Vermiculite-based organosilicate antifriction composites as coatings on friction surfaces of steel articles

High Friction Surfaces (HFS) are applied to increase friction capacity on critical roadway sections, such as horizontal curves. HFS friction deterioration on these sections is a safety concern. This study deals with characterization of the aggregate loss, one of the main failure mechanisms of HFS, using texture parameters to study its relationship with friction. Tests are conducted on selected HFS spots with different aggregate loss severity levels at the National Center for Asphalt Technology (NCAT) Test Track. Friction tests are performed using a Dynamic Friction Tester (DFT). The surface texture is measured by means of a high-resolution 3D pavement scanning system (0.025 mm vertical resolution). Texture data are processed and analyzed by means of the MountainsMap software. The correlations between the DFT friction coefficient and the texture parameters confirm the impact of change in aggregates’ characteristics (including height, shape, and material volume) on friction. A novel approach to detect the HFS friction coefficient transition based on aggregate loss, inspired by previous works on the tribology of coatings, is proposed. Using the proposed approach, preliminary outcomes show it is possible to observe the rapid friction coefficient transition, similar to observations at NCAT. Perspectives for future research are presented and discussed.

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Low friction surfaces for plastic injection moulding dies—an experimental case study

Wear ◽

10.1016/s0043-1648(98)00417-7 ◽

1999 ◽

Vol 225-229 ◽

pp. 1109-1113 ◽

Cited By ~ 28

Author(s):

P.A. Dearnley

Keyword(s):

Injection Moulding ◽

Low Friction ◽

Plastic Injection Moulding ◽

Friction Surfaces ◽

Plastic Injection

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Express Estimation of the Poisson Ratio of Friction Surfaces

Journal of Friction and Wear ◽

10.3103/s1068366621030119 ◽

2021 ◽

Vol 42 (3) ◽

pp. 185-187

Author(s):

M. M. Matlin ◽

V. A. Kazankin ◽

E. N. Kazankina

Keyword(s):

Poisson Ratio ◽

Friction Surfaces

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Technological improvement of durability of friction surfaces of machine parts on the basis of energy approach

2015 International Conference on Mechanical Engineering, Automation and Control Systems (MEACS) ◽

10.1109/meacs.2015.7414980 ◽

2015 ◽

Author(s):

A.G. Suslov ◽

D.M. Medvedev

Keyword(s):

Energy Approach ◽

Technological Improvement ◽

Machine Parts ◽

Friction Surfaces

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Modeling and synthesis of tactile texture with spatial spectrograms for display on variable friction surfaces

2015 IEEE World Haptics Conference (WHC) ◽

10.1109/whc.2015.7177702 ◽

2015 ◽

Cited By ~ 13

Author(s):

David J. Meyer ◽

Michael A. Peshkin ◽

J. Edward Colgate

Keyword(s):

Variable Friction ◽

Friction Surfaces

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ESTIMATION OF THE EFFICIENCY OF THE LUBRICATION OF THE WORKING SURFACES OF THE SADDLE-COUPLING DEVICE OF THE FOREST TRUCK

10.34220/mmeitsic2021_119-123 ◽

2021 ◽

Author(s):

Valeriy Posmetev ◽

Vadim Nikonov ◽

Viktor Posmetev

Keyword(s):

Computer Experiments ◽

Base Plate ◽

Optimal Number ◽

Actual Problem ◽

Premature Failure ◽

Coupling Device ◽

Excessive Consumption ◽

Operational Factors ◽

Friction Surfaces ◽

The Cost

The importance of the need for further constructive improvement of fifth-wheel couplings of timber tractors with semi-trailers has been substantiated. The main operational factors arising during the movement of a timber tractor with a semitrailer in the process of hauling timber and affecting the premature failure of the main parts of the fifth wheel coupling are considered. The influence on the resource of the fifth wheel coupling device of strict fulfillment of the mandatory operations of periodic lubrication of the saddle and the base plate of the semitrailer in the process of connecting and disconnecting it with a timber tractor is given. Described is the actual problem associated with excessive consumption of lubricant in the process of applying it to the friction surfaces of the saddle and the base plate of the semitrailer by the traditional method of extrusion. A possible method of dosed supply of the required volume of lubricant through the optimal number of lubrication holes to the friction surfaces is considered, which makes it possible to significantly reduce the cost of maintaining the operable state of the fifth wheel coupling. In order to preliminary evaluate the application of this lubrication method, which ensures the effective functioning of the fifth wheel coupling of a timber tractor with a semitrailer, several series of computer experiments were performed to determine the optimal number of lubrication holes in the saddle that evenly and dosed distribute the lubricant between the saddle and the base plate of the semitrailer.

