Changed my hammer design DAMMERR 2.0
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Larry

Trad climber
Bisbee
Jul 3, 2015 - 06:41pm PT
Which way did the grain...er, growth rings...run?

http://www.supertopo.com/climbing/thread.php?topic_id=2491560&msg=2568649#msg2568649
Banquo

climber
Amerricka
Topic Author's Reply - Jul 3, 2015 - 07:17pm PT
Larry,

The grain is oriented the weak way for shear but doesn't matter for bending and the handle failed in bending. The orientation of the growth rings in an extremely dense hardwood like hickory doesn't really matter a great deal - perhaps a 10% difference in shear strength for planes parallel to growth rings and grain as opposed to perpendicular to growth rings and parallel to grain. Shear strength in either of the two orientations perpendicular to the grain is so high that it isn't ever considered in wood engineering.

Anyway, the orientation of the growth rings isn't a factor in bending stresses parallel to the grain which is what I believe is the failure mode.

In this photo, the wide faces of the handle are on the top and bottom.

.
jeff constine

Trad climber
Ao Namao
Jul 3, 2015 - 07:26pm PT
Looks pretty, but I know It won't last a week with me. My BD hammer will out last it by decades.
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