The importance of static friction characteristics of brake friction couple, and methods of testing

Tribotest ◽  
1996 ◽  
Vol 3 (2) ◽  
pp. 137-148 ◽  
Author(s):  
S. F. Ścieszka ◽  
A. Jankowski
Keyword(s):  
Static Friction ◽  
Friction Couple ◽  
Friction Characteristics

scholarly journals Development of the high precision measurement device of static friction characteristics between surfaces at the fixed coupling section

2019 ◽  
Vol 85 (878) ◽  
pp. 19-00275-19-00275
Author(s):  
Fumihiko INAGAKI ◽  
Noboru MORITA ◽  
Hirofumi HIDAI ◽  
Souta MATSUSAKA ◽  
Tatsuo OHMORI ◽  
...  
Keyword(s):  
High Precision ◽  
Precision Measurement ◽  
Static Friction ◽  
High Precision Measurement ◽  
Measurement Device ◽  
Friction Characteristics ◽  
Fixed Coupling

scholarly journals Effect of Temperature on Static Friction Characteristics for Silicon Wafer/Silicon Wafer Contact

1994 ◽  
Vol 114 (2) ◽  
pp. 168-172 ◽  
Author(s):  
Shigeru Watanabe ◽  
Masafumi Suzuki ◽  
Noboru Yoshimura ◽  
Hiroyuki Fujita
Keyword(s):  
Silicon Wafer ◽  
Static Friction ◽  
Effect Of Temperature ◽  
Friction Characteristics

The effect of moisture on friction coefficient of fabrics used on taekwondo personal protective equipment

2018 ◽  
Vol 233 (1) ◽  
pp. 87-94
Author(s):  
WL Li ◽  
HY Shen ◽  
JT Hung ◽  
CP Shih
Keyword(s):  
Friction Coefficient ◽  
Personal Protective Equipment ◽  
Static Friction ◽  
Original Position ◽  
Protective Equipment ◽  
Friction Characteristics ◽  
Weft Knitted Fabric ◽  
Forearm Skin ◽  
Dry Conditions ◽  
Selection Of

The purpose of this study was to investigate the friction characteristics of different fabrics used in personal protective equipment worn during competition and matches. During vigorous taekwondo activity, sweat, movement, and body collisions may cause personal protective equipment to slide from its original position and accordingly fail to protect the athletes effectively. Therefore, a thorough study investigating the friction characteristics among different fabrics used in personal protective equipment and its effect on the skin is needed. This study is intended to be helpful for the athletes in the selection of appropriate personal protective equipment fabrics. Universal Nano + Micro + Macro Materials Tester was used in friction tests between six different personal protective equipment fabrics and the dorsum forearm skin to obtain the coefficients of kinetic friction and static friction. The results indicated that PVC faux leather showed better anti-skid performance under dry conditions. Under wet conditions, however, the friction coefficient of PVC faux leather decreased significantly due to lubrication, and thus lowered the anti-skid performance. In addition, the friction coefficient of fabrics with better water absorption or drainage capacity showed greater adhesion with the increasing of skin hydration. In particular, 100% polyester weft-knitted fabric showed better anti-skid performance under wet conditions. The result of this study provides a good reference in the selection and design of Taekwondo personal protective equipment for athletes, coaches, and manufacturers.

Study of the effects of relative humidity and velocity on the friction characteristics of pneumatic cylinders

2020 ◽  
Vol 34 (22n24) ◽  
pp. 2040139
Author(s):  
Thuy-Duong Nguyen ◽  
Van-Hung Pham
Keyword(s):  
Relative Humidity ◽  
Sliding Friction ◽  
Static Friction ◽  
Pneumatic Cylinder ◽  
Dynamic Friction ◽  
Friction Forces ◽  
Measuring Device ◽  
Friction Characteristics ◽  
Rod Seals ◽  
Pneumatic Cylinders

