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Effect of shot peening on the wear behavior of Ti(C,N) coating on TA15 alloy prepared by double glow plasma carbonitriding Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2021-01-25 Lin Xue; Qiang Miao; Wenping Liang; Hui Zhao; Weiwei Shi; Shiwei Zuo; Hanchun Ma
Purpose The purpose of this paper is to prepare Ti(C,N) coatings on TA15 treated and not treated by shot peening using double glow plasma alloying technique. The effect of shot peening on the wear behavior of Ti(C,N) coatings is discussed. Design/methodology/approach The Ti(C,N) coatings were prepared by double glow plasma alloying technique on two different TA15 substrate; one is shot peened and the
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Experimental study on line-contact elastohydrodynamic grease lubrication properties of surface-textured rollers Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2021-01-25 Fuqin Yang; Dexing Hu; Qianhao Xiao; Shun Zhao
Purpose This paper aims to study line-contact elastohydrodynamic grease lubrication properties of surface-textured rollers as well as the effect of different crown widths (dw) on oil film thickness under textured conditions. Design/methodology/approach The laser processing method was used to make the micro-texture on the surface of GCr15 steel rollers; lithium grease was used as the lubricant, and
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An active control for hydrostatic journal bearing using optimization algorithms Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2021-01-25 Waheed Ur Rehman; Xinhua Wang; Yingchun Chen; Xiaogao Yang; Zia Ullah; Yiqi Cheng; Marya Kanwal
Purpose The purpose of this paper is to improve static/dynamic characteristics of active-controlled hydrostatic journal bearing by using fractional order control techniques and optimizing algorithms. Design/methodology/approach Active lubrication has ability to overcome the unpredictable harsh environmental conditions which often lead to failure of capillary controlled traditional hydrostatic journal
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Structural design of high-speed rolling bearing test rig spindle with cantilever Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-12-04 Hui Li; Hao Li; Rongfeng Zhang; Yi Liu; Shemiao Qi; Heng Liu
Purpose The purpose of this paper is to introduce the structure design process of the cantilever spindle with limited installation space and wishing to increase its critical speed. Design/methodology/approach In this paper, the finite element method was used to analyze the influence of the supporting stiffness and the structure of the spindle on the critical speed, and then the structure of the spindle
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Improvement of thermal EHL by selecting bush-pin geometry based on an investigation for industrial chains Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-12-31 Mingyu Zhang; Jing Wang; Peiran Yang; Yi Liu; Zhaohua Shang; Longjie Dai
Purpose This study aims to investigate the influence of geometry of bush-pin pair from a perspective of optimal lubrication through a thermal elastohydrodynamic lubrication model for finite line contact. Design/methodology/approach A constitutive equation: Ree-Eyring fluid is used in the calculations. The real chain sizes, i.e. equivalent radius of curvature, bush length, length of the rounded corner
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CFD-based calculation method of convective heat transfer coefficient of spiral bevel gear in intermediate gearbox under splash lubrication Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2021-01-19 Fengxia Lu; Meng Wang; Weizhen Liu; Heyun Bao; Rupeng Zhu
Purpose This paper aims to propose a numerical method to calculate the convective heat transfer coefficient of spiral bevel gears under the condition of splash lubrication and to reveal the lubrication and temperature characteristics between the gears and the oil-air two-phase flow. Design/methodology/approach Based on computational fluid dynamics, the multiple reference frames (MRF) method was used
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DLC-coated spur gears – part I: friction reduction Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2021-01-19 Andreas Schwarz; Martin Ebner; Thomas Lohner; Karsten Stahl; Kirsten Bobzin; Tobias Brögelmann; Christian Kalscheuer; Matthias Thiex
Purpose This paper aims to address the influence of diamond-like carbon (DLC) coatings on the frictional power loss of spur gears. It shows potentials for friction and bulk temperature reduction in industrial use. From a scientific point of view, the thermal insulation effect on fluid friction is addressed, which lowers viscosity in the gear contact due to increasing contact temperature. Design/methodology/approach
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An improved degraded adhesion model for wheel–rail under braking conditions Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2021-01-05 Wenliang Zhu; Wenjian Zhu; Shubin Zheng; Na Wu
