科研之友
微信
新浪微博
Facebook
分享链接
摘要
By introducing effective fatigue stresses, multi-axial fatigue problems can be transformed into equivalent uni-axial problems. A damage evolution law has been proposed from the view of cyclic motion of atoms' balance position, and the life evaluation formula has been deduced for arbitrary cyclic stress combinations. It is found that both fatigue limit and proportional coefficient of life should be dependent on mean stresses. The relationship between fatigue limit and mean stress, and the relationship between the proportional coefficient and fatigue limit have been also proposed from uni-axial experimental results. The life evaluation formula has been examined by various uni-axial and multi-axial experimental results. It is found that the formula could estimate fatigue life well for any cyclic stress state with the use only of material's fatigue constants which can be determined by uni-axial tests.
- 出版日期2015-4
- 单位上海交通大学; 山东交通学院
