Notch Effect



Almost all fatigue failures initiate at a notch or other structural discontinuities. Local notch tip stress and strain amplification depend on the shape and size of both the notch and the component, referred to as the system geometry. In real materials this amplification is lower that the theoretical stress concentration factor predicted by the linear elasticity theory and depends on the material and the notch tip stress gradient. This last factor determines the process volume interested by the localized high stress state that, in turn, determines the probability of existence of the defect that will trigger the fatigue failure.


Peak Stress Fatigue Limit Stress Concentration Factor Notch Root Process Volume 
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© Springer-Verlag Italia 2013

Authors and Affiliations

  1. 1.Department of Civil and Mechanical EngineeringUniversity of Cassino, ItalyCassino (Rome)Italy

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