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span strength of 1" plywood

span strength of 1" plywood

span strength of 1" plywood

(OP)
Hello,

I would like to know if I build a 2'2'96" box out of 1" plywood sheathing (think diy altitude test chamber) would it be able to withstand a 4psi differential.  I am looking at testing products at no greater than a simulated 9000 ft.

Thanks

RE: span strength of 1" plywood

Matlark:

Dig out your old Strength of Materials text and do a little reading and math.  4psi is 576 lbs./sq.ft. on a 2' span from side to side.  What bending stress in 1" thick mat'l.?  Then, each sheet also has a 576 lb./ft. of length compressive (column) loading on it.  1" plywd. probably won't work.  You might be better off seeing if you can find a piece of 2 or 2.5' dia. thick walled pipe, 8' long, and putting appropriate ends on that for your test chamber.

RE: span strength of 1" plywood

(OP)
Thanks.  From my research I didn't think it would work, but I thought I would get a second opinion.   

RE: span strength of 1" plywood

Thin-wall pipe and 1/4" to 3/8" end plates will work for that small a vacuum.

RE: span strength of 1" plywood

Go to APAwood.  They are the authority.  4 psi is actually quite a bit - 576 psf.

Good luck.

RE: span strength of 1" plywood

A long time ago I was making some vacuum form tooling from plywood. Ended painting the whole thing with a couple of coats of laminating resin. The plywood wouldn't HOLD a vacuum:)

Regards,

Mike  

RE: span strength of 1" plywood

(OP)
Thanks for all the replies.  What would be the minimum thickness of steel plate I could get away with?

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