摘要
运用弹塑性有限元法对４０Ｃｒ钢经激光局部强化前后材料的缺口局部应力应变场进行理论分析．对于强化层内存在的残余压应力按初应力考虑计及其对疲劳裂纹萌生的影响．选取形变功密度于潜在萌生裂纹长度上的平均值作为描述疲劳损伤的控制参量，建立其与萌生寿命之间的宏观规律，为强化材料的寿命估算提供依据．
The notch strain and stress of local laser hardened 40Cr steel was calculated with elastoplastic finite element method. The effect of residual compressive stress within laser hardened layer on fatigue crack initiation life can be treated as initial stress problem. As a fatigue damage parameter, the mean deformation work density on the defined initiation fatigue crack length is related with fatigue crack initiation life. This relationship is useful for fatigue life evaluation upon laser hardened materials.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1997年第3期274-278,共5页
Journal of Northeastern University(Natural Science)
基金
冶金部教育司基础研究基金
关键词
疲劳寿命
有限元
铬钢
激光强化
Cr steel, laser, fatigue life, finite element.
