scholarly journals RHEOLOGICAL PROPERTIES OF LUBRICANT LAYERS AND ENERGOLOADINGS IN THE CONTACT OF FRICTION PAIR AT ALTERNATING CONTACT PRESSURE

2016 ◽  
Vol 0 (4(69)) ◽  
Author(s):  
О. О. МІКОСЯНЧИК ◽  
Р. Г. МНАЦАКАНОВ ◽  
М. С. ХІМКО ◽  
С. В. ШАКУЛІЄВ
Keyword(s):  
Rheological Properties ◽  
Contact Pressure ◽  
Friction Pair

Minimization of contact pressure for hub–shaft friction pair

2015 ◽  
Vol 36 (5) ◽  
pp. 404-408 ◽  
Author(s):  
V. M. Mirsalimov ◽  
P. E. Akhundova
Keyword(s):  
Contact Pressure ◽  
Friction Pair ◽  
Shaft Friction

Investigation of Friction Temperature in Railway Disc Brake

2012 ◽  
Vol 479-481 ◽  
pp. 202-206
Author(s):  
Wan Hua Nong ◽  
Fei Gao ◽  
Rong Fu ◽  
Xiao Ming Han
Keyword(s):  
Finite Element ◽  
Contact Pressure ◽  
Friction Pair ◽  
Brake Disc ◽  
Finite Element Software ◽  
Disc Surface ◽  
Friction Temperature ◽  
Steel Disc ◽  
Braking Force ◽  
Braking Process

The distribution of temperature on the rubbing surface is an important factor influencing the lifetime of a brake disc. With a copper-base sintered brake pad and a forge steel disc, up-to-brake experiments have been conducted on a full-scale test bench at a highest speed of 200 Km/h and a maximum braking force of 22.5 KN. The temperature distributions on brake disc surface have been acquired by an infrared thermal camera, and the contact pressure on the contact surface of the friction pair has been calculated by the finite element software ABAQUS. The results show that the area and thermal gradient of the hot bands increase with the increase of braking speed and braking force. The hot bands occur in priority at the radial location of r=200 mm and r=300 mm, and move radially in the braking process. The finite element modelling calculation indicates that the distribution of the contact pressure on the disc surface in radial direction is in a "U"-shape. The maximum contact pressure occur at the radial locations of r=200 mm and r=300 mm, and the minimum contact pressure occur in the vicinity of the mean radius of the disc. The conformity of contact pressure distributions with the practical temperature evolutions indicates that the non-uniform distribution of the contact pressure is the factor resulting in the appearance of hot bands on the disc surface.

scholarly journals Elastohydrodynamic lubricant flow with nanoparticle tracking

RSC Advances ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 1441-1450 ◽  
Author(s):  
S. Jeffreys ◽  
L. di Mare ◽  
X. Liu ◽  
N. Morgan ◽  
J. S. S. Wong
Keyword(s):  
Rheological Properties ◽  
Contact Pressure ◽  
Lubricant Flow

Lubricants operating in elastohydrodynamic (EHD) contacts exhibit local variations in rheological properties when the contact pressure rises.

Finite Element Thermo Analysis of Friction Material Enhanced by Bamboo Fiber

2011 ◽  
Vol 84-85 ◽  
pp. 562-566
Author(s):  
Jun Jie Sun ◽  
Zhi Qin Wang ◽  
Bao Gang Wang ◽  
Wei Ye ◽  
Yun Hai Ma
Keyword(s):  
Temperature Distribution ◽  
Pressure Distribution ◽  
Contact Pressure ◽  
Coupling Effect ◽  
Friction Pair ◽  
Friction Material ◽  
Bamboo Fiber ◽  
Fiber Reinforced ◽  
Adaptive Meshing ◽  
Contact Pressure Distribution

The manufacturing engineering of bamboo fiber reinforced friction material was introduced in this paper. ANSYS was used to do adaptive meshing and establish the contact, impose constraints load and solve, then the temperature field of bamboo fiber reinforced friction material was obtained. The results showed that under the coupling effect of friction heat and pressure, Brake blocks and brake discs in the contact area showed local changes in temperature and stress characteristics. The thermal stress of coupled parts contact surface showed a inhomogeneous distribution. Contact pressure distribution and temperature distribution interact each other, the contact pressure distribution of the coupled parts affects the temperature distribution, and the local feature of temperature distribution of the coupled parts conversely affects the contact pressure distribution. It will provide an important theoretical basis for devising friction brake and selecting material of the friction pair.

