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Expressions for Differential and Apparent Coefficients of Static Friction

Wang Weiyuan

Strategic Study of CAE 2001, Volume 3, Issue 8,   Pages 29-32

Abstract:

Recently, scientists and engineers are interested in coefficients of static friction on micro andnano scale.On macro scale, the friction force is proportional to load, the apparent coefficients of static frictionforce microscope on micro or nano scale showed that Amontons' laws can not used successfully.between the coefficients of static friction and the load.

Keywords： differential coefficients of static friction     coefficients of static friction on micro or nano scale     apparentcoefficients of static friction     coefficients of static friction on macro scale    

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Strengthening of polysulfone membranes using hybrid mixtures of micro- and nano-scale modifiers

Peyman P. Selakjani, Majid Peyravi, Mohsen Jahanshahi, Hamzeh Hoseinpour, Ali S. Rad, Soodabeh Khalili

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 1,   Pages 174-183 doi: 10.1007/s11705-017-1670-y

Abstract: Polysulfone (PSf) membranes were modified by either a new organic modifier (sulfonated poly(ether sulfide sulfone), SPESS) or a traditional modifier (rice hulk). These membranes were further reinforced with either multi-walled carbon nanotubes (MWCNTs) or silica nanoparticles. Having a dye rejection of 98.46%, the reinforced membranes increased more than 50% in strength but no change in solution flux was observed. The morphological and roughness studies were conducted using scanning electron microscopy and atomic force microscopy. Moreover, the PSF membranes were also characterized by differential scanning calorimetry. Modifying the membranes with organic modifier or nanofiller increases the glass transition temperature ( ). The highest and strength were observed for the PSf-SPESS-MWCNT membrane. SPESS decreases surface roughness but MWCNT increases roughness on the nanoscale. All membranes show a bimodal pore size distribution, whereas the PSf-SPESS-MWCNT membrane exhibits a relatively uniform distribution of macroscopic and microscopic pores.

Keywords： polysulfone membrane     mechanical properties     micro- and nano-modification     binary and ternary system     dye    

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Effect of friction coefficients on the dynamic response of gear systems

Lingli JIANG, Zhenyong DENG, Fengshou GU, Andrew D. BALL, Xuejun LI

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 3,   Pages 397-405 doi: 10.1007/s11465-017-0415-4

Abstract: The change in the lubrication conditions is modeled by the changes in the friction coefficients, therebydemonstrated by the mean and root mean square values calculated by the simulated responses under different frictioncoefficients.

Keywords： dynamic response     friction coefficient     wind loads     wind turbine gearbox    

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Modeling of the minimum cutting thickness in micro cutting with consideration of the friction around

Tianfeng ZHOU, Ying WANG, Benshuai RUAN, Zhiqiang LIANG, Xibin WANG

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 1,   Pages 81-88 doi: 10.1007/s11465-019-0561-y

Abstract: Friction modeling between the tool and the workpiece plays an important role in predicting the minimumcutting thickness during TC4 micro machining and finite element method (FEM) cutting simulation.around the friction zone in micro cutting; estimate the stress distributions on the rake, edge, andMicro cutting experiments are conducted to validate the accuracy of the friction and the minimum cuttingstress on the tool surface, thereby validating the modeling method of the minimum cutting thickness in micro

Keywords： tool friction     minimum cutting thickness     finite element method     tool edge radius     micro cutting    

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A multi-probe micro-fabrication apparatus based on the friction-induced fabrication method

Zhijiang WU, Chenfei SONG, Jian GUO, Bingjun YU, Linmao QIAN

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 4,   Pages 333-339 doi: 10.1007/s11465-013-0276-4

Abstract:

A novel multi-probe micro-fabrication apparatus was developed based on the friction-induced fabricationThrough locating steel micro balls into indents array, the preparation of multi-probe array can be realizedCombining the friction-induced scanning with selective etching in KOH solution, various micro-patternsAs a low-cost and high efficiency fabrication device, the multi-probe micro-fabrication apparatus mayencourage the development of friction-induced fabrication method and shed new light on the texture engineering

Keywords： friction-induced fabrication     silicon     surface texture     friction     multi-probe    

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Bicontinuous porous membranes with micro-nano composite structure using a facile atomization-assisted

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 8,   Pages 1268-1280 doi: 10.1007/s11705-022-2143-5