The movement of a piston rod in a pneumatic cylinder is directly affected by the air humidity in the atmosphere, especially in the case of piston rods without any means of protection or grease on their surfaces. In a pneumatic cylinder system, the friction between the piston rod and the rod seal is sliding friction, and it has a significant value that varies with the variation in the moisture on the piston rod’s surface. In this paper, an investigation of the friction characteristics of piston rods and rod seals in a pneumatic cylinder was carried out with different humidity and velocity values to understand the effect of lubricants on the moving parts of pneumatic systems in humid environments, where the friction characteristics of the displacements corresponding to the static and dynamic friction forces were displayed on a measuring device. The research results showed that the static friction forces tended to decrease by [Formula: see text] and that the dynamic friction forces tended to decrease by [Formula: see text] when the relative humidity increased from 51% to 99% at different velocities between 5 and 100 mm/s.

The Influence of Lubricants on Static Friction Characteristics Under Boundary Lubrication

1985 ◽  
Vol 107 (2) ◽  
pp. 188-194 ◽  
Author(s):  
S. Kato ◽  
E. Marui ◽  
A. Kobayashi ◽  
S. Senda
Keyword(s):  
Machine Tool ◽  
Surface Topography ◽  
Contact Pressure ◽  
Boundary Lubrication ◽  
Carrying Capacity ◽  
Static Friction ◽  
Load Carrying Capacity ◽  
Sliding Speed ◽  
Friction Characteristics ◽  
Load Carrying

Based on a new boundary lubrication model, the characteristics of lubricants under boundary lubrication at low sliding speed and low contact pressure such as in machine tool slideways are investigated in relation to surface topography. It is clarified theoretically and ascertained experimentally that the property of lubricants under boundary lubrication can be estimated by the newly defined appraisal coefficient of boundary lubrication property determined by the thickness and load carrying capacity of adsorbed lubricant film and the surface topography.

STATIC FRICTION CHARACTERISTICS OF CLEATED OUTSOLE SAMPLES ON ASTROTURF

1985 ◽  
Vol 17 (2) ◽  
pp. 222-223 ◽  
Author(s):  
G. A. Valiant ◽  
T. McGuirk ◽  
T. A. McMahon ◽  
E. C. Frederick
Keyword(s):  
Static Friction ◽  
Friction Characteristics

Characteristics of Surface Topography and Static Friction on Scraped Surface Slideway—Part 1

1980 ◽  
Vol 102 (2) ◽  
pp. 97-103 ◽  
Author(s):  
S. Kato ◽  
E. Marui ◽  
A. Kobayashi ◽  
T. Matsubayashi
Keyword(s):  
Surface Topography ◽  
Boundary Lubrication ◽  
Complex Surface ◽  
Static Friction ◽  
Friction Characteristics ◽  
Depth Direction ◽  
Ellipsoidal Shape

The complex surface topography of a scraped surface is studied quantitatively. The scraped surfaces are composed of the surface elements which are formed by each scraping operation, distribute in the depth direction, and have many asperities. Based on this model, the microscopic contacting problem between two scraped surfaces and static frictional characteristics are investigated under boundary lubrication. As a result, it is clarified that the ellipsoidal shape of the asperity tip of scraping surface may be regarded as optimal from the point of static friction, and the static friction characteristics are considerably influenced by the scraping directions.

Characteristics of Surface Topography and Static Friction on Scraped Surface Slideway—Part 2

1980 ◽  
Vol 102 (2) ◽  
pp. 104-108
Author(s):  
S. Kato ◽  
E. Marui ◽  
A. Kobayashi ◽  
T. Matsubayashi
Keyword(s):  
Surface Topography ◽  
Boundary Lubrication ◽  
Static Friction ◽  
Topographic Effects ◽  
Friction Characteristics ◽  
Nondimensional Parameter ◽  
Large Coefficient ◽  
Parameter Coefficient

The relation between static friction characteristics and surface topography of contacting scraped surfaces are theoretically examined under boundary lubrication. As a result, it is clarified that the topographic effects on static friction of a scraped surface can be evaluated quantitatively by a nondimensional parameter (coefficient of surface topography). The sliding characteristics of scraped surface slideway can be improved by using surfaces having a large coefficient of surface topography.

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