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I'm trying to carryout some analysis of flat plates subjected to hydrostatic water pressures however the plate material is HDPE.

The problem I'm having is that all the formulae on the web and in Roark's 7th Edition are typical of steel with a Poisson's ratio of 0.3. I can't therefore find how to change the formulae or constants to account for the larger Poission's ratio that would be expected with HDPE (0.38-0.4).

To keep things simple I'm just considering a rectangular plate with fixed edges and a uniform UDL over the whole area as opposed to a triangulated load.

Can anybody offer advice on how best to deal with the stress and deflection of an HDPE plate?

Thanks in advance...

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# Flat Plate Deflection & stress - HDPE

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