Purpose The purpose of this paper is to develop an improved adhesion model to better reproduce the low adhesion condition of the anti-skid control for rail vehicles under braking condition. Design/methodology/approach In view of the low adhesion characteristics for rail vehicles under braking conditions, the Polach adhesion model was improved based on the sliding power and sliding energy. The wheel–rail
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Effect of changing geometrical characteristics for different shapes of a single ridge passing through elastohydrodynamic of point contacts Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2021-01-04 Mohamed Abd Alsamieh
Purpose The purpose of this paper is to study the behavior of a single ridge passing through elastohydrodynamic lubrication of point contacts problem for different ridge shapes and sizes, including flat-top, triangular and cosine wave pattern to get an optimal ridge profile. Design/methodology/approach The time-dependent Reynolds’ equation is solved using Newton–Raphson technique. Several shapes of
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Experimental dynamic analysis of rod-fastening rotor bearing system with a transverse crack Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-12-28 Nanshan Wang; Heng Liu; Qidan Wang; Shemiao Qi; Yi Liu
Purpose This study aims to obtain the dynamic behaviours of cracked rod-fastening rotor bearing system (RFBS), and experimental investigation was carried out to examine the dynamic characteristics of this kind of assembled rotor bearing system with a transverse crack passing through the critical speed. Design/methodology/approach An experimental test rig of cracked RFBS was established for examining
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Leakage and rotordynamic characteristics of labyrinth seal and hole-pattern damping seal with special-shaped 3D cavity Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-12-28 Xuan Zhang; Jin-Bo Jiang; Xudong Peng; Jiyun Li
Purpose The purpose of this paper is to enhance sealing and rotordynamic performance of hole-pattern damping seal (HPDS) and labyrinth seal (LS) by structural innovation and geometrical optimization of special-shaped hole or annular-groove cavity. Design/methodology/approach The unsteady flow was transformed into steady one using moving reference frame method. The full period numerical models of LS
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Tribology meets sustainability Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-12-23 Raj Shah; Mathias Woydt; Nabill Huq; Andreas Rosenkranz
Purpose This paper aims to present a comprehensive perspective on how tribology and sustainability are related and intertwined and are linked to CO2 emissions. This paper emphasizes on how tribological aspects affect everybody’s life and how tribological research and progress can improve energy efficiency, sustainability and quality of life. Design/methodology/approach Based upon available data and
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Solid–liquid two-phase flow and erosion calculation of butterfly valves at small opening based on DEM method Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-12-21 Benliang Xu; Zuchao Zhu; Zhe Lin; Dongrui Wang
Purpose The study aims to decrease the effect of solid particles on a butterfly valve, which will cause seal failure and leakage, providing a reference for anti-wear design. Design/methodology/approach In this paper, computational fluid dynamics discrete element method (CFD-DEM) simulation was conducted to study the solid–liquid two-phase flow characteristics and erosion characteristics of a butterfly
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Experimental investigation on wheel–rail adhesion characteristics under water and large sliding conditions Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-12-10 Jiajun Zhou; Mengling Wu; Chun Tian; Zewang Yuan; Chao Chen
Purpose The purpose of this study is to investigate the adhesion characteristics of the wheel–rail under water and large sliding conditions. This is carried out by conducting a series of tests on a full-scale roller rig. The measured data provides an experimental base for conducting further theoretical research. Design/methodology/approach The influence of the slip ratio, rolling speed and the axle
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Load carrying capacity of a novel magnetic-liquid double suspension fixed pad thrust bearing Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-12-10 Shengtong Wang; Ouyang Wu; Zhe Li; Bin Wang
Purpose Proposing a new type of water-lubricated thrust bearing meets the load-bearing requirements of high-power shaft-less rim driven thrusters. Design/methodology/approach The designs were tested by establishing a bearing thermal-fluid-magnetic comprehensive simulation model and developing bearing fluid film force and magnetic simulation. Lubrication performance tests were carried out on the bearing
