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Tribological behavior of co-textured cylinder liner-piston ring during running-in

Friction 2022年第6期10卷 878-890页

作者： Chenwei MIAO Zhiwei GUO chengqing yuan School of Energy and Power Engineering Wuhan University of TechnologyWuhan 430063China Reliability Engineering Institute National Engineering Research Center for Water Transportation SafetyWuhan 430063China

The running-in of cylinder liner-piston rings(CLPRs)is the most important process that must be performed before a marine diesel engine can be *** quality of running-in directly affects the reliability of a *** surface texture of a CLPR has been proven to significantly affect its lubrication *** this study,the tribological behavior of a CLPR during running-in is *** types of surface textures are generated on the CLPR via laser processing:dimple texture on piston rings,groove texture on cylinder liners,and co-texture on both ***,a series of tests are performed on a slice tester.A load of 300 N(1.64 MPa) is applied,and two speeds(50 and 100 rpm)are *** CLPR running-in quality is characterized based on three parameters,i.e.,the friction coefficient,contact resistance,and wear *** results show that,compared with a non-textured surface,the three types of surface textures mentioned above improved the friction performance during *** lubricant supply capacity of the dimple texture on the piston ring,as a mobile oil reservoir,is stronger than that of the groove texture on the cylinder liner serving as a static oil *** contrast,the wear resistance of the dimple texture,as a movable debris trap on the piston ring,is weaker than that of the groove texture on the cylinder liner,which serves as a static debris *** is demonstrated that the co-texture combines the advantages of dimples and groove *** with non-textured surfaces,the friction coefficient decreased the most at 100 rpm(44.5%),and the contact resistance improved the most at 50 rpm(352.9%).The coupling effect provides the surface with improved running-in quality by optimizing the tribological performance,particularly at the dead *** study provides guidance for the tribological design and manufacturing of CLPR in marine diesel engines.

关键词： marine diesel engine cylinder liner-piston ring running-in process co-texture tribological performance

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Insight into the Lubrication Performance of Biomimetic Porous Structure Material for Water-lubricated Bearings

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Journal of Bionic Engineering 2023年第5期20卷 1905-1916页

作者： Xuefei Li Zhiwei Guo Qiren Huang chengqing yuan School of Transportation and Logistics Engineering Wuhan University of TechnologyWuhan430063China National Engineering Research Center for Water Transport Safety Reliability Engineering InstituteWuhan430063China

Water-lubricated bearings have great advantages in the application of ship tail bearings due to the characteristics of green,pollution-free,and ***,the poor wettability of water-lubricated materials,as well as the low viscosity and poor load-carrying capacity of water,resulting in poor lubricating film integrity and short material service life under low-speed,heavy-load,start-stop conditions,which limits its *** study the relationship between wettability and lubrication state and improve the lubrication performance of Si_(3)N_(4) under water lubrication conditions,the characteristic parameters that determine the hydrophilicity of Sphagnum were detected and extracted,and the bionic Si_(3)N_(4) model was established using Material ***,the molecular dynamic behavior and tribological properties of different Si_(3)N_(4) models were simulated and *** structure affects the spreading and storage of water on the material surface and changes the wettability of the *** the condition of water lubrication,better wettability and water storage promote the formation of water film,effectively improve the lubrication state of the material,and improve its bearing performance.

关键词： Molecular dynamic Water-lubricated bearing Wettability Friction

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Friction reduction behavior of oil-infused natural wood

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Friction 2022年第11期10卷 1824-1837页

作者： Shutian LIU Conglin DONG chengqing yuan Xiuqin BAI School of Transportation and Logistics Engineering Wuhan University of TechnologyWuhan 430063China Key Laboratory of Marine Power Engineering&Technology(Ministry of Transport) Wuhan University of TechnologyWuhan 430063China Polymer Technology Department of Mechanical EngineeringEindhoven University of TechnologyEindhoven 5600 MBthe Netherlands

