scholarly journals The coefficient of friction of individual potatoes and various handling materials – Short communication

2012 ◽  
Vol 58 (No. 3) ◽  
pp. 114-117
Author(s):  
C.F.H. Bishop ◽  
A.F.J. Gash ◽  
C. Heslim ◽  
S. Hanney
Keyword(s):  
Mild Steel ◽  
Coefficient Of Friction ◽  
Coefficient Of Variation ◽  
Short Communication ◽  
Dynamic Coefficient ◽  
The Coefficient Of Friction ◽  
Dynamic Coefficient Of Friction

The dynamic coefficient of friction of single potatoes was determined on mild steel, rubber and plastic, for tubers in each of four conditions: dry and dirty, wet and dirty, clean and wet and clean and dry. Steel had the lowest overall mean coefficient of friction. The highest value was recorded for plastic, but this material also had the largest coefficient of variation. Overall, rubber was considered to be the most suitable all-condition material for tubers in a range of conditions.

Design and Fabrication of the First Tribometer in Pakistan

2011 ◽  
Vol 66-68 ◽  
pp. 2198-2201
Author(s):  
Asad Ullah ◽  
Smeer Javed ◽  
M. Tayyab Qamar ◽  
Nadeem Ahmed
Keyword(s):  
Coefficient Of Friction ◽  
Research Work ◽  
Manufacturing Cost ◽  
Dynamic Coefficient ◽  
Test Scenario ◽  
Friction Measurement ◽  
The Coefficient Of Friction ◽  
Wear Friction ◽  
Two Bodies ◽  
Dynamic Coefficient Of Friction

Tribometer is an instrument that offers precise and repeatable wear/friction measurement of a surface. The coefficient of friction is a dimensionless scalar value which describes the ratio of the force of friction between two bodies. It is an empirical measurement; it has to be measured experimentally, and cannot be found through calculations. This tribometer measures coefficient of friction between any two materials in dry test scenario using flat bed approach; moreover it measures both kinetic and dynamic coefficient of friction. As emphasized in the title it is first of its kind being fabricated in Pakistan, which is a huge achievement considering the fact that not much research work is being done in this field in Pakistan. This tribometer is designed to prioritize accuracy and manufacturing cost.

scholarly journals Noise, vibration and harshness during dry clutch engagement oscillations

2020 ◽  
Vol 234 (23) ◽  
pp. 4572-4588
Author(s):  
I Minas ◽  
N Morris ◽  
S Theodossiades ◽  
M O’Mahony
Keyword(s):  
Coefficient Of Friction ◽  
Numerical Models ◽  
Dynamic Coefficient ◽  
Driving Experience ◽  
Clutch Engagement ◽  
Pin On Disc ◽  
Dry Clutch ◽  
Interacting Surfaces ◽  
Noise Vibration ◽  
Dynamic Coefficient Of Friction

Determining the root causes of various noise, vibration and harshness phenomena in modern automotive drivetrains is a critical task for industry, since noise, vibration and harshness issues often result in worsened driving experience. The aim of the current research is to investigate the dynamics during dry clutch engagement and the associated – often problematic – oscillations. This paper reports the development and partial validation of numerical models to study dry clutch behaviour. The models are used to investigate the influence of clutch and throttle actuation on the occurrence of unwanted clutch oscillations. The dynamic coefficient of friction between the clutch interacting surfaces was measured using a pin-on-disc rig under different slip speeds and contact pressure conditions, which are representative of a typical clutch engagement manoeuvre. The paper highlights the occurrence of instability issues in clutch dynamics (disc radial mode) as potential generators of aggressive noise, vibration and harshness, particularly during two different clutch pedal actuations. Such analysis has not hitherto been reported in the open literature.

Ti3SiC2 – A New High Temperature Solid Self-Lubricating Additive Agent

2013 ◽  
Vol 815 ◽  
pp. 626-631
Author(s):  
Li Xin Li ◽  
Xue Quan Liu ◽  
Cun Guang Ding ◽  
Yi Li ◽  
Fa Chang Li ◽  
...  
Keyword(s):  
High Temperature ◽  
Coefficient Of Friction ◽  
Dry Sliding ◽  
Dynamic Coefficient ◽  
Test Results ◽  
Tribological Test ◽  
Solid Additive ◽  
Lubricating Property ◽  
Pin On Disk ◽  
Dynamic Coefficient Of Friction

With the additive agent Ti3SiC2, the dry sliding behavior of Cr3C2-Ni and Cr3C2-Ni-Ti3SiC2 composites against GCr15 was investigated with a pin-on-disk tester at 400 °C in air under the load of 200N. Without Ti3SiC2, the dynamic coefficient of friction (COF) curves was fluctuated severely. After adding Ti3SiC2, the COF was decreased from 0.37 to 0.32, and the initial transition region of dynamic COF curve was shortened. These tribological test results showed that Ti3SiC2 was a new kind of solid additive agent with favorable high temperature self-lubricating property, and two possible mechanisms was proposed for its anti-friction ability.

Paper 21: Variations in Friction and Wear between Unlubricated Steel Surfaces

1966 ◽  
Vol 181 (15) ◽  
pp. 16-24
Author(s):  
S. W. E. Earles ◽  
D. G. Powell
Keyword(s):  
Wear Rate ◽  
Mild Steel ◽  
Oxide Layer ◽  
Coefficient Of Friction ◽  
Surface Film ◽  
Frictional Heating ◽  
Subsequent Increase ◽  
Track Condition ◽  
The Coefficient Of Friction ◽  
Steel Disc

Experiments have been conducted in a normal atmosphere using a 0·25-in diameter mild-steel pin specimen sliding on a 10-in diameter mild-steel disc. The ranges of normal force and speed are 0·5–10·4 lbf and 20–190 ft/s respectively. Initially the coefficient of friction is comparatively large, and the wear is of the severe metallic form. However, frictional heating causes rapid oxidation of the surfaces and, if the sliding distance is sufficient, the eventual retention of an oxide layer causes a rapid decrease in the coefficient of friction and the wear rate decreases by 3–4 orders of magnitude. At speeds above about 75 ft/s and loads below about 5 lbf the formation, after several hours' sliding, of a continuous oxide layer on the track causes a further reduction in the pin wear rate. At higher loads and/or lower speeds this track condition is not attained. At speeds of 75 ft/s and above there exists a critical load (the magnitude of which depends on speed) above which periodic removals of the surface film(s) occur producing metallic wear and high friction. However, the subsequent increase in oxidation allows conditions of mild wear to be re-established generally within a few seconds. The steady-state coefficient of friction has been observed to be a function of load1/2 × speed, and periodic surface breakdowns found to occur when load1/2 × speed exceeds 170 lbf1/2 ft/s, the frequency decreasing with increasing load or speed.

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