Fatigue Strength of Welded Joints in Very High Cycle Fatigue Region

极高周疲劳区域焊接接头的疲劳强度

• 批准号: 24656277
• 负责人: HANJI Takeshi
• 金额: $ 2.58万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-24656277/
• 关键词: 超高サイクル疲労; 溶接継手; 鋼橋

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.

本研究以疲劳寿命超过千万次的超高周疲劳区域为研究对象，利用弯曲疲劳试验机对焊接接头进行超高周疲劳试验。弯曲疲劳试验机通过电动机偏心块的旋转，对试样施加高频率的循环载荷。试验结果表明，试样失效时的最低应力范围约为60 N/mm ~ 2，与高周疲劳区的疲劳极限相当。