Natural materials tend to exhibit excellent performance in the engineering field because of their structure and special functions.A natural red willow,called natural porous wood material(NPWM),was found,and wear tests were conducted to determine its potential as an oil-impregnated material by utilizing its special porous *** treatment was adopted to improve the NPWM properties for absorbing and storing lubricating *** different contributions of soaking and fluorination-soaking treatments on the tribological properties of NPWMs and their respective mechanism of effect were *** results showed that the fluorination-soaking treatment helped absorb and store sufficient lubricating oil in the NPWM porous structure;therefore,more lubricating oil would be squeezed out and function as a tribol-film between contacting surfaces during the friction process,thus ultimately contributing to stable and smooth wear responses even under prolong ***,the formation of an oil-in-water emulsion,caused by the buoyancy effect,destroyed the oil films on the worn NPWM surface in a water environment,resulting in higher coefficients of friction(COFs)under water conditions than under dry friction,even after the fluorination-soaking *** knowledge gained herein could not only verify the potential of NPWM as an excellent oil-impregnated material in the engineering field but also provide a new methodology for the design of artificial porous materials with stable and smooth friction processes.

关键词： natural porous material oil infusion treatment fluorination frictional behaviors

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Application of Bionic Tribology in Water-Lubricated Bearing:A Review

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Journal of Bionic Engineering 2022年第4期19卷 902-934页

作者： Xuefei Li Zhiwei Guo Qiren Huang chengqing yuan School of Transportation and Logistics Engineering Wuhan University of TechnologyWuhan 430063China National Engineering Research Center for Water Transport Safety Reliability Engineering InstituteWuhan 430063China

Water-lubricated bearing has become the development trend in the future because of its economy and environmental *** poor friction performance under low speed and heavy load seriously limits the popularization and application of water-lubricated *** from nature,the phenomenon of low friction and wear in nature has aroused great interest of scientists,and a lot of research has been carried out from mechanism analysis to bionic *** this review,our purpose is to provide guiding methods and analysis basis for the bionic design and theoretical research of anti-friction and anti-wear of water-lubricated *** development of water-lubricated bearing materials are *** typical examples of natural friction reduction and drag reduction are introduced in detail,and several representative preparation methods are ***,the application status of bionic tribology in water-lubricated bearings is summarized,and the future development direction of water-lubricated bearings is prospected.

关键词： Water-lubricated bearing Bionic tribology Bearing material Friction Wear

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Tribological evaluation of thermoplastic polyurethane-based bearing materials under water lubrication:Effect of load,sliding speed,and temperature

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Friction 2024年第8期12卷 1801-1815页

作者： Shaoli JIANG Janet SSWONG Debashis PUHAN Tian yuan Xiuqin BAI chengqing yuan State Key Laboratory of Maritime Technology and Safety Wuhan University of TechnologyWuhan 430063China Department of Mechanical Engineering Imperial College LondonLondon SW72AZUK Yusuf Hamied Department of Chemistry University of CambridgeLensfield RoadCambridge CB21EWUK

Polymers are widely used in bearing *** the case of water-lubricated stern tube bearings,thermoplastic polyurethane(TPU)-based composites are used due to their excellent wear resistance,corrosion resistance,and tunable mechanical *** tribological performance,however,depends on operating *** this work,TPU was blended with carbon fiber,graphene platelet,and ultra-high molecular weight polyethylene(UHMWPE).Friction tests of TPU based-composites against copper countersurface were carried out in water to mimic the actual operating conditions of the *** of the resulting contacts were in the boundary lubrication regime,in which friction was attributed to both contact mechanics of asperities as well as water *** results show that the viscoelasticity of TPU has a considerable impact on its tribological *** lubrication at 50°C promotes the softening of polymer surface material during sliding,resulting in higher fluctuation in the coefficient of friction and wear *** is attributed to the reduced thermomechanical *** addition,Schallamach waviness is observed on worn *** tribological properties of TPU are significantly improved by the inclusion of carbon fiber,graphene platelet,and *** formation of graphene transfer-layers and UHMWPE transfer film reduces friction and wear loss,while the inclusion of carbon fiber enhances wear resistance due to improved mechanical properties and load bearing capacity.

