...Xianguang Sun; Weichao Chi Purpose This paper aims to develop a thermal contact conductance ( TCC ) model for helical gears that considers the effects of lateral contact between rough surfaces and the friction coefficient, thereby providing insights into the contact performance of helical gears...

... to the target locomotive operating environment. Composite materials Coefficient of friction Microscopic interface morphology Wear Railway tracks Friction coefficient Foundation of China Academy of Railway Sciences Corporation Limited J2024X003&2023TH01 China Railway Beijing Group...

...Ze Zheng; Cuixian Wang; Xiaoming Yuan; Haimin Chen; Weiwei Wang; Yongqi Li Purpose The friction coefficient in mixed lubrication depends on the real contact and lubrication state, which limits the accuracy of sealing performance prediction. This study aims to propose a lubrication-state-based...

.... Findings Results show that texture width and depth increase with higher laser power, decrease with faster scanning, and increase with more scans. The friction coefficient first rises and then falls with increasing power, gradually increases with speed and decreases before rising with additional scans...

...-wear effect. As the vibration frequency was increased, the friction coefficient and the wear amount of the lower specimen initially decreased and then increased. In contrast, with increasing amplitude, both parameters demonstrated a continuous downward trend. Compared with the no-vibration condition...

... the transfer film formation mechanism and the lubricating roles of various fillers in the PEEK composites during the film-forming process. Design/methodology/approach The friction coefficients of three PEEK composite discs sliding against Si₃N₄ balls under dry friction at various...

..., Raman spectroscopy and energy dispersive spectroscopy (EDS). Findings The best concentration of MG is 1.5 Wt.%, at which the copper wire drawing oil exhibits a friction coefficient and wear rate of 0.085 and 2.11 × 10⁻⁶ mm³/Nm, respectively, representing decreases of 22.7...

... with the pitcher plant–like structure, the friction coefficient remains lower than that of the nontextured surface, and it exhibits a decreasing trend with the increasing of the texture width and spacing distance; the lowest friction coefficient (0.04) is achieved with B = 0.3 mm, L = 1.0 mm...

...Zhenshun Li; Jiaqi Li; Ben An; Rui Li Purpose This paper aims to find the best method to predict the friction coefficient of textured 45# steel by comparing different machine learning algorithms and analytical calculations. Design/methodology/approach Five machine learning algorithms...

...Sangryul Go Purpose The purpose of this study is to investigate the accumulation process of transfer film formation and dissipation and its effect on friction coefficients in non asbestos organic friction materials with various lubricant FeS₂ contents. Design/methodology/approach...

.... Findings Introducing V into the MoS₂ coatings results in a more compact microstructure. The hardness of the coatings increases with the doping of V. The MoS₂-V coating deposited at a current of 0.2 A obtains the lowest friction coefficient (0.043) under vacuum. As the amount of V...

...Shanglong Fang; Wei Xiao; Kewen Chen; Xuding Song Purpose Resin-based friction materials are the most widely used key materials in industry for braking and transmission. However, the friction coefficient of resin-based friction materials significantly decreases at temperatures above 300°C, which...

...Hongxiao Li; Li Li Purpose The purpose of this study is to match appropriate friction coefficients for subway operational vehicles, considering the dynamic variations of wheel profile wear. Design/methodology/approach This study combines experimental testing and numerical simulation...

...Xianguang Sun; Xicheng Xin Purpose The purpose of this study is to establish a fractal model of thermal contact conductance (TCC) of micro-segment gear considering friction coefficient. Design/methodology/approach The influences of friction coefficient, fractal dimension, fractal roughness...

.... Findings The computed results indicate that the impact of waviness on the bearing surface enhances the load capacity, reduces friction coefficient, and is more effective in the circumferential direction than in the axial direction or in both directions. The addition of CuO and CeO₂...

... alkanolamine borate, naphthenic base oil, fatty alcohol polyoxyethylene ether and palm oil. The tribological performance of CU-KL and commercial copper wire drawing oils (CU-DRB and CU-8010) was investigated Findings Under applied loads of 5 N-15 N, the average friction coefficient of CU-KL was 29.4%, 5.4...

... were studied by using an MM200 wear test machine. Findings The results show that the friction coefficients and wear rates of copper-embedded self-lubricating bearing materials are lower than those of the ordinary copper-based bearing materials. The wear performance of the tin bronze inlaid self...

... The results indicate that laser-textured micro-dimples are significantly conducive to inhibit stick-slip phenomenon, thus providing smoother movement for the guideway and eventually increasing precision of the machine. Lubrication regime Aser texturing Friction coefficient Stick-slip phenomenon Laser...

...Xianguang Sun; Chunxiao Meng; Tiantang Duan Purpose The purpose of this study is to propose a fractal model of thermal contact conductance (TCC) of two spherical joint surfaces, considering friction coefficient based on the three-dimensional fractal theory. Design/methodology/approach...

...Sıtkı Akincioğlu; Şenol Şirin Purpose The purpose of this study is to investigate the effect of new green hexagonal boron nitride (hBN) nanofluid on AISI 316L stainless friction coefficient, wear resistance and wear using a ball on disc tester. Design/methodology/approach Nanofluids were...