EFFECTS OF CYCLIC LOADING ON BRITTLE FRACTURE IN STEEL NOTCHED SPECIMENS WITH DIFFERENT FRACTURE TOUGHNESS

摘要

This paper describes the effects of cyclic loading on brittle fracture. Steel notched specimens with different fracture toughness values were tested under monotonic loading and other two types of cyclic loading. It was found that as deflection amplitude increases, cumulative plastic deformation prior to brittle fracture decreases in approximately inverse proportion although cumulative plastic deformation values show wide scatter. The results suggest a possibility that the Weibull stress can be used to evaluate the occurrence of brittle fracture under various loading conditions.