinary cutting method cannot meet the requirements of high quality of surface and edge burrs. This paper proposes ultra-precision fly cutting method for heat sink machining to omit the polishing processing to improve the machining efficiency, and verifies by experiments that the feasibility of the processing method and the edge quality improved by workpiece superposition processing method.
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