boundary lubrication
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Author(s):  
Wattanapat Kumwannaboon ◽  
Sathaporn Chuepeng ◽  
Cholada Komintarachat

Friction between rubbing pairs plays a key role in operating machines in an efficient approach. In some intended works or occasional circumstances, slipping friction may occur during dry or boundary lubrication. Lubricating mechanical equipment using proper and efficient lubricant agents is tremendously necessary. This work explores the synthesized triacetin as an additive for lubricant under slipping friction between steel rollers and aluminum, brass, copper, and stainless-steel rods under boundary lubrication. The metal surface morphology under the lubricant with 10% triacetin additive covering roughness periphery is investigated by Field Emission Scanning Electron Microscope imaging. In the dry slipping condition, the friction coefficient is lower for the copper-steel pair compared to the aluminum-steel combination. Compared to the absence of triacetin additive, the steel roller combinations with the rod metal specimens undergoing boundary lubrication with 10% triacetin additive in the lubricant can reduce the slipping friction coefficient by up to 49.2% in the case of steel roller and brass rod pair. The quantitative influences of triacetin additive on metal rubbing pair friction coefficients under boundary lubrication are inversely exponential correlated to triacetin additive, varying in the range of 0 to 10% v/v.


2022 ◽  
Vol 316 ◽  
pp. 125800
Author(s):  
Muhan Wang ◽  
Kaixuan Zhang ◽  
Xiang Ji ◽  
Pan Wang ◽  
Hongyan Ma ◽  
...  

2021 ◽  
Vol 70 (1) ◽  
Author(s):  
Linqing Bai ◽  
Yonggang Meng ◽  
Varian Zhang ◽  
Zulfiqar Ahmad Khan

2021 ◽  
Vol 68 (5) ◽  
pp. 14-23
Author(s):  
Andreas Winkler ◽  
Marcel Bartz ◽  
Sandro Wartzack

This contribution presents an approach for the numerical wear calculation of rolling/sliding-contacts. The finite element method based simulation model of Winkler [1] is extended to include contacts subject to boundary lubrication in addition to contacts subject to mixed lubrication. Using the example of an axial cylindrical roller bearing and two load cases, wear-modeling results of the mixed and boundary lubrication regime are illustrated.


2021 ◽  
Vol 0 (11) ◽  
pp. 21-27
Author(s):  
V. A. Zorin ◽  
◽  
Le Trong Tuan ◽  
M. N. Erofeev ◽  
I. A. Buyanovskii ◽  
...  

The results of laboratory investigation of the tribological characteristics of a new grease based on Solidol, a polyurea thickener providing an increase in the dropping point to 118 °C, and a complex of additives are presented. It has been established that the proposed lubricant is efficient in a wider temperature range, provides higher antiwear properties for tribocoupling parts and considerably reduces friction losses during boundary lubrication in comparison with the original grease Solidol. The developed composition of the lubricant grease is supposed to be used when operating road construction machines in the tropical conditions of Vietnam.


Author(s):  
Lyu Xiuyi ◽  
Bowen Jiao ◽  
Yuechang Wang ◽  
Abdullah Azam ◽  
Xiqun Lu ◽  
...  

The prediction of lubrication performance is required to be the basement of friction optimization for marine engines. This paper simulates the lubrication performance of marine engines based on statistical models which have the advantages of fast, efficient, and macroscopic fault location. Boundary lubrication exists in the piston ring-cylinder liner (PRCL) of two-stroke marine engines because of the harsher load, lower speed, and larger structure. It has been proposed that there would be tribofilm under boundary lubrication which has a significant influence on the contact. To understand the boundary lubrication, it is necessary to study the lubrication regime transition. In this paper, firstly, the coefficient of friction curve combined with the thickness ratio embodies the lubrication regime transition process of two-stroke engines under work conditions. However, the phenomenon that the coefficients under boundary lubrication are smaller than that of other regimes shows the non-objectivity of this curve. Therefore, the Stribeck curve is introduced for objectively evaluating the transition. Then, the calculation of asperities contact pressure under boundary lubrication, which Wen proposed, is introduced into the classic Greenwood-Williamson model, the problem that the original model cannot reflect the boundary lubrication regime in the form of the Stribeck curve is improved. Finally, the results are compared before and after modifying the model to verify this study’s practicability. It provides more precise asperities contact pressure for the tribofilm growth calculation from the perspective of the Stribeck curve under the PRCL statistical model in future work.


Vacuum ◽  
2021 ◽  
pp. 110646
Author(s):  
Xiaojing Fu ◽  
Yang Li ◽  
Huijuan Su ◽  
Lei Cao ◽  
Yong Wan ◽  
...  

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