... a maximum relative difference of less than 3.2% to the numerical simulation results, proving its efficacy. This curve is particularly beneficial for multibody-dynamics models, providing a reliable tool for predicting frictional forces in systems where elliptical EHL contacts, operating within the PE regime...

... condition of EHL stage, elevated velocities decrease the coefficient of friction and augment the film thickness. Email: duhengrui@mail.dhu.edu.cn 1 Corresponding author. Emails: jingwang@dhu.edu.cn ; wj20011226@163.com Email: wangxinqing@mail.dhu.edu.cn Contributed by the Tribology...

... austenite shallow dimples smooth grooves saplings abrasion plastic shear plastic deformation adhesion friction wear wear mechanisms Additive manufacturing (AM) is an innovative manufacturing process applied to produce products with complex geometries and various materials like metals...

... compositions. Xanthoceras sorbifolia Bunge oil (XSBO), derived from woody oil plants renowned for their economic and environmental benefits, emerges as a standout candidate following exclusion of previously reported lubricant types. Comparative evaluations via four-ball friction tests and pressurized...

... effectively reduce wear volume (by approximately 26.4%) as compared to fully formulated oil and that the friction coefficient is decreased to ∼0.02. SEM, Raman, FIB-TEM, and TOF-SIMS characterizations and molecular dynamics simulation were used to investigate the tribological mechanism. A tribo-film composed...

... nanomaterial (Ni-doped hBN) in achieving low friction and low wear properties over an extended range of temperatures. The results indicate that the composite having 4 wt% hBN exhibited the lowest wear-rate among all the materials, whereas the composite having 8 wt% hBN displayed the lowest coefficient...

.... In this advanced technology, the structures of SOM and the formation of MoS 2 during friction determine the efficiencies of SOM additives on the tribological properties of oils. Given the fact that SOM additives have been used intensively in both laboratory researches and industrial applications, this review...

...Wei Qi; Lei Chen; Hui-Chuan Liu; Lin-Gao Lv Traditional oil-soluble organic molybdenum (OM) as friction modifiers (FMs) in engine oils contain sulfur and/or phosphorus. Both sulfur and phosphorus are detrimental to the automotive exhaust gas catalysts. Consequently, sulfur and phosphorus...

... values. Amongst the tested samples, the friction coefficient was lower for Ti coating, followed by 60Ti-HAP composite coating. The surface roughness was a prominent factor in reducing the friction coefficient of coating samples. Local detachment and brittle fracture were the dominant wear modes in Ti-HAP...

... when the brittle fracture dominates. The means of material removal changes at a certain cutting depth for a particular material, the so-called transition depth of cut (TDoC). This article aims to predict the TDoC while including the effect of friction between the tool and workpiece. We propose...

... are summarized below: The effect of HFO-1234yf on the performance of ATSP-based coatings is negligible. The ATSP-based coatings perform excellent with low friction and extremely low wear irrespective of the presence of refrigerant. The effect of HFO-1234yf on the wear performance of PEEK-based coatings...

.... In addition, relevant trends and impacts of cage design on bearing lubrication and fluid friction have been explored, along with a discussion of prevailing limitations that can be addressed in future bearing CFD models. Fig. 17 Internal grease flow studied through x-ray computed tomography scans...

...Kaisen Zhang; Kun Liu; Danfeng Sun; Tianyan Gao; Jiaxin Ye This study explores the frictional dynamics in wire-on-V-groove contacts, particularly in slip rings, by examining the effects of contact geometry and loading stiffness. Our experimental setup, using three different custom tribometers...

...Huan Zhao; Wei Wang; Xiaojun Xu; Hua Zhong; Daogao Wei; Xiaojun Liu Armature-rail instantaneous current-carrying friction in electromagnetic launchers refers to a sliding electric-mechanical impact friction and transition-induced arc erosion on a millisecond time scale. To reveal the electric...

...Shizhe Deng; Atsushi Kubo; Yoshikazu Todaka; Yoshinori Shiihara; Masatoshi Mitsuhara; Yoshitaka Umeno A series of coarse-grained molecular dynamics simulations were conducted to investigate the temporal evolution of frictional behaviors of lubricants between sliding nanostructured iron surfaces...

...Junichi Hongu; Shunjiro Hattori; Junya Kato; Takao Koide In our previous study, the Matsumoto equation was modified by introducing the directivity of machining marks on the tooth surfaces (directional parameter), and it was adapted to estimate the gear friction coefficient with various finishing...

... and pressure signals (see Sec. 2.2 ) can be recorded at a sample rate of up to 4 kHz. Furthermore, for operation at constant shaft speed, the frictional torque occurring at the sealing contact can be measured in a special configuration (not shown). Here, an in-line torque sensor (measurement range 0–1 Nm...

...-D), and their tribological properties were evaluated with a four-ball friction and wear tester. DNS-2 with a larger particle size can form a high-strength tribo-film on the rubbed surface through shear sintering, thereby reducing the wear scar diameter of the steel ball. DNS-3, RNS-D, and RNS-E...

.... This sensation arises from the physical stimulation of frictional behavior between the skin and flexible materials. Therefore, this study focuses on human fingers as the research subjects and employs flexible materials with micro-textured surfaces as frictional objects. A friction test setup is designed...

...Kate Tomlinson; Sam Davison; Paul King; Sebastian Howell-Smith; Tom Slatter; Nick Morris In-cylinder internal combustion engine parasitic frictional losses continue to be an area of interest to improve efficiency and reduce emissions. This study investigates the frictional behavior at the oil...