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Rotor-dynamic performance of porous hydrostatic thrust bearing operating under magnetic field Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-12-10 Vivek Kumar; Vatsalkumar Ashokkumar Shah; Simran Jeet Singh; Kuldeep Narwat; Satish C. Sharma
Purpose The porous bearings are commonly used in slider thrust bearings owing to their self-lubricating properties and cost effectiveness as compared to conventional hydrodynamic bearings. The purpose of this paper is to numerically investigate usefulness of porous layer in hydrostatic thrust bearing operating with magnetic fluid. The effect of magnetic field and permeability has been analysed on steady-state
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Mechanical and tribological properties of waste iron scale reinforced polypropylene composite Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-12-09 Azmi Erdogan; Mustafa Sabri Gök; Bilal Kurşuncu; Tayfun Kiraz; Bilal Demirel
Purpose In this study, waste iron scale, which occurs in high amounts during steel production and contains high amounts of iron element, was used as a reinforcing material in the polypropylene (PP) matrix. Design/methodology/approach In the PP matrix, 33 micron-sized iron scale was added at 5%, 10%, 15% and 20% ratios. The composites were subjected to mechanical and dry sliding wear tests. The wear
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An improved TEHL analysis of textured roller bearings consider various texture parameters and slip Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-12-08 Junning Li; Ka Han; Wuge Chen; Xiaojie Tang; Qian Wang
Purpose The purpose of this study is to reveal the lubrication performance of textured roller bearings under various texture size, texture depth, texture types and slip. Design/methodology/approach In the present study, the improved thermal elastohydrodynamic lubrication method based on the surface texturing of the textured roller bearings is proposed, and then the effect of texture size, texture depth
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Investigating the effect of load on tribological behaviour of Cu composite reinforced with Ti2SnC particles Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-11-02 Fangfang Zhang; Fengyun Yan; Tijun Chen; Xiaohong Li; Zhen Wang
Purpose This paper aims to study the effect of load on the tribological behaviour of Cu-based composites, so as to obtain a suitable applied load on these composites. Design/methodology/approach Cu-based composites were prepared by powder sintering with direct current electric current heating and tested by Universal Mechanical Test-3 with a ball-on-disk at room temperature. Findings The results showed
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Research on optimization of spindle bearing preload based on the efficiency coefficient method Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-11-27 Pingping He; Feng Gao; Yan Li; Wenwu Wu; Dongya Zhang
Purpose The purpose of this paper is to research on optimization of spindle bearing preload based on efficiency coefficient method and provide theoretical guidance for variable preload of intelligent spindle. Design/methodology/approach Based on an established thermo-mechanical coupling model of angular contact ball bearing with fix-position preload, temperature rise and axial stiffness of the bearing
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Influence of contact form on mechanical wear characteristics of single diamond scratching on Ta12W Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-10-12 Haiyong Wu; Hui Huang
Purpose Mechanical wear is the main wear form of abrasive single crystal diamond (SCD) grit. The mechanical wear of SCD grit has a significant influence on the tool life and machining quality. This paper aims to investigate the influence of grit–workpiece contact form on the mechanical wear characteristics of SCD grit. Design/methodology/approach Three different grit–workpiece contact forms, which
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Effect of misalignment and rarefaction effect on the comprehensive characteristic of MEMS gas bearing Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-11-13 Liangliang Li; Yonghui Xie
Purpose Owing to the development of the smaller-sized rotational machinery, the demand for the high-speed and low-resistance gas bearing increases rapidly. The research of micro gas bearing in the condition of rarefied gas state is still not satisfied. Therefore, the purpose of this paper is to present a numerical investigation of the effect of misalignment and rarefaction effect on the comprehensive
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An analytical solution of Reynolds equation for evaluating the characteristics of surface textured bearing Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-09-23 Yazhou Mao; Yang Jianxi; Jinchen Ji; Wenjing Xu; Quanyuan Guo
