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RISS 인기검색어
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- 저자 : Zhaolong Wang (검색결과 6 건)
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A Numerical Study of Droplet Splitting using Different Spacers Spacers in EWOD Device
Zhaolong Wang,Xiongheng Bian,Liguo Chen 한국바이오칩학회 2020 BioChip Journal Vol.14 No.3
In this paper, we investigated the droplet splitting using different spacers in the air. The droplets were manipulated by the EWOD force and the level set method was used for our numerical implementation. The results show that the property of spacer has the effect on the droplet splitting. Specifically, we showed that the re-merging occurred when split daughter droplets pass the sub-channels for the short spacer and unequal droplet splitting can be achieved for the off-centered obstacle. In the study of the thickness, the thicker spacer made the splitting process unstable. Furthermore, we found that the triangle spacer was optical for the separation from the consideration of pressure. Our task can provide some help for the design of the spacer size in the future.
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Zhaolong Lia,Baocheng Xie,Yangwei Wang 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.12
Electrochemical machining (ECM) of holes on the surface of nickel-based alloy as tool electrode was investigated to analyze the effect of electric field distribution on hole forming process in ECM of small holes. Based on the experimental and simulation results, it was shown that the law of electric field distribution in electrochemical machining gap with tubular electrode and the effect of gap electric field on dimension of hole were illustrated. In addition, the influences of electrolyte pressure on electric field distribution and stability of machining was studied to conclude the effective factors of machining stability in ECM of holes.
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Jinxin Wang,Rongsheng Jiang,Zhanwen Wu,Zhaolong Zhu,Longzhi Yang,Pingxiang Cao 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.3
Metal oxide reinforced composite, as a new kind of engineering material, was an essential research topic to industry. Magnesium oxide as particle-reinforced phase, were mixed with wood fiber-matrix to enhance the mechanical properties of composite. However, the research on the surface quality of this composite is still desirable for expanding its application. In order to investigate the surface integrity of this kind particle-reinforced wood-based composite, spiral up-milling experiments were performed with different cutting depth and cutting speed. The effect of cutting speed and cutting depth on surface integrity was investigated. According to the calculation results of black pixels proportion of binary image of machined surface, surface defects were greatly affected by cutting depth rather than cutting speed. Defects, such as pile-up and debonding of particles, were usually observed under 0.5 mm cutting depth, meanwhile, extensive damage of flacking and fracture of wood fiber-matrix were usually observed under 1.5 mm cutting depth. In all, the machined surface formation mechanism of this composite can be different by changing cutting depth.
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Pingxiang Cao,Zhaolong Zhu,Dietrich Buck,Xiaolei Guo,Mats Ekevad,Xiaodong (Alice) Wang 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.1
This study investigates the effect of rake angle on cutting performance during machining of stone-plastic composite material with diamond cutters. To that end, an orthogonal cutting experiment was designed, in which stone-plastic composite material was planed by a polycrystalline diamond (PCD) cutter to produce chips. The features studied include cutting forces, cutting heat, chip formation and cutting quality. The conclusions are as follows: Firstly, increased rake angle causes frictional force and resulting force to decrease, promoting an increase in normal force. Secondly, during planing, cutting heat is primarily distributed in the chips, with less retained in the cutting edge, and the least retained in the machined surface. The temperatures of both cutting edge and chip decline with an increase in rake angle. Thirdly, as rake angle increases, chip morphology changes from segmental to curved and then to particle chips, with chip-breaking lengths first increasing and then decreasing. Finally, an increased rake angle leads a more stable cutting process and improved cutting quality. Therefore, with the precondition of blade strength, a diamond cutter with a larger rake angle can be used to machine stone-plastic composite to improve production quality by forming a smoother machined surface.
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Jixiang Xu,Jianjun Wang,Jianping Han,Zhaolong Han,Jiahuang Tu,Zhanjie Li 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.4
The aim of this paper is to investigate the bolted end-plate beam to column (BEBC) joints with different strengthening strategies under fire through a parametric study by using a validated computational model. The current studies are mainly more focused on the mechanical behavior of a certain kind of reinforced or unreinforced BEBC joints at either room or fire alone, limiting investigations are available for a comprehensive stiffening strategy study of the BEBC joints under fire. Therefore, there is a need in improving the performance of BEBC joints with different stiffening strategies, the fire resistance comparison of these BEBC joints with different strengthening strategies under fire is of great interest. The analyses of the fire resistance behavior of the stiffened or unstiffened BEBC joints under fire were conducted by using a developed model that was established and validated by using the existing test results. A parametric study was conducted for BEBC joints with web stiffeners, end-plate stiffeners and web and end-plate stiffeners together under fire using the validated computational model. In order to better compare the fire resistance of BEBC joints with different strengthening strategies under a fire, 24 finite element models were established by considering different strengthening strategies and end-plate thicknesses. The results on different strengthening strategies and the end-plate thicknesses revealed the major impact of web stiffeners and end-plate web stiffener together, and the sensitivities of end-plate thickness for unreinforced BEBC joints. For the fire resistance of unreinforced and stiffened BEBC joints, the findings herein can provide a valuable reference for potential design recommendations.
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