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Application of Multidimensional Statistical Analysis in Tribotechnical Diagnostics of Hydraulic Fluids in Woodworking Equipment

Materials ◽

10.3390/ma14164628 ◽

2021 ◽

Vol 14 (16) ◽

pp. 4628

Author(s):

Michaela Hnilicová ◽

Ján Turis ◽

Richard Hnilica

Keyword(s):

Data Matrix ◽

Multivariate Statistical Methods ◽

Multivariate Statistical ◽

Machine Maintenance ◽

Hydraulic Fluids ◽

Quantitative Characteristics ◽

Friction Surfaces ◽

Qualitative And Quantitative Characteristics

The article dealt with the assessment of the quality of hydraulic oil and determination of the mode of wear of the friction surfaces of Baljer & Zembrod manipulating lines through the information traces in the oils by applying tribotechnical diagnostics. We presented the assessment of the level of degradation of the oils. In addition, we presented the mode of wear of the friction surfaces washed in oil through evaluation of the qualitative and quantitative characteristics of the particles found in the oil. In detail, we focused on the application of suitable multivariate statistical methods on the data matrix. The article also presents predictive models that can sort oils into groups based on the assessment of quality of the oil and the state of the friction couples. The models can be used in research and in solving practical tasks in tribotechnical diagnostics of hydraulic fluids in woodworking equipment. Our results showed that the manipulation lines were greatly thermically stressed due to inadequate oil and machine maintenance. By correlative integration of all methods used, we could determine the real mode of the wear of the tribologic nodes of the machine. The experiment enabled the early detection of an undesirable process in the tribological node and implementation of corrective measures before the machine would break down.

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Assessment of vehicle brake control functional stability

Journal of Mechanical Engineering and Transport ◽

10.31649/2413-4503-2020-12-2-33-44 ◽

2021 ◽

Vol 12 (2) ◽

pp. 33-44

Author(s):

Volodymyr Volkov ◽

◽

Igor Gritsuk ◽

Tetiana Volkova ◽

Volodymyr Kuzhel ◽

...

Keyword(s):

Energy Consumption ◽

Control Method ◽

Operating Conditions ◽

National Standards ◽

Passenger Vehicles ◽

The Difference ◽

Braking Control ◽

The Stability ◽

Friction Surfaces

The article is devoted to the study of the influence of the brake control elements of passenger vehicles on the stability of their braking properties. The analysis of the influence of uneven braking forces on the wheels of one axle of vehicles on the deviation of the distribution of braking forces between the axles from its calculated value is carried out. When assessing the error in regulating the distribution of braking forces between the axles of vehicles, three components were taken into account: the theoretical error due to the imperfection of the selected control method (the difference between the actual calculated control characteristic from the ideal), the error created due to the instability of the ratio of the braking forces on the front and rear wheels, an additional error caused by the unevenness of the braking forces on the wheels of individual axles, since the fulfillment of the most stringent requirements of international and national standards for the efficiency of braking of vehicles and is inextricably linked with the need to increase the energy consumption of brake mechanisms. The energy consumption of braking mechanisms is understood as the ability of the latter to dissipate the greatest amount of energy of the braking machine without reducing the braking efficiency indicators to the minimum permissible level. Excessive heating of the braking mechanisms leads to a decrease in the friction coefficient μ of the friction surfaces and increased wear of the friction linings, and the brakes are the most unstable element of the braking control, which ensures the absorption and dissipation of the vehicle's energy during braking. The instability of the braking torques on the front and rear wheels, caused by a change in the coefficients of friction of friction pairs, leads not only to a change in the distribution of braking forces between the axles and individual wheels, but also to a decrease in the braking efficiency of vehicles under operating conditions. A method is proposed that makes it possible to assess the quality of regulation of the distribution of braking forces between the axles of a car, taking into account the instability of the braking forces on the wheels.

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