Purpose Currently, there is a lack of fast and highly accurate on analytical solution of Reynolds equation for evaluating the characteristics of surface textured bearing. This paper aims to develop such an analytical solution of Reynolds equation for an effective analysis of the characteristics of surface textured bearings. Design/methodology/approach By using the separation of variables method and
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Effect of bainitic transformation on the microstructure and wear resistance of pearlitic rail steel Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-10-20 Gustavo Tressia; Luis H.D. Alves; Amilton Sinatora; Helio Goldenstein; Mohammad Masoumi
Purpose The purpose of this study is to develop a lower bainite structure consists of a dispersion of fine carbide inside plates of bainitic ferrite from chemical composition unmodified conventional pearlitic steel under bainitic transformation and to investigate its effect on tensile properties and wear resistance. Design/methodology/approach A commercial hypereutectoid pearlitic rail steel was subjected
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Antiwear and extreme pressure properties of hazelnut oil blended with ZDDP Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-11-06 Wani Khalid Shafi; M.S. Charoo
Purpose The paper aims to investigate the effect of zinc dialkyldithiophosphate (ZDDP) on wear and extreme pressure (EP) capabilities of hazelnut oil. Design/methodology/approach A four-ball tribometer is used to study the effect of ZDDP on the antiwear (AW) and EP performance of hazelnut oil as a lubricant. The AW/EP tests are carried out following ASTM D4172 and ASTM D2783 standards. The wear mechanism
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Multi-metal sulfide pre-blend combination on the tribological performance of the brake friction material Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-11-04 Sathickbasha K.; Selvakumar A.S.; Surya Rajan Balachandran; Hariharasakthisudhan P.
Purpose The purpose of this study is the influence of various combinations of metal sulfides on the tribological performance of brake pads. Design/methodology/approach Three brake pads were prepared using the possible combination of any two of the solid lubricants from Bismuth trisulfide (Bi2S3); Tin disulfide (SnS2) and Antimony trisulfide (Sb2S3) are chosen and blended with molybdenum disulfide and
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Friction characteristics of moving joint surface from the micro and macro scale Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-10-26 Lixin Hai; Feng Gao; Yan Li; Bo Yang; Yanyan Zhu
Purpose The nonlinear friction disturbance of the moving joint surface of the feed system can lead to the residual vibration of the system, prolong the stability time of the system and reduce the motion precision and machining precision of the machine tool. This paper aims to concern the vibration between joint surfaces caused by nonlinear friction. Design/methodology/approach The model is established
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Effect of a transverse crack on the dynamic behaviours of a 3D rod-fastening rotor bearing system Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-10-16 Nanshan Wang; Heng Liu; Yi Liu; Qidan Wang; Shemiao Qi; Zhidong Xu
Purpose This paper aims to examine the dynamic behaviours of a three-dimensional (3D) rod-fastening rotor bearing system (RFBS) with a crack in a fastening rod. Design/methodology/approach Based on the 3D finite element method model and stress analysis of a cracked RFBS, a 3D dynamic model of the RFBS with a crack in a fastening rod is established with considering the initial bending and stress redistribution
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Tribological behaviors of the water-lubricated rubber bearings under different lubricated conditions Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-10-19 Bin Xiao; Xiaolin Zheng; Yi Zhou; Dan Yao; Yang Wan
Purpose This study aims to evaluate the tribological behavior of water-lubricated rubber bearings sliding against stainless steel under different lubricate conditions. Design/methodology/approach The water-lubricated rubber bearings under various normal loads and sliding speeds were carried out on the ring-block friction test, and the wear morphology is test conducted by using scanning electron microscope
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Optimisation of a chuck for cardboard can seaming – part 1: surface engineering and tribological evaluation Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-09-21 Igor Velkavrh; Florian Ausserer; Stefan Klien; Joel Voyer; Georg Vorlaufer; Alexander Abbrederis
Purpose During the production of cardboard food cans, the packaging bottom and the cylindrical wall are joined in the seaming process. In order to achieve a high-quality, crack-free surface of the cardboard seam, low friction between the seaming chuck and the cardboard must be ensured. The goal of this study was to minimise the friction between the seaming chuck and the cardboard can surface. Desi
