샤시부품에 대한 내구해석용 용접부 피로물성 도출에 관한 연구

The fatigue properties curve (S-N curve)of the chassis components is presented in this paper. The structural stress of weld joints edge is used for the amplitude stress of S-N curve. The structural stress is consistent with elementary structural mechanics theory and provides an effective measure of a stress state that pertains to fatigue behavior of welded joints in the form of both membrane and bending components. In order to consider the effect of mean stress, the mean stress correction has been calculated according to the FKM guideline. The S-N curve of standard fatigue specimens is compared with the S-N curve obtained from fatigue test of chassis components. The S-N curve from standard fatigue specimens is well correlated with the SN curve of chassis components. Therefore, the S-N curve obtained from standard fatigue specimens is expected to improve the reliability of the fatigue analysis of the chassis components.