Optimum contact pressure in end seals having a metal-caprolon friction pair

1978 ◽  
Vol 14 (2) ◽  
pp. 165-169
Author(s):  
A. D. Domashnev ◽  
N. M. Ryabchikov ◽  
V. K. Sergienko
Keyword(s):  
Contact Pressure ◽  
Friction Pair

scholarly journals Mathematical model of wedge-shaped plain bearing considering the dependence of viscosity on pressure

2021 ◽  
Vol 2131 (2) ◽  
pp. 022039
Author(s):  
A Mukutadze ◽  
V Prikhodko ◽  
I Dolgiy
Keyword(s):  
Bearing Capacity ◽  
Rheological Properties ◽  
Friction Force ◽  
Friction Pair ◽  
Flow Equation ◽  
Plain Bearing ◽  
New Approach ◽  
Self Similar Solution ◽  
The Given ◽  
Standard Support

Abstract This paper outlines a new approach for finding an asymptotic and exact self-similar solution for the zero and first (without taking into account the melt and considering the melt, respectively) approximation of the wedge-shaped plain bearing with a non-standard support profile of the slide and the low-melting metal coating of the surface. The given approach is based on the flow equation of a ferromagnetic fluid for a «thin layer», the continuity equation, as well as the equation describing the profile of the guide’s molten contour. The proposed method takes into account the dependence of the rheological properties of the lubricant and the melt that have ferromagnetic properties in the laminar flow on pressure. We have succeeded in obtaining accurate analytical dependences for the field of velocities and pressure at zero and first approximations and the ones for the profile of the guide’s molten surface. Besides, we have managed to determine the key performance properties for the slide–guide friction pair, including load-bearing capacity and friction force. Finally, we could assess how the bearing capacity and friction force are influenced by parameters caused by the coating melt adapted to the conditions of the support profile friction and a parameter that characterize the rheological properties of the lubricant.

scholarly journals Research on the Influence of Piston Constraint on the Temperature Field of Multi-disc Clutch

2019 ◽  
Vol 256 ◽  
pp. 02006
Author(s):  
Jie Zhang ◽  
Tieshan Zhang
Keyword(s):  
Temperature Field ◽  
Contact Pressure ◽  
Temperature Difference ◽  
Friction Pair ◽  
Simulation Software ◽  
Bench Test ◽  
Two Dimensional ◽  
Temperature Model ◽  
Concentrated Load ◽  
Radial Temperature

The two-dimensional finite element model of multi-disc clutch friction pair was established by Abaqus simulation software, and the contact pressure of the friction surface under different piston constraints was calculated and analyzed. Considering contact pressure as the main heat-generating factor, the two-dimensional heat conduction process was numerically discretized by the implicit difference method. Then the temperature model of the multi-disc clutch friction pair was programmed in Matlab. The bench test verified the correctness of the temperature model. It is found that the temperature field between components is different and shows uneven distribution under the actual constraint. The local temperature of the component near the concentrated load is the highest, in which the radial temperature difference is the largest. The arrangement in which the piston pressure is concentrated in middle diameter produces the lowest temperature and the smallest radial temperature difference, which can effectively avoid thermal deformation of the component due to uneven temperature distribution.

The Influence of Surface Roughness on Elastohydrodynamic Traction

1987 ◽  
Vol 201 (2) ◽  
pp. 145-150 ◽  
Author(s):  
C R Evans ◽  
K L Johnson
Keyword(s):  
Surface Roughness ◽  
Film Thickness ◽  
Rheological Properties ◽  
Root Mean Square ◽  
Contact Pressure ◽  
Viscosity Index ◽  
Root Mean Square Roughness ◽  
Mean Square ◽  
Sliding Surfaces ◽  
The Mean

If the ratio λ of the nominal elastohydrodynamic film thickness h0 to the root-mean-square roughness is greater than about 5, the traction between two rolling and sliding surfaces is negligibly influenced by surface roughness. The traction is then primarily a function of the parameter α0[Formula: see text], as described in reference (4), where[Formula: see text] is the mean contact pressure and αo is the pressure–viscosity index of the lubricant. When λ lies in the range 0.5–6, it is shown that the effect of asperity interaction is for the traction to still be governed by the bulk rheological properties of the oil, but at a pressure corresponding to the mean contact pressure of the asperities.

scholarly journals Computational model of a micropolar lubricant with a non-standard support profile and a metal coating at incomplete filling of the working gap

2021 ◽  
Vol 2061 (1) ◽  
pp. 012037
Author(s):  
G D Vernigora ◽  
E V Kruchinina ◽  
M A Mukutadze
Keyword(s):  
Bearing Capacity ◽  
Rheological Properties ◽  
Friction Force ◽  
Friction Pair ◽  
Mechanical Energy ◽  
Metal Alloy ◽  
Metal Coating ◽  
Flow Mode ◽  
Operating Characteristics ◽  
Incomplete Filling

Abstract The authors propose an asymptotic and exact self-similar solution for zero (without considering the melt) and the first (considering the melt) approximation of a wedge-shaped sliding support with a profile adapted to friction and a fusible metal coating of the guide surface. The solution is based on the equation of a micropolar liquid flow for a “thin layer”, the continuity equation, as well as the equation describing the profile of the molten contour of a guide coated with a fusible metal alloy. The authors have taken into account the formula of the rate of mechanical energy dissipation as well as rheological properties of the lubricant and the melt, which have micropolar properties in the laminar flow mode at incomplete filling of the working gap. Analytical dependences have been obtained for the profile of the molten surface of the guide coated with a low-melting metal alloy, as well as for the velocity and pressure fields at zero and first approximation. In addition, the main operating characteristics of the friction pair under consideration have been determined: the bearing capacity and the friction force. The article contains estimation of the influence of the parameters conditioned by coating melt and adapted to the friction conditions of the support profile, and the parameter characterizing the rheological properties of the lubricant, as well as the length of the loaded area in terms of bearing capacity and friction force.

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