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Optimisation of a chuck for cardboard can seaming – part 2: numerical modelling and statistical analyses Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-09-21 Igor Velkavrh; Florian Ausserer; Stefan Klien; Joel Voyer; Georg Vorlaufer; Alexander Abbrederis
Purpose In the cardboard package production process, the cardboard roll and the cardboard bottom are joined in the seaming process. During the process, the cardboard is plastically deformed and damage to the cardboard surface can occur. The purpose of this study was to optimise the macro-geometrical parameters of the seaming chuck in order to minimise the cardboard damage during the seaming process
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Damping characteristics of integral squeeze film dampers on vibration of deep groove ball bearing with localized defects Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-10-14 Yifan Hao; Chengdong Zheng; Xiaojing Wang; Chao Chen; Ke Wang; Xin Xiong
Purpose This work aims to demonstrate the vibration suppression of the rotor system with localized defects on bearing using an integral squeeze film damper (ISFD). Design/methodology/approach Experiments were carried out to study the vibration characteristics of the rotor system with ISFD mounted on fault deep groove ball bearings. Three fault bearings including bearing with outer race defect, inner
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Influence of premixed dual metal sulfides on the tribological performance of copper-free brake friction materials Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-10-14 Vijay R.; Manoharan S.; Nagarajan S.; Lenin Singaravelu D.
Purpose The purpose of this study is to deals with the effect of premixed dual metal sulfides (tin disulfide + iron disulfide) as a replacement for antimony trisulfide on the tribological performance of brake friction materials. Design/methodology/approach In this study, brake friction materials were developed by using premixed dual metal sulfides as a replacement for antimony trisulfide in the formulation
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An adjustable oil film thickness test rig for detecting lubrication characteristics of slipper/swash-pair in piston pumps Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-10-12 Haiji Wang; Guanglin Shi
Purpose The purpose of this paper is to propose an adjustable oil film thickness test rig for detecting lubrication characteristics of the slipper. The mathematical analysis of lubrication is introduced. Based on the results from the test rig, the results comparison from test rig and mathematical analysis is carried out. Design/methodology/approach This paper introduces a mechanism which can adjust
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Numerical approach to interpret the attributes of porous journal bearings using couple-stress fluid Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-10-13 Shalini M. Patil; C.V. Vinay; Dinesh P.A.
Purpose The purpose of this paper is to study the amalgamated consequences of nonNewtonian fluid and permeability for nonporous journal spinning with constant tangential velocity inside a rough porous bearing. Design/methodology/approach The flow is assumed to have developed under low Reynolds number, and the flow is governed by reduced Navier–Stokes equations. Based on Stokes theory for couple-stress
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A compounding-model comprising back propagation neural network and genetic algorithm for performance prediction of bio-based lubricant blending with functional additives Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-10-05 Tong Yu; Peng Yin; Wei Zhang; Yanliang Song; Xu Zhang
Purpose The amount, type and addition conditions of additives of lubricants should be continuously adjusted to obtain appealing performance. To obtain the optimal pretreatment parameters and reduce the cost of time-consuming experiments, the purpose of this paper is to establish an optimal back propagation neural network (BPNN) model combined with genetic algorithm (GA) in this work. Design/methodology/approach
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Optimal design of the slip–texture on a journal-bearing surface Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-10-05 Jian Jin; Xiaochao Chen; Yiyang Fu; Yinhui Chang
Purpose This work aims to explore the combined effects of boundary slip and texturing on hydrodynamic journal bearings and identifies optimized slip and texture patterns to improve the performance of journal bearings. Design/methodology/approach The quadratic programming technique is used to study the influence of boundary slip on the lubrication performance of a two-dimensional journal bearing. A
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Discrepancy in oil film distribution observed in ZEV reciprocating motion Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-09-25 Xuyang Jin; Jing Wang; Yiming Han; Nannan Sun; Jianrong Zhu
