Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 02, 2019 - November 04, 2019
In this paper, fatigue tests of the base metal of cold rolled steel sheet SPCE and high tensile strength steel sheets SPFC 590 and SPFC 980 were conducted, and these results were compared with fatigue life prediction by Lemaitre's 2 scale damage model. A specimen for completely reversed fatigue test of thin steel sheet was designed. From the results of static loading and unloading tensile test, the threshold values of tensile plastic strain at which damage begins to occur were within the range of 60 to 150 μ for all three kinds of steel sheets. Using the ratio of the tensile strength and the stress amplitude, the fatigue life of the base metal was systematically arranged regardless of the tensile strength. The fatigue damage model of Lemaitre was able to estimate the fatigue life of the steel sheet within the range where the fatigue limit was fatigue strength at 106 cycles.
