Trees for profit
forags at nature.Berkeley.EDU
Fri Apr 18 11:49:54 EST 1997
Larry Caldwell (larryc at teleport.com) wrote:
: By strength I was referring to extreme fiber in bending strength. Oak is
: stiffer (higher modulus of elasticity) so isn't so springy. Oak has a
: higher compression strength perpendicular to the grain, I don't know about
: parallel to the grain.
According to the Wood Handbook (USDA Ag Handbook 72), coastal Doug Fir has a
maximum crushing strength parallel to the grain of 3780 psi green, and 7240
psi at 12% moisture. White oak is 3560 psi green, and 7440 psi at 12%.
1. Those are averages, no mention of confidence limits. Given wood's
natural variability I don't know if the differences are significant.
2. There are lots of other values for different species of oak, which would
give completely different conclusions. Same for Douglas-fir (various
Al Stangenberger forags at nature.berkeley.edu
Dept. of Env. Sci., Policy, & Mgt. 145 Mulford Hall # 3114
Univ. of California at Berkeley Berkeley, CA 94720-3114
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