# Questions tagged [tribology]

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### Terminology for engine life reduction due to late oil changes

This is a question for engineers working in diesel engine design or tribology. I am doing up an analytics dashboard for my father who analyses oil samples of heavy mining equipment. The diesel fitters ...
41 views

### Entrainment Speed in Ball Bearing

Assuming no slip between the inner race and the outer race of a ball bearing, what is the entrainment speed between the balls and the inner race? The inner race is rotating at $\omega_i$ and the outer ...
10 views

### Positive and negative voltage readings across a rig simulating bearing contact, supplied with a DC source

I recently ran a few experiments to simulate the effects of shaft voltages on motor bearings through using a simplified experimental rig. The rig simulates bearing contact. I applied a DC source ...
1 vote
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### equivalent Hertzian contact pair for arbitrarily shaped bodies in 2D [closed]

I am a bit new to this field here. I am trying to determine the contact stress between two arbitrarily shaped bodies that are indenting into each other (see attached image). I would like to solve ...
• 11
1 vote
268 views

### Does the the field of tribology include the study of adhesives?

Does the field of Tribology include the study of adhesives in addition to the study of lubricants?
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### Approach to solve a frictional problem?

I am having a bar and surface (made of aluminum). I need to attach some material to the end of the bar so that, if I apply any force (25 N-sideways) to bar it has to stick with the surface. Force ...
• 111
34 views

### Power needed to accelerate metal powder through two spinning wheels

I have a wheel which has a radius of 0.1m that needs to spin at 10000RPM. The outer surface of this wheel is pressed up against another free spinning wheel like a football or tennis ball launcher. I ...
• 275
1 vote
3k views

### Significance of the Sommerfeld number

The Sommerfeld number can be written as $$S = \frac{6 \ \mu \ U \ b}{p \ c^2}$$ where U: Velocity b: Width p: Pressure c: Minimal Clearing $\mu$: Absolute Viscosity As far as I'm aware, it may ...
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491 views

### What makes crosshead bearings hard to lubricate?

Regarding crosshead bearing failure, I have read that at slow speed it is difficult to establish a lubricating film because there is an imbalance between forces due to combustion and forces due to ...
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### What's the name of the white lubricant that children's toys often use?

When I was little I would often take apart my toys and found that if they contained any gears or motors they'd always be coated in a white lubricant. What is this substance?
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1 vote
1k views

### Applications with combination of high friction and low wear?

What would be some common applications involving high friction and low wear rates? for example, gear-driven mechanisms which require high friction between the gear teeth but ideally low wear between ...
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3k views

### Is there any material that has a higher kinetic friction than static friction?

Is there a material that has higher kinetic friction than static friction? You can assume it's sliding on any surface you want. Better if you come up with one that has this property on a standard ...
• 131
546 views

### Which lubricant (oil or not) to use if I want to prevent sticky/gummy buildup?

I am currently tinkering with typewriters and two things striked me when I started to read about their maintenance: They are supposed to run almost completely dry, except for a very tiny amount of ...
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