Abstract: The micro-nano composite structure can endow separation membranes with special surface properties, butBy using this method, a bicontinuous porous microfiltration membrane with robust micro-nano compositeThe formation mechanism of the micro-nano composite structure was proposed.hydrogen bonding between polyacrylonitrile and polyvinylpyrrolidone molecules should have resulted in the nano-protrusionsFurthermore, the scale-up verification from laboratory preparation to continuous production has been

Keywords： atomization     nonsolvent induced phase separation     bicontinuous porous structure     micro-nano composite    

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Effects of leakage and friction on the miniaturization of a Wankel compressor

Yilin ZHANG, Wen WANG

Frontiers in Energy 2011, Volume 5, Issue 1,   Pages 83-92 doi: 10.1007/s11708-010-0125-7

Abstract: This paper presents a numerical simulation of the performance of a meso-scale Wankel compressor and discussesThe discussion is related to the effect of leakage and friction on the design limit (cooling capacityThe largest friction originates from the clearance among the end face of the eccentric shaft, the endThe rational design cooling capacity limit for the meso-scale Wankel compressor is approximately 4 W.

Keywords： meso-scale     Wankel compressor     leakage     friction    

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Recent advances in micro- and nano-machining technologies

Shang GAO, Han HUANG

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 1,   Pages 18-32 doi: 10.1007/s11465-017-0410-9

Abstract: The miniaturization of devices in different fields requires production of micro- and nano-scale componentsThis paper reviewed the recent advances in micro- and nano-machining technologies, including micro-cutting, micro-electrical-discharge machining, laser micro-machining, and focused ion beam machining.

Keywords： micro machining     cutting     electro discharge machining (EDM)     laser machining     focused ion beam (FIB)    

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Recent advances in ultrasonic-assisted machining for the fabrication of micro/nano-textured surfaces

Shaolin XU,Tsunemoto KURIYAGAWA,Keita SHIMADA,Masayoshi MIZUTANI

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 1,   Pages 33-45 doi: 10.1007/s11465-017-0422-5

Abstract: this paper, the state of art of ultrasonic-assisted machining technologies used for fabrication of micro/nano-textured surfaces is reviewed.Finally, the challenges in using the RUT method to fabricate micro/nano-textured surfaces are discussed

Keywords： ultrasonic-assisted machining     textured surface     micro/nano-structures     functional performance    

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Fabrication of micro/nano-structures by electrohydrodynamic jet technique

Dazhi WANG, Xiaojun ZHAO, Yigao LIN, Tongqun REN, Junsheng LIANG, Chong LIU, Liding WANG

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 4,   Pages 477-489 doi: 10.1007/s11465-017-0461-y

Abstract:

Electrohydrodynamic jet (E-Jet) is an approach to the fabrication of micro/nano-structures by theincludes E-Jet deposition and E-Jet printing, has a wide range of applications in the fabrication of micro/nano-structures for micro/nano-electromechanical system devices.This technique is also considered a micro/nano-fabrication method with a great potential for commercial

Keywords： electrohydrodynamic jet deposition     electrohydrodynamic jet printing     micro/nano-structures     film    

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Numerical simulation of micro scale flowing and boiling

Wen WANG, Rui ZHUAN,

Frontiers in Energy 2009, Volume 3, Issue 4,   Pages 396-401 doi: 10.1007/s11708-009-0049-2

Abstract: Numerical simulations of flowing and boiling in micro channels are presented, including the modelingThe simulated results also show the details of 3-dimensional heat transfer and the flow in micro channels, which are helpful to the investigation of the mechanism of two-phase heat transfer and flow in micro

Keywords： volume-of-fluid (VOF)     micro channel     nucleate boiling     bubble dynamics     simulation    

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Optimizing the compressive strength of concrete containing micro-silica, nano-silica, and polypropylene

Fatemeh ZAHIRI, Hamid ESKANDARI-NADDAF

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 4,   Pages 821-830 doi: 10.1007/s11709-019-0518-6

Abstract: Many studies have evaluated the effects of additives such as nano-silica (NS), micro-silica (MS) and

Keywords： mixture method     compressive strength     nano-silica     micro-silica     polypropylene fibers    

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Laboratory and field evaluation of asphalt pavement surface friction resistance

Zhong WU, Chris ABADIE

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 3,   Pages 372-381 doi: 10.1007/s11709-017-0463-1

