Fatigue Strength of Welded Joints in Very High Cycle Fatigue Region

本文以疲劳寿命大于1000万次的极高周疲劳区为研究对象，对焊接接头的疲劳强度进行了研究。使用弯曲疲劳试验机进行了非常高的循环疲劳试验，弯曲疲劳试验机可以由于电机中偏心质量的旋转而对试样施加高频循环载荷。试验结果表明，试样破坏时的最低应力范围约为60N/mm2，与高周疲劳区提出的疲劳极限基本一致。

In this study, focusing on the very high cycle fatigue region where fatigue life is more than ten million cycles, fatigue strength of welded joints was investigated.Very high cycle fatigue tests were performed by using a bending fatigue testing machine, which can apply cyclic loads with high frequency to specimens due to the rotation of an eccentric mass in a motor. The test results revealed that the lowest stress range when the specimen failed was about 60N/mm2, which is almost equivalent to the fatigue limit proposed in the high cycle fatigue region.