基于损伤力学阐释Manson-Coffin低周疲劳模型  

Interpretation of Manson-Coffin Model of Low Cycle Fatigue Based on Damage Mechanics

作　　者：郑战光[1] 蔡敢为[1] 李兆军[1] 徐细勇[1] 

机构地区：[1]广西大学,南宁530004

出　　处：《中国机械工程》2011年第7期812-814,共3页China Mechanical Engineering

基　　金：广西科学基金资助项目(桂科自0832030);广西制造系统与先进制造技术重点实验室资助项目(桂科能0842006-005-Z)

摘　　要：为验证Manson-Coffin低周疲劳模型经验公式,采用损伤力学基础理论,并结合Ramberg-Osgood幂率强化准则,以塑性应变幅值为损伤演化的控制量,推导建立了低周疲劳损伤力学模型。比较两者后可得:在比例载荷的条件下,Manson-Coffin低周疲劳模型与疲劳损伤力学模型是等价的,且Manson-Coffin公式是疲劳损伤力学模型的一种特殊的退化形式。Manson--Coffin model of low cycle fatigue is a classical empirical formula, and its mechanical implications are very pool. Based on damage mechanics and Ramberg--Osgood rule, a damage mechanics model of tow cycle fatigue was deduced under the dominate variable of plastic strain amplitude. By the comparison with Manson--Coffin model, it is shown that they are equivalent under proportional loading and Manson--Coffin model is a special degenerative form of damage mechanics fatigue model.

关 键 词：低周疲劳 损伤力学 等价 比例载荷 

分 类 号：O346.2[理学—固体力学]