how to define number of layers


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tomzi1234
tomzi1234
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hi

does anyone have answer to how to define nr. of layers to obtain desired strength of object.

i would like to do seat post tube for my MTB.
so how to define what would be the minimum amount of layers that tube will still support my weight and not to have too much of not needed weight.

i know there is no 100% accurate way, but at least a point to start
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Zorongo
Zorongo
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I would analize from the stress type point of view.

You´ll have a compression along the tube owed to your weight and bumps / jumps if Btt. (no flexions nor torsions, right?)

AND it´ll have a local, perpendicular compression owed to the frame´s attachement.



If If would want to make the lightest tube, I would do a thin laminate for the compression on the whole tube, and then a local thickness increase for the attachement area.

For the compression, a low thickness will be enough. As mentioned, 70/30 for 0º/90 is comon for compression tubes at least on marine field.

I would do a few trails and test it. First for compression and then local reinforcement.



About how much.... you can make one long tube with different thicknesses (1.0, 1,1 and 1,2 for instance) and then cut and test.

For the local reinforcement I would make it about 80 mm high. About 30% Fibre 90º to tube´s axis for that local compression. And then another 70% +/- 45º to spread the stress.
thickness.... another 0,5 or 0,6 mm and then test (you can ask your heaviest enmy, lol)

Both tests are easy to do at home.... so, try and error may be a good strategy !
GO

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