Research on the Influencing Factors of Friction Coefficient between PTFE and Stainless-Steel of Sliding Isolation Bearings

2013 ◽  
Vol 740 ◽  
pp. 624-629
Author(s):  
Cong Zeng ◽  
Zhong Tao ◽  
Jun Feng Bai
Keyword(s):  
Experimental Investigation ◽  
Stainless Steel ◽  
Friction Coefficient ◽  
Air Temperature ◽  
Positive Pressure ◽  
Sliding Velocity ◽  
Estimation Formula ◽  
Sliding Isolation ◽  
Main Factors ◽  
Data Estimation

The main factors that influent the friction coefficient between PTFE and stainless-steel of sliding isolation bearings (SIB) are introduced in this paper. The positive pressure, sliding velocity, air temperature and lubricant all played important roles to the friction coefficient of SIB. By means of experimental investigation, the friction coefficient of SIB is indicated, and according to the test data, estimation formula of friction coefficient is regressed. Furthermore, relationship between friction coefficient, positive pressure and the use of lubricant are preliminarily validated.

Experimental Investigation on Friction Coefficient of Engineering Polymers Sliding against Different Counterface Materials

2014 ◽  
Vol 903 ◽  
pp. 90-95
Author(s):  
Mohammad Lutfar Rahaman ◽  
Mohammad Asaduzzaman Chowdhury ◽  
Dewan Muhammad Nuruzzaman
Keyword(s):  
Experimental Investigation ◽  
Stainless Steel ◽  
Friction Coefficient ◽  
Mild Steel ◽  
Normal Load ◽  
Operating Conditions ◽  
The Other ◽  
Sliding Velocity ◽  
Friction Process ◽  
Engineering Polymers

In this research, friction coefficients of engineering polymers such as nylon and polytetrafluoroethylene (PTFE) are investigated under normal load and sliding velocity. Experiments are conducted when nylon and PTFE slide against different counterface pin materials such as mild steel and stainless steel 202 (SS 202). Experiments are carried out at different normal loads 2, 4 and 6 N, and sliding velocities 0.2, 0.4 and 0.6 m/s. Results show that in general, friction coefficient of nylon decreases with the increase in normal load and sliding velocity. On the other hand, during friction process, PTFE shows different trend i.e. friction coefficient of PTFE increases with the increase in normal load and sliding velocity. Moreover, it is observed that at identical operating conditions, the values of friction coefficient of nylon and PTFE are different depending on normal load, sliding velocity and counterface material.

Friction Coefficient and Wear Rate of Different Materials Sliding Against Stainless Steel

2013 ◽  
Vol 1 (1) ◽  
pp. 33-45 ◽  
Author(s):  
Dewan Muhammad Nuruzzaman ◽  
Mohammad Asaduzzaman Chowdhury
Keyword(s):  
Stainless Steel ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Normal Load ◽  
304 Stainless Steel ◽  
Sliding Velocity ◽  
Stainless Steel 304 ◽  
Different Types ◽  
Pin On Disc ◽  
Ss 304

This paper examines the relation between friction/wear and different types of steel materials under different normal loads and sliding velocities and to explore the possibility of adding controlled normal load and sliding velocity to a mechanical process. In order to do so, a pin on disc apparatus is designed and fabricated. Experiments are carried out when different types of disc materials such as stainless steel 304 (SS 304), stainless steel 316 (SS 316) and mild steel slide against stainless steel 304 (SS 304) pin. Variations of friction coefficient with the duration of rubbing at different normal loads and sliding velocities are investigated. Results show that friction coefficient varies with duration of rubbing, normal load and sliding velocity. In general, friction coefficient increases for a certain duration of rubbing and after that it remains constant for the rest of the experimental time. The obtained results reveal that friction coefficient decreases with the increase in normal load for all the tested materials. It is also found that friction coefficient increases with the increase in sliding velocity for all the materials investigated. Moreover, wear rate increases with the increase in normal load and sliding velocity. At identical operating condition, the magnitudes of friction coefficient and wear rate are different for different materials depending on sliding velocity and normal load.

