Solution to loose coiled spring with force applied radial from inside 1

[JasonNicholson]

I need to find a solution to a loosely coiled spring with a force applied from the inside radial outward. Any suggestions?

 

[israelkk]

What type of coiled spring? Similar to compression spring? Are you intend to push a cylinder into the inside diameter?
Is this for spring clutch?

http://israelkk.googlepages.com/home

 

[JasonNicholson]

The spring only works in tension, similar to a spring you pull out of a pen after it has been stretched beyond yeild. Small amounts of compression will cause it to buckle.

The spring is loaded by putting a cylinder inside the diameter. I want to predict the force (normal force/unit length of spring) the spring will produce on the cylinder based on the unloaded diameter of the spring and the loaded diameter of the spring.

No this is not for a spring clutch.

 

[israelkk]

In the book "Mechanical Analysis and Design, Arthur H. Burr, 1981. page 101" (the chapter of coil spring clutch) is given the pressure between the coils and the cylinder inside as function of the spring diameter increase as the result of the presence of the cylinder.

From this pressure and the coefficient of friction you can calculate the friction force. However, since not all coils will slip together you may have a very erratic behavior because you also stretch a spring with variable coil numbers resulting with variable spring constant and deflection per unit force.

http://israelkk.googlepages.com/home

 

[JasonNicholson]

Is this the correct book?

Mechanical Analysis and Design

 

[israelkk]

Yes this the book why are you asking?

 

[JasonNicholson]

I am think of buying it but its publishing date is not 1981. It is 1995. So I want to make sure I had the right book.

 

[israelkk]

There is 1981 edition and 1995 edition. To my opinion the 1981 is better at least concerning the spring clutch chapter.