...Nanrong Hu; Hekun Jia; Bifeng Yin; Zeyuan Zhou; Bo Xu The elastohydrodynamic model of hydrodynamic air foil bearing has been built to study the influence of rotor speed, the friction coefficient between bearing components, load and other parameters on the foil displacement of hydrodynamic air...

... densification and hardening secondary phase. The coefficient of friction increases with laser power for the CW samples but decreases for the PW samples. The samples exhibited low wear rates ranging between 25 and 70 × 10 −5 mm 3 /Nm. Pulse wave samples demonstrated better tribological performance compared...

...Hiromitsu Kakudo; Satoshi Takada; Tomoko Hirayama The friction characteristics of SUS440C-Si 3 N 4 lubricated by polytetrafluoroethylene (PTFE) under cryogenic environment have not been researched well. The lubrication mechanisms in such friction condition need to be clarified to improve...

... intermittent motion should not be ignored, and the pressure, temperature rise distribution, and friction coefficient during the stop and start-up are fluctuated obviously. Under the condition of rough surface contact, the contact area will enter the mixed-EHL state during the stop and start-up. Shortening...

... plastic deformation and rapid surface heating, the surface porosities were effectively healed, thus reducing the surface roughness. Combined with the surface-strengthening effects of LSP, the frictional resistance and transfer layer formation on the CSAM LSP surfaces were reduced. The underlying...

... that the prediction results of the model considering the spin moment are closer to the theoretical values than those of the model ignoring this moment. However, the moment increases the friction at the ball/raceway interface, causing this model to underestimate the extent of bearing sliding. Email: 949595870...

.... The parameters i.e. applied load, sliding velocity, sliding distance, and reinforcement content are treated as inputs, whereas the wear rate and coefficient of friction are considered as output variables for the tribological experimentation. The influence of various input process parameters on the tribological...

... of the samples were gently ground with 2500 grit emery paper, and the mean surface roughness on the surface was measured as 0.65 μ m. The coefficient of friction (COF) values varying with the sliding distance were measured and recorded. After measuring the cross-sectional area of the wear tracks with a surface...

... performed. A maximum hardness of 133.3 HV was obtained at the top layer of the FGM. Pin-on-disc wear apparatus was used to evaluate the wear-rate and the coefficient of friction (COF) of the sintered specimen at varied loads. Specimens exhibited a low wear-rate of 2.36 × 10 −7 g/N m with 0.48 as the COF...

...Wyatt Peterson; Farshid Sadeghi; Andreas Meinel; Hannes Grillenberger A test rig was designed and developed to assess the lubrication and friction of a single cylindrical roller and a conformal cage pocket. The roller was lubricated via oil bath in a sealed housing. Inner and outer bearing raceway...

... . 06 01 2022 05 12 2022 11 12 2022 05 01 2023 journal bearing start-stop process tribological property lubrication regime friction hydrodynamic lubrication journal bearings mixed lubrication surface roughness and asperities National Natural Science Foundation...

... to the adhesion and abrasion mechanism generated between the contact surfaces. In this work, the ball-on-flat experiments were performed on stainless steel-420 versus 100cr6 friction pairs under dry, minimum quantity lubrication (MQL) and pool conditions. Then, the wear studies in terms of volume loss, profile...

...Siyu Wang; Rupeng Zhu The mesh stiffness calculation of the planetary gear system with gear crack is investigated, and gear crack is modeled into end-face and addendum extended crack. Furthermore, the mesh stiffnesses are calculated under the effect of friction force obtained under the mixed...

.... The results show that the thermal effect and tooth friction can intensify the dynamic response of the gear transmission. The variation of rotational velocity and torque has a significant impact on the dynamic behaviors of DIGs, the change of tooth waist order parameters have little effect on its dynamic...

... design faces considerable challenge to reduce friction losses, oil consumption, blow-by, and wear. Surface coatings have received great attention in applications of automotive engine components due to their unique friction properties. In this study, an elastic–plastic contact model of rough surfaces...

... tests were performed at room temperature using a reciprocating tribometer at a sliding speed of 1 m min −1 against a 6-mm diameter ZrO 2 ball. When sliding in air, the friction coefficient of Cu-based BMG decreases with the applied loads (5 N, 10N, and 20 N), and the wear behavior is mainly affected...

...Vesa Saikko; Omar Morad; Raine Viitala The recently introduced four-station friction RandomPOD device was utilized in multidirectional, circular translation pin-on-disk (CTPOD) tests. The effect of sliding velocity on friction with orthopaedic bearing materials was studied. The tests included...

... friction and wear in many tribological applications. In the present paper, the effect of micro-texture on the tribological and lubricating performance of the important cylinder block/valve plate interface is studied experimentally and numerically. The experimental investigation was conducted on a disk...

... , pp. 116 – 118 . [7] Serafinska , A. , Hassoun , N. , and Kaliske , M. , 2016 , “ Numerical Optimization of Wear Performance–Utilizing a Metamodel Based Friction Law ,” Comput. Struct. , 165 ( C ), pp. 10 – 23 . 10.1016/j.compstruc.2015.11.013 [8] Godet , M...

... with the lowest coefficients of friction (0.142 ± 0.05) and wear-rate (0.3 ± 0.02 × 10 −4 mm 3 /Nm). Annealing resulted in alloys with good strength-ductility combinations due to appreciable γ′ precipitation enhancement. The microstructure and mechanical characteristics of Ni-xFe-yCo superalloys have been...