关键词： friction thermoplastic polyurethane(TPU) water-lubricated bearings graphene platelet carbon fibers ultra-high molecular weight polyethylene(UHMWPE)

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Assessment model for tribological property of ceramic/stainless steel rubbing pairs in H_2O_2 solution

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Science China(Technological Sciences) 2013年第12期56卷 3017-3023页

作者： DONG CongLin yuan chengqing LI Jian YAN XinPing School of Energy and Power Engineering Wuhan University of Technology Key Laboratory of Marine Power Engineering & Technology of Ministry of Communications Wuhan University of Technology Wuhan Research Institute of Materials Protection

The tribological properties of ZrO2 ceramic and 1Cr18Ni9Ti stainless steel rubbing pairs were investigated using a special tribo-tester under different concentrations of hydrogen peroxide (H2O2) *** comparison analyses of the friction coefficients,worn volume rates,worn particles and surface roughness were conducted under the tested *** were significant differences of the tribological properties of the rubbing pairs in the different concentrations H2O2 solution because of oxidation and *** research has revealed that the main wear mechanisms between the rubbing pairs are severe adhesive wear,abrasive wear and corrosive wear in the H2O2 solution with different concentrations.A model has been established to assess the most suitable concentration of the H2O2 solution for the tribological properties of the rubbing *** result shows that 50% concentration of the H2O2 solution is the most *** assessment result is consistent with the experimental *** is believed that the knowledge gained in this study is useful for the optimization of the friction pairs in the extreme condition.

关键词： ZrO2 ceramic 1Cr18Ni9Ti stainless steel hydrogen peroxide

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Insight into tribological problems of green ship and corresponding research progresses

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Friction 2018年第4期6卷 472-483页

作者： Yuwei SUN Xinping YAN chengqing yuan Xiuqin BAI School of Energy and Power Engineering Wuhan University of Technology Reliability Engineering Institute National Engineering Research Center for Water Transport Safety(WTS Center) MoSTWuhan University of Technology Key Laboratory of Marine Power Engineering and Technology MoTWuhan University of Technology Reliability Engineering Institute National Engineering Research Center for Water Transport Safety (WTS Center)MoSTWuhan University of Technology

The so-called "green ship" is being regarded as a potential solution to the problems that the shipping industry faces, such as energy conservation and environmental protection. Some new features, such as integrated renewable energy application, biomimetic materials, and antifriction and wear resistant coating have been accepted as the typical characteristics of a green ship, but the tribology problems involved in these domains have not been precisely redefined yet. Further, the related research work is generally focused on the technology or material itself, but not on the integration of the applicable object or green ship, marine environment, and tribological systematical analysis from the viewpoint of the energy efficiency design index(EEDI) and ship energy efficiency management plan(SEEMP) improvements. Aiming at the tribology problems of the green ship, this paper reviews the research status of this issue from three specific domains, which are the tribology problems of the renewable energy system, tribological research for hull resistance reduction, and energy efficiency enhancement. Some typical tribological problems in the sail-auxiliary system are discussed, along with the solar photovoltaic system and hull drag reduction in traditional marine mechanical equipment. Correspondingly, four domains that should be further considered for the future development target of the green ship are prospected.

关键词： green ship tribology renewable energy biomimetic material ship drag reduction

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Designing soft/hard double network hydrogel microsphere/UHMWPE composites to promote water lubrication performance

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Friction 2021年第3期9卷 551-568页

作者： Chaobao WANG Xiuqin BAI Conglin DONG Zhiwei GUO chengqing yuan Anne NEVILLE School of Energy and Power Engineering Wuhan University of TechnologyWuhan 430063China Key Laboratory of Marine Power Engineering&Technology(Ministry of Transport) Wuhan University of TechnologyWuhan 430063China Institute of Functional Surfaces School of Mechanical EngineeringUniversity of LeedsLeeds LS29JTUnited Kingdom