scholarly journals The kinetic friction of saline ice against itself at low sliding velocities

1991 ◽  
Vol 15 ◽  
pp. 242-246 ◽  
Author(s):  
D. E. Jones ◽  
F. E. Kennedy ◽  
E. M. Schulson
Keyword(s):  
Experimental Investigation ◽  
Friction Coefficient ◽  
Contact Pressure ◽  
Testing System ◽  
Kinetic Friction ◽  
Sliding Velocity ◽  
Sliding Interface ◽  
The Mean ◽  
Peak Value

An experimental investigation was performed on the kinetic friction coefficient of laboratory-grown, columnar saline ice sliding against itself. Tests were performed on a dual-opposing load apparatus specially manufactured for attachment to an MTS testing system. The mean kinetic friction coefficient, μ, was measured for sliding velocities from 10−6 to 5 × 10−2 m s−1 at temperatures from —3° to —40°C under a contact pressure of about 20 kPa. The ice specimens were oriented with grain columns perpendicular to the sliding interface. At -3°C and at —10°C, three distinct regions were observed: from 10−6 to about 10−5ms−1, μwas nearly constant at 0.5; at velocities from 10−5 to 10−3 m s−1, μ began to drop rapidly to about 0.1; and, above 10−3 m s−1, μ began to level off at ~0.05. The velocity at which μ began to decline increased with decreasing temperature. At temperatures below —10°C, μ increased from ~0.5 at v =10−6ms−1 to a peak value of ~0.7 near a velocity of 5 × 10−5ms−1 and then fell rapidly to about 0.1 at 10−2ms−1. In general, μ increased with decreasing temperature and sliding velocity.

Friction Coefficient of Polymer and Composite Materials Sliding against Stainless Steel

2012 ◽  
Vol 576 ◽  
pp. 590-593
Author(s):  
Dewan Muhammad Nuruzzaman ◽  
Mohammad Asaduzzaman Chowdhury
Keyword(s):  
Stainless Steel ◽  
Composite Materials ◽  
Friction Coefficient ◽  
Glass Fiber ◽  
Normal Load ◽  
Operating Conditions ◽  
Polymer Materials ◽  
Sliding Velocity ◽  
Glass Fiber Reinforced Plastic ◽  
Glass Fiber Reinforced

An endeavor has been made to study and compare the friction coefficient of different polymer and composite materials. Experiments were carried out when stainless steel 304 (SS 304) pin slides on different types of composite and polymer materials such as cloth reinforced ebonite (commercially known as gear fiber), glass fiber reinforced plastic (glass fiber), nylon and polytetrafluoroethylene (PTFE). Experiments were conducted at normal load 5, 7.5, 10 N, sliding velocity 0.5, 0.75, 1 m/s and relative humidity 70%. Variations of friction coefficient with the duration of rubbing at different normal loads and sliding velocities were investigated. Results show that friction coefficient varies with duration of rubbing, normal load and sliding velocity. In general, friction coefficient increases with the increase in normal load and sliding velocity for all the tested materials except nylon. At identical operating conditions, the magnitudes of friction coefficient are different for different polymer and composite materials.

scholarly journals Sliding Friction of Steel Combinations

2014 ◽  
Vol 8 (1) ◽  
pp. 364-369 ◽  
Author(s):  
Mohammad A. Chowdhury ◽  
Dewan M. Nuruzzaman ◽  
Md. Arefin Kowser ◽  
Md. MostafizurRahman ◽  
Biplov K. Roy ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Friction Coefficient ◽  
Sliding Friction ◽  
Tribological Characteristics ◽  
Operating Parameters ◽  
Sliding Velocity ◽  
Wear Rates ◽  
Initial Stage ◽  
Steel Disc ◽  
Investigation Period

