Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 02, 2019 - November 04, 2019
The fatigue testing was conducted on the single spot-welded tensile shear joints under two-stage multiple block loadings. From the results, S-N curve below fatigue limit was prepared by Seki's proposed method, and was compared with the S-N curve based on the Minor's rule. The main conclusions are as follows. (1) L-N curve for the entire level of loading including one below the fatigue limit could be obtained based on the linear cumulative damage law using the results of two-steps multi block fatigue testing. (2) Variable amplitude fatigue testing was conducted under different loading conditions and the generality of the proposed L-N curve was clarified. (3)The proposed L-N curve almost agreed with the L-N curve based on modified Minor's rule. (4) Equivalent stress was able to arrange all fatigue testing results within a narrow band, regardless of sheet thickness, joint type, constant amplitude loading, and variable amplitude loading.
