What does small scale yielding mean in fracture mechanics?

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Homework Statement



Can someone please explain to me the meaning of the term 'small scale yielding'?

Homework Equations





The Attempt at a Solution



I know it's in the field of fracture mechnics and has something to do with the stress at the crack tip but i don't have any idea what it means.

Thank you
 
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small scale yeilding is the idea that non-linear effects such as crack tip plasticity, blunting and micro defects are contained within the zone characterized by the linear elastic region