Fatigue Strength in Presence of Inhomogeneities: Influence of Constraint

摘要: The effect of defects on the entity fatigue limit is nowadays well known and demonstrated to be equivalent nonpropagating condition short cracks. influence constraint at defect tip has been addressed in present paper considering a mild steel whose mechanical behavior experimentally determined together with propagation threshold values for long activity first dealt determination Kitagawa diagram by means tests using specimens containing micro-notches different shapes (drilled holes narrow slits). Experimental results showed significant shape thresholds. In order understand reasons, have then analyzed elasto-plastic FEM analyses. Computational confirmed difference global factor crack between round defects.