Plain and notch fatigue strength of thick-walled ductile cast iron EN-GJS-600-3: A double-notch critical distance approach to defect sensitivity

In some fatigue critical scenarios, like those arising in cast or additively manufactured components, the fatigue damage mechanisms prevailing in plain and notched components might be different. This could hinder the applicability of the theory of critical distances (TCD), which postulates that the critical distance L can be inferred from a plain and a notched or cracked specimen configuration. To overcome this shortcoming, we explore in this work the possibility of inferring L from two notched geometries with different notch severity. The proposed method is applied to the notch fatigue prognosis of the ductile cast iron EN-GJS-600–3.