Coefficients of Friction for Polyethylene

[sloquick]

Can't find anywhere. Does anyone have typical values for MDPE-MDPE, MDPE-HDPE and HDPE-HDPE. Application is cable being pulled through conduit. Static? Dynamic? Variation with speed? Thanks!

 

[macPT]

How accurate do you need it?

tipical generic values (static)for plastic/plastic and plastic/steel: 0,3 to 0,6

tipical generic values (static)for PTFE/plastic and PTFE/steel: 0,05 to 0,1

From my experience, PA as low friction and good abrasion resistence.

Try

http://www.matweb.com

and

http://www.plasticweb.com

. Maybe you can get detailed information there.

Regards

 

[nigelt]

I have a similar problem with long pcb's in a poly carb tube extrusion.
The main issue as I see it is the level of uncertainty; how much of the item will be touching the tube and will there be any snags etc. These could make the calc error high.
Starting friction is probably the greatest concern; once things are moving force drops right off, I observe.
How about building a test setup that is long enough to allow most of the variables to be "at the party"?
Compare observations (I don't say results!) to any calcs you do and see where that takes you.
Have a look at thread in this forum re: friction of acetal and abs, for suggested info sources.
Cheers. "The ideal client is one possessed of great good sense and perfect judgement;
that is to say, one who agrees entirely with the designer at all times and in every respect."
Fenwick Williams, Naval Architect.

 

[sloquick]

Thanks you guys!