Statistical Damage Tolerance for Cast Iron Under Fatigue Loadings

摘要

In this paper, a statistical model accounting for the presence of initial flaws is introduced to study the fatigue failure of Spheroidal Graphite cast iron. An expression of the cumulative failure probability of a structure is proposed for cyclic loading conditions. The proposed model uses a modified Paris' law and is valid when no new flaw nucleates during cycling. An identification procedure is developed to determine the flaw distribution as well as the crack growth law from a series of standard fatigue tests. A post-processing approach is developed to study the failure probability of any complex structure, and applied to analyze a suspension arm.