Purpose This study aims to present the discrepancy in oil film distribution in reciprocating motion experimentally with zero entraining velocity (ZEV) on a conventional ball-disk test rig with oil lubrication. Design/methodology/approach Driven independently by two individual servomotors, a steel ball and a sapphire disc move at equal speed but in opposite directions in a triangle wave. The oil film
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The synergistic effect of carbon materials on properties of copper-based friction materials Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-09-23 Lin Xueyang; Liu Rutie; Wang Lin; Li Zhengzhou; Xiong Xiang; Liao Ning; Chen Jie
Purpose This study aims to investigate the effect of combined use of granular graphite and petroleum coke on the properties of copper-based friction materials and the friction and wear mechanisms. Design/methodology/approach Copper-based friction materials with different proportions of petroleum coke and granular graphite were prepared by using powder metallurgy. The friction surfaces were analyzed
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On the characteristics of gas foil conical bearings considering misalignment Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-09-23 Hongyang Hu; Ming Feng; Tianming Ren
Purpose The purpose of this paper is to study the characteristics of gas foil conical bearings (GFCBs) considering the misalignment, the static and dynamic performances with different misalignment cases were studied. Design/methodology/approach A test rig on the air compressor supported by GFCBs has been developed to measure the practicability. A nonlinear bump stiffness model and one-dimensional beam
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Synergistic effect of Steel Slag-Molybdenum disulfide particles on fade-recovery performances of non-asbestos organic friction material Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-09-23 Sundarrajan D.; Pitchipoo Pandian; Manoharan Sembian
Purpose This paper aims to deal with the synergistic effect of steel slag-molybdenum disulfide particles on fade-recovery performances of non-asbestos organic friction material. Design/methodology/approach The brake friction materials were developed by using steel slag and molybdenum disulfide particles as individual and combination in the formulation. The brake friction materials were developed in
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Research on sealing performance of oil seals with micro-dimple texture on lips Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-09-21 Fuying Zhang; Yuanhao Zhang
Purpose The purpose of this paper is to study the pumping efficiency of oil seals with different surface textures at different speeds, and the influence of the rotation direction of triangular texture on the sealing performance was further analyzed. Design/methodology/approach Based on the theory of elastohydrodynamic lubrication and the pumping mechanism of rotary shaft seals, establishing a numerical
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Thermoelastohydrodynamic characteristics of supercritical CO2 spiral groove face seals Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-09-15 Delei Zhu; Shaoxian Bai
Purpose The purpose of this study is to determine the sealing performance of face seals by numerical analysis of thermoelastohydrodynamic characteristics of supercritical CO2 (S-CO2) spiral groove face seals in the supercritical regime. Design/methodology/approach The spiral groove face seal was used as the research object. The distribution of lubricating film pressure and temperature was analysed
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Theoretical and experimental dynamics analysis of rotor-bearing system supported by elliptical bearings Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-09-11 Zhiming Zhao; Rui Zhang; Feng Ji; Xiaoyang Yuan
Purpose High power and speed are new demands for rotating machinery which needs the journal bearings with high dynamic characteristics. The critical speed of the rotor-bearing system is one of the most significant parameters to evaluate the dynamic characteristics. This paper aims to investigate the theoretical and experimental analysis of a rotor system supported by large diameter elliptical bearings
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Tribological behavior of oils additised with a phosphonium-derived ionic liquid compared to a commercial oil Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-08-28 Marlene Bartolomé Sáez; Antolin E. Hernández Battez; Jorge Espina Casado; José L. Viesca Rodríguez; Alfonso Fernández-González; Rubén González Rodriguez
Purpose The purpose of this paper is to study the antifriction, antiwear and tribolayer formation properties of the trihexyltetradecylphosphonium bis(2,4,4-trimethylpentyl) phosphinate ionic liquid (IL) as additive at 1 wt.% in two base oils and their mixtures, comparing the results with those of a commercial oil. Design/methodology/approach The mixture of the base oils used in the formulation of the
