Global Analysis of Polymer Pads in a Bearing Element for a Large-Span Movable Sluice

2013 ◽  
Vol 834-836 ◽  
pp. 772-775
Author(s):  
Pin Gou ◽  
Xu Peng ◽  
Lin Ren
Keyword(s):  
Friction Coefficient ◽  
Contact Stress ◽  
Load Transfer ◽  
Global Analysis ◽  
Dry Sliding ◽  
Low Friction ◽  
Reinforced Polymer ◽  
Contact Surfaces ◽  
Polymer Bearing ◽  
Lubrication Conditions

The contact surface of a hinge suffers huge pressure in particularly bad lubrication conditions. Reinforced polymer bearing pads offers low friction under dry sliding conditions. Load transfer between contact surfaces was studied, showing that the pressure and positions are related to the power output of the loco. The friction coefficient of concave bearings with polymer pads was low, and would not totally failed in a high contact stress. Performances of polymer pads on loads were simulated, and provided a global analysis for the design of the pads.

scholarly journals NUMERICAL MODEL OF A LOCAL CONTACT OF A POLYMER NANOCOMPOSITE AND ITS EXPERIMENTAL VALIDATION

2021 ◽  
Vol 19 (1) ◽  
pp. 079
Author(s):  
Andrey I. Dmitriev
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Friction Coefficient ◽  
Experimental Validation ◽  
Polymer Nanocomposite ◽  
Characteristic Size ◽  
Dry Sliding ◽  
Sliding Velocity ◽  
Low Friction ◽  
Local Contact

In the paper a model of a local contact of a polymer-based nanocomposite was developed within the method of a movable cellular automaton. The features of mechanical behavior of nanocomposite at the mesoscale level under dry sliding were studied with explicit account for the microprofile of the counterbody surface and the characteristic sizes of nanofiller. Factors that contribute to the conditions for the formation of a stable tribofilm of silica nanoparticles are analyzed. Two other parameters like sample geometry and the value of relative sliding velocity are also examined. It is shown that the thickness of tribofilm depends on stress conditions at the contact, and the friction coefficient decreases with increasing sliding velocity similar to one observed experimentally. To ensure the low friction properties of polymer nanocomposite, particles whose sizes are comparable with the characteristic size of the substrate microprofile are preferred. Results of numerical simulation are in good correlation with available experimental data.

Improving the tribological and mechanical properties of polyimide composites by incorporating functionalized graphene

2019 ◽  
Vol 32 (1) ◽  
pp. 21-29
Author(s):  
Yuqi Li ◽  
Qiu Zhang ◽  
Hong Ruan ◽  
Fengan Li ◽  
Xu Xu ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Tribological Properties ◽  
Weight Ratio ◽  
Tensile Modulus ◽  
Deionized Water ◽  
Water Lubrication ◽  
Dry Sliding ◽  
Blending Method ◽  
Lubrication Conditions

To explore the effect of added graphene sheets (GNs) and added perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) on the tribological and mechanical performances of polyimide (PI) matrix, GNs and PTCDA reinforced PI-based composites were synthesized via the blending method. The tribological properties of GNs/PTCDA/PI (GAPI) composites with different weight ratios of GNs and PTCDA under dry sliding, deionized water lubrication, and kerosene lubrication were comparatively investigated. A synergism was found between GNs and PTCDA; this synergism endowed filled PI composites with a lower friction coefficient and showed an improved wear rate under different lubrication conditions, especially when the weight ratio of GNs and PTCDA was 1:1 (GAPI-1). Under dry sliding, deionized water lubrication, and kerosene lubrication, the friction coefficient of GAPI-1 composites decreased by 41.1%, 70%, and 35.7%, respectively, while the wear rate decreased by 39%, 50%, and 25.1%, respectively. Meanwhile, the tensile strength, tensile modulus, and the elongation at break of GAPI-1 films increased by 40.8%, 51.3%, and 49.2%, respectively, relative to those of pure PI. We anticipate that this work can be used to exploit a simple and effective method for preparing materials for bearings and transmission parts that possess good tribological properties under harsh lubrication conditions.

scholarly journals Influence of Tread Width of the Brake Pedal Pads on the Friction Coefficient Generated by Bare Foot and Footwear Soles

2012 ◽  
Vol 23 (1) ◽  
pp. 227-245
Author(s):  
Al-Osaimy A. S. Al-Osaimy A. S.
Keyword(s):  
Friction Coefficient ◽  
Dry Sliding ◽  
Contaminated Water ◽  
Brake Pedal ◽  
Sliding Direction ◽  
Consistent Trend ◽  
Coefficient Measurement ◽  
Contact Surfaces ◽  
Sand Particles ◽  
Dry Sand

The present work discusses the effect of the treads width of the rubber brake pedal pads on the friction coefficient. Measurement of friction coefficient generated by bare foot and rubber footwear soles sliding against the brake pedal pads of different treads width in dry, sand contaminated, water and oil lubricated conditions is discussed. Experiments of the sliding of bare foot against the rubber pedal pad showed that friction coefficient of dry sliding significantly decreased with increasing tread width. The sliding direction has no effect on the friction coefficient for the tested pads. In the presence of sand particles separating the two contact surfaces, load had no influence on friction coefficient. Friction coefficient slightly decreased with increasing tread width. For water wetted pedal pad, friction coefficient displayed higher values than that observed for the condition of presence of sand particles. Friction values showed consistent trend with increasing the tread width. Friction displayed by oil lubricated pedal pads was the lowest and the sliding condition could be considered as unsafe.

scholarly journals Effect of Different Lubricating Environment on the Tribological Performance of CNT Filled Glass Reinforced Polymer Composite

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2965
Author(s):  
Sandeep Agrawal ◽  
Nishant K. Singh ◽  
Rajeev Kumar Upadhyay ◽  
Gurminder Singh ◽  
Yashvir Singh ◽  
...  
Keyword(s):  
Tribological Performance ◽  
Hardened Steel ◽  
Dry Sliding ◽  
Gfrp Composites ◽  
Tribological Behaviour ◽  
Reinforced Polymer ◽  
Steel Surfaces ◽  
Lubrication Properties ◽  
Scanning Electron

In recent years, the engineering implications of carbon nanotubes (CNTs) have progressed enormously due to their versatile characteristics. In particular, the role of CNTs in improving the tribological performances of various engineering materials is well documented in the literature. In this work, an investigation has been conducted to study the tribological behaviour of CNTs filled with glass-reinforced polymer (GFRP) composites in dry sliding, oil-lubricated, and gaseous (argon) environments in comparison to unfilled GFRP composites. The tribological study has been conducted on hardened steel surfaces at different loading conditions. Further, the worn surfaces have been examined for a particular rate of wear. Field-emission scanning electron (FESEM) microscopy was used to observe wear behaviours. The results of this study explicitly demonstrate that adding CNTs to GFRP composites increases wear resistance while lowering friction coefficient in all sliding environments. This has also been due to the beneficial strengthening and self-lubrication properties caused by CNTs on GFRP composites, according to FESEM research.

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