Pressure caused by winding a cable under tension

[GeorgeEllwood]

Hello, I was hoping someone could help me out with this question. We're going to be winding a flat cable around a circular spool at a certain constant tension. I would like to be able to calculate the pressure on the spool caused by winding at tension. Is there an analytical formula that could deal with this? Or does any one have any pointers where to start.
Cheers
George

 

[prex]

If there are n turns over a length L of the cylinder, with
T=tension load in the cable
D=spool diameter
the pressure is
P=2nT/DL
This doesn't account for any settlement of cable and assumes a fully stiff spool.

prex

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[israelkk]

Prex

Isn't it only the maximum local pressure at the beginning of the loop. The pressure variates on the circumference of the drum as a function of the exponent of the friction coefficient between the cable and the drum multiplied by the looping angle across the circumference (0 to 360 degrees).

P=Po*EXP(Mu*Theta)

Po = The pressure in your post.

See Mechanical Analysis and Design By Arthur H. Burr 1982 pages 94,
95

 

[prex]

israelkk, my formula is for the uniform radial pressure exerted on the spool outer surface by a fairly high number of complete turns of a cable wound under tension. That's the way I understood the question by GeorgeEllwood.

prex

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: Online tools for structural design

http://www.megamag.it

: Magnetic brakes for fun rides

http://www.levitans.com

: Air bearing pads

 

[GeorgeEllwood]

Hello Prex and Israelkk, thank you for the replies. I've put a picture of the problem I'm trying to solve here:

http://www.eng-external.rl.ac.uk/aam/td-g022-001.jpg

We're wrapping a flat cable around a former with circular ends. What I'm concerned with is the pressure on the cable insulation between the cable and the former. My concern is the maximum pressure which I believe occours at the very top, and the effect of subsequent layers of cable.
Cheers
George