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Tresca and von Mises are not brittle failure theories. They are for ductile materials. Thus, these two have been removed from the brittle section.

Hermanoere (talk) 17:58, 24 January 2012 (UTC)[reply]

If these are not valid for brittle materials, neither are any of the others that are listed because they are based on the same ideas. You probably mean to say that phenomenological failure criteria don't work very well. I've reverted the change. Bbanerje (talk) 21:09, 24 January 2012 (UTC)[reply]