You would have thought this was easy to get information about but all I can find is repetitive waffling telling me what I already know but no actual comparative figures.
I (think I) know as follows:-
Timber is somewhat stronger lengthwise than plywood for bending Plywood is much stronger than timber across the grain OSB is probably similar to plywood (but how close is it?)
I actually found one bit of quantitative information on this:-
I can find no actual values for the relative strength of OSB (sterling board) compared with plywood or ordinary planks.
What I **really** want to know is how much stronger ordinary timber is than comparable thickness plywood or OSB. It would also be quite good to know how much stiffer it is (not quite the same thing) but that's probably a bit less important.
This doesn't have to be accurate to the n'th degree, but I do want some sort of quantitive indication, like is ordinary wood twice as strong as plywood and OSB, or only 10% stronger, or what? (OK, there's lots of variables but the US Forest Service managed the sort of thing I wanted back in 1952!)