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Strength of wood vs thickness

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Insect

Active Member
Joined
Nov 5, 2019
Messages
26
I find occasionally in reading old plans, that they may call for 1/8" birch for example for a gusset, whatever it may be. Just trying to learn, is there a test regimen or chart that demonstrates that wood loses strength greatly past a certain thickness? I understand thin plywoods, their solving one problem by crossing grains, but in just boards of poplar, birch, etc, that have gone thru a planer to reduce, I imagine the rings weak section will eventually become nothing. or it becomes linear with tensile properties, but very weak in the X and different in the Y, some kind of nonlinear result pattern. I speculate it isn't prudent to go below 2mm in anything, just a guess.

I seek the experienced or scientific wisdom here to illustrate to me with greater clarity.
Thanks
 
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