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Influence of micro-scale velocity slip on the dynamic characteristics of aerostatic slider Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-08-26 Dongju Chen; Shuai Kong; Jingfang Liu; Jinwei Fan
Purpose The purpose of this paper is to propose the pressure fluctuation to further evaluate and predict the dynamic and static characteristics of the aerostatic slider and improve the calculation accuracy of the aerostatic slider. Design/methodology/approach First-order velocity slip is introduced into the traditional gas-film fluid equation, and the numerical analysis method is used to solve the
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Experimental analysis and modeling of viscosity and thermal conductivity of GNPs/SAE 5W40 nanolubricant Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-08-05 Valéry Tusambila Wadi; Özkan Özmen; Mehmet Baki Karamış
Purpose The purpose of this study is to investigate thermal conductivity and dynamic viscosity of graphene nanoplatelet-based (GNP) nanolubricant. Design/methodology/approach Nanolubricants in concentrations of 0.025, 0.05, 0.1 and 0.5 Wt% were prepared by means of two-step method. The stability of nanolubricants was monitored by visual inspection and dynamic light scattering tests. Thermal conductivity
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Analysis of turbulence and blocking effects on loading capacity for elementary texture cells of infinite width under water lubrication Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-08-12 Yujun Wang; Qiang Li; Shuo Zhang; Xinhao Tang; Weiwei Xu; Zhenbo Wang
Purpose The loading mechanism of textures considering turbulence has not been fully covered. This paper aims to investigate the effect of turbulence on the textured loading capacity under water lubrication and to analyze the causes of the turbulence effect. Design/methodology/approach Computational fluid dynamic models with different textured shapes are established after validation. The transition
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The effect of cryogenic treatment on dry sliding wear mechanisms in hard coatings Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-08-12 Bilal Kurşuncu
Purpose The effect of cryogenic heat treatment on the mechanical properties of different materials has been frequently investigated by researchers in recent years. The purpose of this paper is to investigate wear behaviour of monolayer, multilayer and nanocomposite coatings after cryogenic heat treatment. It is a first in its field in terms of both the heat treatment used and the coatings examined
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The thermal oxidation mechanism of TMPTO with antioxidants investigated by ReaxFF MD Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-08-10 Wen Zhan; Shengpeng Zhan; HaiTao Duan; Xinxiang Li; Jian Li; Bingxue Cheng; Chengqing Yuan
Purpose This paper aims to study the thermal oxidation performance of antioxidant additives in ester base oils deeply. Design/methodology/approach ReaxFF molecular dynamics was used to simulate the thermal oxidation process of butyl octyl diphenylamine and octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propanoate as two antioxidant additives act on the Trimethylolpropane trioleate (TMPTO) base oil
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Tribological and physical properties of PTFE-NBR self-lubricating composites under water lubrication Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-08-06 Wei Feng; Lei Yin; Yanfeng Han; Jiaxu Wang; Ke Xiao; Junyang Li
Purpose This paper aims to explore the possibility of converting the nitrile butadiene rubber (NBR) water-lubricated bearing material into a self-lubricating bearing material by the action of polytetrafluoroethylene (PTFE) particles and water lubrication. Design/methodology/approach A group of experimental studies was carried out on a ring-on-block friction test. The physical properties, tribological
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Deformation mechanism and tribological behavior of hydrogen-free carburized layer on Ti-6Al-4V alloy Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-07-31 Tian Tian; Ruibo Zhao; Dongbo Wei; Kai Yang; Pingze Zhang
Purpose The purpose of this paper is to expound the relationship among microstructure, mechanical property, tribological behavior and deformation mechanism of carburized layer deposited on Ti-6Al-4V alloy by double-glow plasma hydrogen-free carburizing surface technology. Design/methodology/approach Morphologies and phase compositions of the carburized layer were observed by scanning electron microscope
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The onset of friction for rubber across an ice bead Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-07-27 Zheng Zhang; Yanbao Guo; Wanjun Li; Deguo Wang; Yongjie Zhou
