scholarly journals The Dependence of Aftereffects and Contact of Rough Surfaces Composite – Metal from Orientation Factors of Dispersed Phase of Polymer Matrix

2016 ◽  
Vol 17 (2) ◽  
pp. 294-305
Author(s):  
H.O. Sirenko ◽  
L.M. Soltys
Keyword(s):  
Fiber Orientation ◽  
Friction Surface ◽  
Carbon Materials ◽  
Friction Pair ◽  
Surface Friction ◽  
Sliding Direction ◽  
Orientation Effects ◽  
Carbon Plastics ◽  
Fibrous Carbon ◽  
Surface Changes

Results of researches of influence orientation effects on the friction properties of carbon-plastics and wear mechanism of unidirectional carbon-plastics have been brought in a work. The optimal structure of carbon-plastics and fiber orientation layers in it relative to the surface friction and sliding direction have been provided. The influence of schemes reinforcing by fibrous carbon materials of polymer composites and schemes contacting of samples composites with the surface of metal counterface on the intensity of wear of friction pair and on the changing of microroughness parameters of metal surface have been researched. It has been shown that the topography of metal counterface surface changes in friction carbon plastics with oriented fibers, but the allocation of heights and curvatures of microroughness peaks of friction surface far removed from the Gaussian allocation and close to Rayleigh allocation.

scholarly journals Mechanical and Thermal Behavior of Fibrous Carbon Materials

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1796
Author(s):  
Blagoj Karakashov ◽  
M’Barek Taghite ◽  
Richard Kouitat ◽  
Vanessa Fierro ◽  
Alain Celzard
Keyword(s):  
Thermal Conductivity ◽  
Elastic Modulus ◽  
Fiber Orientation ◽  
Carbon Materials ◽  
Mechanical Test ◽  
Measurement Techniques ◽  
Conductivity Measurement ◽  
High Porosity ◽  
Fibrous Materials ◽  
Fibrous Carbon

The ability of various commercial fibrous carbon materials to withstand stress and conduct heat has been evaluated through experimental and analytical studies. The combined effects of different micro/macro-structural characteristics were discussed and compared. Large differences in mechanical behavior were observed between the different groups or subgroups of fibrous materials, due to the different types of fibers and the mechanical and/or chemical bonds between them. The application of the Mooney–Rivlin model made it possible to determine the elastic modulus of soft felts, with a few exceptions, which were studied in-depth. The possible use of two different mechanical test methods allowed a comparison of the results in terms of elastic modulus obtained under different deformation regimes. The effective thermal conductivity of the same fibrous materials was also studied and found to be much lower than that of a single carbon fiber due to the high porosity, and varied with the bulk density and the fiber organization involving more or less thermal contact resistances. The thermal conductivity of most materials is highly anisotropic, with higher values in the direction of preferential fiber orientation. Finally, the combination of compression and transient thermal conductivity measurement techniques allowed the heat conduction properties of the commercial fibrous carbons to be investigated experimentally when compressed. It was observed that thermal conductivity is strongly affected under compression, especially perpendicular to the main fiber orientation.

Fibrous carbon materials having a protective oxidation resistant coating

1992 ◽  
Vol 23 (3) ◽  
pp. 219-222
Author(s):  
L. M. Mizyaeva ◽  
N. P. Radimov ◽  
T. K. Mikhailova ◽  
P. F. Lyasota
Keyword(s):  
Carbon Materials ◽  
Resistant Coating ◽  
Fibrous Carbon ◽  
Oxidation Resistant

Thermal Correlation Assessment of the Resource of Interfaces with Solid Lubricating Coatings Based On Mos2 Applied by Magnetron and Other Methods, for Vacuum Conditions

2021 ◽  
pp. 72-80
Author(s):  
P.N. Khopin ◽  
V.V. Grib
Keyword(s):  
High Frequency ◽  
Friction Pair ◽  
Surface Friction ◽  
Friction Temperature ◽  
Thermal Correlation

The analysis of tribotechnical parameters of interfaces with solid lubricating coatings based on MoS2, applied by different methods, was carried out according to the results of tests in vacuum. The surface friction temperature is calculated on the basis of the performed assessment of the load-speed characteristics of these interfaces. Based on the results of tribovacuum tests, the thermocorrelation dependence of the resource of a friction pair with solid lubricating coatings MoS2, applied by vacuum (magnetron and high-frequency) and suspension methods, on the surface friction temperature of the interface was determined. On the basis of this dependence, a method for calculating the resource of the studied tribointerfaces is proposed.