Abstract:

Pavement surface friction is a significant factor for driving safety and plays a critical role inHowever, the current asphalt mixture design procedure does not directly consider friction as a requirementThe objective of this study was to develop a surface friction prediction model that can be used duringwere evaluated in laboratory using an accelerated polishing and testing procedure considering both microon twenty-two selected asphalt pavement sections using different in situ devices including Dynamic Friction

Keywords： friction skid resistance     polishing     PSV     LWST     micro-texture     macro-texture    

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Dynamical research on spherical micro actuator with piezoelectric ceramic stacks drivers

ZHANG Ruihua, CHEN Haichu

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 4,   Pages 433-438 doi: 10.1007/s11465-007-0074-y

Abstract: with a micro-gripper based on the sample spherical micro actuator, and the experimental research onthe micro assembly is conducted between a micro shaft of 180 μm and a micro spindle sleeve of 200 μm.of the micro actuator, driving signal frequency, friction coefficient of the contact surface betweenthe metal sphere and the friction block of the micro driving unit are analyzed.micro operation and assembly for micro electro mechanical systems (MEMS) or other microelements in micro

Keywords： spherical     micro-gripper     friction coefficient     dynamic     frequency    

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The effect of doping and steam treatment on the catalytic activities of nano-scale H-ZSM-5 in the methanol

Baodong Song, Yongqiang Li, Gang Cao, Zhenhai Sun, Xu Han

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 4,   Pages 564-574 doi: 10.1007/s11705-017-1654-y

Abstract: The catalytic activities of steam-treated and non-steam-treated nano-scale H-ZSM-5 (NHZ5) catalysts impregnated

Keywords： MTG     nano-scale H-ZSM-5     steam treatment     gasoline     selectivity to gasoline    

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Title Author Date Type Operation

Expressions for Differential and Apparent Coefficients of Static Friction

Wang Weiyuan

Journal Article

Strengthening of polysulfone membranes using hybrid mixtures of micro- and nano-scale modifiers

Peyman P. Selakjani, Majid Peyravi, Mohsen Jahanshahi, Hamzeh Hoseinpour, Ali S. Rad, Soodabeh Khalili

Journal Article

Effect of friction coefficients on the dynamic response of gear systems

Lingli JIANG, Zhenyong DENG, Fengshou GU, Andrew D. BALL, Xuejun LI

Journal Article

Modeling of the minimum cutting thickness in micro cutting with consideration of the friction around

Tianfeng ZHOU, Ying WANG, Benshuai RUAN, Zhiqiang LIANG, Xibin WANG

Journal Article

A multi-probe micro-fabrication apparatus based on the friction-induced fabrication method

Zhijiang WU, Chenfei SONG, Jian GUO, Bingjun YU, Linmao QIAN

Journal Article

Bicontinuous porous membranes with micro-nano composite structure using a facile atomization-assisted

Journal Article

Effects of leakage and friction on the miniaturization of a Wankel compressor

Yilin ZHANG, Wen WANG

Journal Article

Recent advances in micro- and nano-machining technologies

Shang GAO, Han HUANG

Journal Article

Recent advances in ultrasonic-assisted machining for the fabrication of micro/nano-textured surfaces

Shaolin XU,Tsunemoto KURIYAGAWA,Keita SHIMADA,Masayoshi MIZUTANI

Journal Article

Fabrication of micro/nano-structures by electrohydrodynamic jet technique

Dazhi WANG, Xiaojun ZHAO, Yigao LIN, Tongqun REN, Junsheng LIANG, Chong LIU, Liding WANG

Journal Article

Numerical simulation of micro scale flowing and boiling

Wen WANG, Rui ZHUAN,

Journal Article

Optimizing the compressive strength of concrete containing micro-silica, nano-silica, and polypropylene

Fatemeh ZAHIRI, Hamid ESKANDARI-NADDAF

Journal Article

Laboratory and field evaluation of asphalt pavement surface friction resistance

Zhong WU, Chris ABADIE

Journal Article

Dynamical research on spherical micro actuator with piezoelectric ceramic stacks drivers

ZHANG Ruihua, CHEN Haichu

Journal Article

The effect of doping and steam treatment on the catalytic activities of nano-scale H-ZSM-5 in the methanol

Baodong Song, Yongqiang Li, Gang Cao, Zhenhai Sun, Xu Han

Journal Article