Purpose The exploration of the polar regions is of immeasurable potential. It brings great challenges to tribology in the extreme environment. Moreover, the static friction force is an essential index of the braking performance. The purpose of this paper is the static friction force between the rubber of marine pipe tensioner and the ice bead. Design/methodology/approach The frictional phenomena were
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Fretting wear behavior of WS2/ultra-high molecular weight polyethylene nanocomposites Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-07-29 Xiaocui Xin; Yunxia Wang; Zhaojie Meng; Hao Liu; Yunfeng Yan; Fengyuan Yan
Purpose This paper aims to focus on studying the addition of nano-tungsten disulfide (WS2) on fretting wear performance of ultra-high-molecular-weight-polyethylene (UHMWPE). Design/methodology/approach In this study, the effect of WS2 content on fretting wear performance of UHMWPE was investigated. The fretting wear performance of the UHMWPE and WS2/UHMWPE nanocomposites were evaluated on oscillating
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Surface roughness effects on non-Newtonian MHD non-parallel squeeze film bearing Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-07-29 Mouhcine Mouda; Mohamed Nabhani; Mohamed El Khlifi
Purpose The purpose of this paper is to examine the effect of surface roughness on the magneto-hydrodynamic (MHD) non-parallel squeeze film lubrication using non-Newtonian lubricant. Design/methodology/approach Based on the MHD thin film lubrication theory and the Stokes theory and homogenization method, the homogenized MHD Reynolds equation is derived considering the squeezing effect. Findings It
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Metallurgical and tribological aspects for squat formation in the aluminothermic weld HAZ edges of rails welded using aluminothermy Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-07-27 Luiz Henrique Dias Alves; Tiago Carvalho Tepedino; Mohammad Masoumi; Gustavo Tressia; Helio Goldenstein
Purpose The purpose of this paper is to present the results of a metallurgical, mechanical and tribological characterization of the weld and heat-affected zone (HAZ) of aluminothermic welding of premium rails used in heavy haul, looking into the origins of the squat defects associated with rail wear. Design/methodology/approach A full factorial design of experiment was carried out for 24 welds of premium
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Optimal design of micro-dimples on crankpin bearing surface for improving engine’s lubrication and friction Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-07-24 Renqiang Jiao; Vanliem Nguyen; Vanquynh Le; Vancuong Bui
Purpose The purpose of this paper is to investigate the optimal design of micro-dimples on the bearing surface of the crankpin bearing (CB) to ameliorate the engine’s lubrication and friction (ELF). Design/methodology/approach A hydrodynamic model of the CB considering the influence of the asperity contact is built under the impact of the dynamic loading of the slider-crank-mechanism. The micro-dimples
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An investigation of impact-sliding behavior and fretting wear of tubes against different supports in steam generators Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-07-15 Kai Guo; Zhongli Han; Yipeng Wang; Yang Wang; Wei Tan
Purpose The purpose of this study is to reveal the interaction behavior between tubes and supports in steam generators and study the fretting wear of tubes in different load conditions. Design/methodology/approach The fretting wear tests were conducted to investigate the fretting wear behavior of the tubes against three kinds of supports: the drilled circular holes (DCH), anti-vibration bars (AVBs)
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Numerical model of two-phase mechanical face seal with shallow grooves based on finite volume method Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-07-15 Wenbin Gao; Weifeng Huang; Tao Wang; Ying Liu; Zhihao Wang; Yuming Wang
Purpose By modeling and analyzing the two-phase mechanical seal of the fan-shaped groove end face, which is prone to phase change, an effective method to study the flow field of the mechanical seal when both cavitation and boiling exist simultaneously is found. Design/methodology/approach Based on the finite volume method, a fluid model was developed to investigate a two-phase mechanical seal. The
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Friction coefficient study of nanocomposite Al2O3–NbC obtained by spark plasma sintering-SPS Ind. Lubr. Tribol. (IF 0.798) Pub Date : 2020-07-11 Susan Meireles C. Dantas; Marcio G. Di Vernieri Cuppari; Vania Trombini Hernandes
Purpose This study aims to investigate the friction coefficient of Al2O3–NbC nanocomposite obtained by spark plasma sintering sliding against a steel ball. Design/methodology/approach Tribological tests were carried out using a reciprocating nanotribometer in a ball on flat configuration with normal loads in the range from 10 to 100 mN under dry conditions. Surface changes were analyzed by confocal
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