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# Re: Friction Steel Clamp calculation

• To: seaint-seaosc(--nospam--at)mail-list.com
• Subject: Re: Friction Steel Clamp calculation
• From: Paul Blomberg <paul.blomberg(--nospam--at)gmail.com>
• Date: Thu, 2 May 2013 12:05:13 -0700
• List-subscribe: <mailto:SEAINT-SEAOSC-on@mail-list.com>

```Going back to my old physics lab, friction force is not a function of
surface area.  It is the clamping force times the coefficient of friction.
Adheresion is a function of surface area.  I'm not familiar with the term
'friction stress'.

Paul.

On Thu, May 2, 2013 at 6:03 AM, David Cohen (Baran Raviv) <
dcohen(--nospam--at)barviv.co.il> wrote:

> Dear everyone
> When calculating the friction resistance of a clamp tight with bolts
> around pipe, the axial force has to be divide by the contact area in
> order to get the friction stress. This stress divide by the friction
> factor should give a tight stress that the clamp would apply on the pipe.
> By this way this stress will give us the forces in bolts, by dividing it
> with the contact area again. And then the contact area is no longer a
> factor for the friction resistance of the clamp, and closing UBolts will
> give the same results.
>
> Is anyone of you have any experience in these kind of calculation, I will
> be great to receive information and guidelines for this
>
> Thanks
>
> David C.
>
>

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