Several soft tissues residing in the living body have excellent hydration lubrication properties and can provide effective protection during relative *** order to apply this advantage of soft matters in practical applications and try to avoid its disadvantage,such as swelling and weakening in water,a design strategy of a soft/hard double network(DN)hydrogel microsphere modified ultrahigh molecular weight polyethylene(UHMWPE)composite is proposed in this study.A series of microspheres of urea-formaldehyde(UF),polyacrylamide(PAAm)hydrogel,UF/PAAm double network,and their composites were *** mechanical properties,swelling,wettability,friction properties,and the lubrication mechanisms of the composites were *** results show that DN microspheres can have an excellent stability and provide hydration *** performance of 75 DN-1 composite was superior to *** finding will provide a novel strategy for the development of water-lubricated materials and have wide application in engineering fields.

关键词： double network microsphere composite friction properties hydration lubrication

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Evalution of Thermal Oxidative Degradation of Trimethylol-propane Trioleate by TG/DTA/DSC

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Journal of Wuhan University of Technology(Materials Science) 2021年第2期36卷 280-288页

作者： ZHAN Wen DUAN Haitao LI Xinxiang LI Jian yuan chengqing Wuhan Research Institute of Materials Protection China Academy of Machinery Science and TechnologyWuhan 430030China School of Energy and Power Engineering Wuhan University of TechnologyWuhan 430063China

In order to evaluate the thermal oxidation degradation behavior of lubricant with different antioxidants,the thermal kinetics equation based on the anlyses of thermogravimetry(TG),differential thermal analysis(DTA),and differential scanning calorimetry(DSC)was established,respectively,to calculate the activation energy of lubricant thermal-oxidative *** thermal analyses of TG and DTA were employed to determine the thermal decomposition properties of ester oils trimethylolpropane trioleate(TMPTO)with butyl-octyl-diphenylamine/octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate/amine-phenol combination *** activation energy of the lubricating oil adding antioxidant is increased relative to the TMPTO base oil,and the order of activation energy are Ec(93.732 kJ·mol^(-1))>Ed(88.71 kJ·mol^(-1))>Eb(58.41 kJ·mol^(-1))>Ea(46.32 kJ·mol^(-1)).The experimental results show that octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate in TMPTO has favorable resistance to thermal oxidation and *** thermal analysis method of DSC accurately reflects the heat exchange of lubricant thermal-oxidative *** order of activation energy is calculated to ED(144.385 kJ·mol^(-1))>EC(110.05 kJ·mol^(-1))>EB(97.187 kJ·mol^(-1))>EA(66.02 kJ·mol^(-1)).It is illustrated that the amine-phenol combination antioxidant has the best thermal oxidation resistance,which is the same as what the oxidation onset temperature effected.

关键词： thermal oxidative degradation thermal kinetics antioxidants trimethylolpropane oleate

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Numerical surface characterization of wear debris from artificial joints using atomic force microscopy

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Chinese Science Bulletin 2009年第24期54卷 4583-4588页

作者： yuan chengqing JIN ZhongMin TIPPER J L YAN XinPing Reliability Engineering Institute Wuhan University of Technology Wuhan 430063 China Institute of Medical and Biological Engineering University of Leeds Leeds LS2 9JT United Kingdom

Study on surface features of wear particles generated in wear process provides an insight into the progress of material failure of artificial joints. It is very important to quantify the surface features of wear particles in three dimensions. In this study, a new approach using atomic force microscopy was proposed to carry out 3D numerical surface characterization of wear debris generated from artificial joints. Atomic force microscopy combined with image processing techniques was used to acquire appropriate 3D images of wear debris. Computerized image analysis techniques were then used to quantify surface texture features of wear debris such as surface roughness parameters and surface texture index. The method developed from the present study was found to be feasible to quantity the surface characterization of nanoand micro-sized wear debris generated from artificial joints.

关键词：原子力显微镜人工关节表面特性数值磨粒表面粗糙度参数磨损颗粒三维图像

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