gravelld

Can Compacfoam take the load? Compressive strength calculations

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Can someone check my calculations are right?

 

I have a slider - depth 174mm, length 4500mm. Weight is 405kg (3924N).

 

174 * 4500 = 783000mm2 (I assume it's the surface area of the weight rather than the CF that is used).

 

The compressive strength of CF200 is 1.01N/mm2 - http://www.compacfoam.com/26-compressive-strength.html http://www.wiki-compacfoam.info/wiki/dichteklassen

 

So 783000mm2 means it can cope with over 790830N and so... easily?

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The weight of the window will often be held by chocks or packers so the effective bearing is hugely reduced.  Your slider is less than 100kg per linear metre. A single skin single storey blockwork wall is about 500kg per linear metre. All looks fine.

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1 hour ago, gravelld said:

Weight is 405kg (3924N)

 

Trivial and irrelevant, but how do you convert a mass of 405 kg to a weight of 3924 N? That would imply a gravitational force of ~9.688 N/kg (i.e., an acceleration of 9.688 m/s²). The more usual figure to use is 9.81 N/kg so the weight would be ~3973 N. Is there a 405 vs 400.5 kg confusion in here somewhere?

 

Or are you in another Leicestershire on a slightly lighter or less dense planet, but still with a higher surface gravity than that of Venus where CF would presumably melt, anyway.

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Eeep, copied the wrong figures across - I included some extra frames either side in the mass but forgot to update the N. Thanks Ed.

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