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Axial clamping force
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Posted by: Charlie3

05/01/2006, 17:30:47

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Probably an easy question, if I have qty of 6, 6-32 stainless screws clamping (compressing) something between 2 plates, is my "total clamping force 6 times that of one screw of ~ 382 in-lbs per screw?

Thanks





Thanks, Charlie


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Re: Axial clamping force
Re: Axial clamping force -- Charlie3 Post Reply Top of thread Forum
Posted by: Archetype Joint

05/15/2006, 13:44:28

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Charlie:
Ussuming you meant to say 382 lbf rather than in-lb yes the total clamp force is a multiple of the number of screws. The accuracy of your estimate is highly dependant on the friction factor (K) you assume which for stainless hardware can be quite high (leading to lower than expected clamp loads). If you are intested in this because you are trying to make a seal through the use of a gasket, know that the inevibable relaxation will degrade clamp force. Tests using pressure-sensive media or direct tension reading are avialable when trial and error isn't desireable.
Dave







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Re: Axial clamping force
Re: Axial clamping force -- Charlie3 Post Reply Top of thread Forum
Posted by: Kelly_Bramble Administrator

05/03/2006, 08:49:38

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Yes, your assumption is close enough. Keep in mind that plates are not perfect and that they do bend.

See the following page for an example of a installation where the full axial load of the fastenenrs does not distribute evenly.

/general_engineering/gasket_cover_compression.htm








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Re: Re: Axial clamping force
Re: Re: Axial clamping force -- Kelly_Bramble Post Reply Top of thread Forum
Posted by: elute

05/12/2006, 12:49:56

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I am having some similar issues and have looked at the bolt spacing equation; however I am a bit confused about Pmax and Pmin. What pressures are the equation referrring to? Is it the system pressure or the pressure applied by the clamping force of the bolts?







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Axial clamping force
Re: Re: Re: Axial clamping force -- elute Post Reply Top of thread Forum
Posted by: Kelly_Bramble Administrator

05/12/2006, 14:29:52

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Pmin and Pmax are stated on the referenced webpage as min and max gasket pressure.

This would be the max allowed pressure on the gasket and the minimum.








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