Tribological characteristics of steel combinations are observed in this study using rotating tribometer. Experiments are done under different roughnesses ofpin slides on stainless steel disc for different operating conditionsCertain trends are obtained between friction and rubbing durations. During experiment, it is foundthat there are significant relationship between friction coefficient and operating parameters. In fact, at initial stage friction coefficients of tested material are increased at a particular level with time and finally the friction becomes steady for remaining investigation period. Studies indicate that lower values of friction are obtained with higher loads for SS 202 slides against different roughnesses ofmild steel counterface. Under similar conditions,higher values of frictions are found with higher values of sliding velocity. In addition to that, wear rates show higher values with higher load and velocity conditions. Tribological characteristics are varied for different roughnesses of pin materials under experimental ranges of two influencing prameters.

scholarly journals The kinetic friction of saline ice against itself at low sliding velocities

1991 ◽  
Vol 15 ◽  
pp. 242-246 ◽  
Author(s):  
D. E. Jones ◽  
F. E. Kennedy ◽  
E. M. Schulson
Keyword(s):  
Experimental Investigation ◽  
Friction Coefficient ◽  
Contact Pressure ◽  
Testing System ◽  
Kinetic Friction ◽  
Sliding Velocity ◽  
Sliding Interface ◽  
The Mean ◽  
Peak Value

An experimental investigation was performed on the kinetic friction coefficient of laboratory-grown, columnar saline ice sliding against itself. Tests were performed on a dual-opposing load apparatus specially manufactured for attachment to an MTS testing system. The mean kinetic friction coefficient, μ, was measured for sliding velocities from 10−6 to 5 × 10−2 m s−1 at temperatures from —3° to —40°C under a contact pressure of about 20 kPa. The ice specimens were oriented with grain columns perpendicular to the sliding interface. At -3°C and at —10°C, three distinct regions were observed: from 10−6 to about 10−5ms−1, μwas nearly constant at 0.5; at velocities from 10−5 to 10−3 m s−1, μ began to drop rapidly to about 0.1; and, above 10−3 m s−1, μ began to level off at ~0.05. The velocity at which μ began to decline increased with decreasing temperature. At temperatures below —10°C, μ increased from ~0.5 at v =10−6ms−1 to a peak value of ~0.7 near a velocity of 5 × 10−5ms−1 and then fell rapidly to about 0.1 at 10−2ms−1. In general, μ increased with decreasing temperature and sliding velocity.

Frictional Characteristics of Steel Materials Sliding against Mild Steel

2014 ◽  
Vol 903 ◽  
pp. 33-38
Author(s):  
Mohammad Asaduzzaman Chowdhury ◽  
Dewan Muhammad Nuruzzaman ◽  
Mohammad Lutfar Rahaman
Keyword(s):  
Stainless Steel ◽  
Friction Coefficient ◽  
Relative Humidity ◽  
Mild Steel ◽  
Normal Load ◽  
Operating Conditions ◽  
Sliding Velocity ◽  
Friction Coefficients ◽  
Friction Process ◽  
Different Types

In this study, friction coefficients of different steel materials are investigated and compared. Experiments are carried out when different types of steel discs such as stainless steel 201 (SS 201), stainless steel 301 (SS 301) and mild steel slide against mild steel pin. Experiments are conducted at normal load 5, 7.5 and 10 N, sliding velocity 0.5, 0.75 and 1 m/s and relative humidity 70%. The effects of duration of rubbing on the friction coefficient of different steel materials are investigated. Results show that during friction process, test disc takes less time to stabilize with the increased normal load or sliding velocity. It is found that friction coefficient decreases with the increase in normal load while it increases with the increase in sliding velocity for all the tested materials. As a comparison, it is found that at identical operating conditions, friction coefficients are different for different steel materials depending on normal load or sliding velocity.

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