EXPERIMENTAL AND NUMERICAL STUDY OF THERMAL ANALYSIS OF HIGH-SPEED FRICTION BRAKING SYSTEM

2011 ◽  
Vol 10 (01) ◽  
pp. 135-142
Author(s):  
CHUNMEI ZHANG ◽  
YONGFENG LI
Keyword(s):  
Thermal Analysis ◽  
Friction Surface ◽  
High Speed ◽  
Material Selection ◽  
Numerical Study ◽  
Friction Pair ◽  
Maximum Temperature ◽  
Dimensionless Time ◽  
Braking System ◽  
Friction Braking System

Thermal analysis can be used as one of the basis for the friction pair material selection in high-speed friction braking system. In this study, the experimental results showed that surface temperature could be reduced by increasing the radius of the friction disk or thermal conductivity coefficient of disk material with stable braking; In the early stage of long braking, the temperature on the friction surface rises rapidly, but further braking does not lead to a significant rise in temperature; In the case of short braking, there is not enough time for the friction surface to reach the critical temperature, and the disk surface reaches the maximum temperature at the end of braking. During long braking, the dimensionless time capacity of the friction surface reaching the highest temperature is F0 ≈ 0.1F0s.

Laboratory and Field Evaluation of Single Layer and Double Layer High Friction Surface Treatments

2019 ◽  
Vol 2673 (2) ◽  
pp. 552-561 ◽  
Author(s):  
Shuo Li ◽  
Peiliang Cong ◽  
Demei Yu ◽  
Rui Xiong ◽  
Yi Jiang
Keyword(s):  
Double Layer ◽  
Friction Surface ◽  
Single Layer ◽  
Aggregate Size ◽  
Surface Friction ◽  
Field Evaluation ◽  
The United States ◽  
Aggregate Gradation ◽  
State Highway ◽  
Friction Performance

High friction surface treatment (HFST) has been proactively used as a solution to extreme friction demands at locations such as horizontal curves, ramps, bridge decks, and intersections. Considerable efforts have been made to evaluate the use of HFST across the United States (U.S.) The American Association of State Highway and Transportation Officials (AASHTO) has issued a provisional specification, i.e., AASHTO PP 79-14, to help state Departments of Transportation (DOTs) to successfully apply HFST. This paper presents a further effort made by the authors to evaluate and compare the friction performance and durability of single and double layer HFTS systems with calcined bauxite aggregate. The laboratory accelerated polishing was conducted to evaluate the effects of aggregate candidate gradations on the friction performance, such as friction coefficient and macrotexture mean profile depth (MPD), and to determine the aggregate gradation for field evaluation. Field evaluation was conducted on both single and double layer HFST systems using test strips under actual traffic polishing over a time period of nine months that covered an entire snow season. It was found that larger aggregate size tends to yield larger MPD, but larger MPD does not necessarily imply larger friction. The double layer HFST did not outperform the single layer HFST with respect to friction and durability. If the properties of calcined bauxite aggregate are precisely defined, either surface friction or MPD can solely be utilized as the frictional metric for quality assurance (QA) of HFST.

scholarly journals Fiber orientation effects in supported adhesives

1984 ◽  
Vol 29 (12) ◽  
pp. 4415-4420
Author(s):  
F. C. Tolan ◽  
S. A. Mestan ◽  
C. E. M. Morris
Keyword(s):  
Fiber Orientation ◽  
Orientation Effects
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