influence-of-conditions-at-the-crack-tipMaterial propertiesKIC; KISCC; da/dN = f( K) Crack sizeOperating loadsStress levels at the cracktip (stress intensity "K") Factors required for fracture-mechanicalevaluationsK = . . a . Corrections for - crack type - surface - background - plastic zone - width factor2aThe conditions at the crack tip are decisive forthe crack behavior. This is explained by thefracture mechanics. aInner crackSurface crack