Traditional Failure Criteria

Hey every one,

I had a look at the book 'Fracture Mechanics, an introduction' by E.E. Gdoutos, in the preface he talks about "Traditional Failure criteria" and how it's not capable of "adequately" explaining many structural failures and this shortcoming led to the emergence of fracture mechanics theory by Griffith.

But he doesn't really give an acount of what he (Gdoutos) means by "traditional failure criteria".

Could someone please explain me what is the "traditional fracture criteria" as oposed to new criteria introduced by fracture mechanics?

atop of that, would be great to introduce some links and references please.

Cheers,

Dude