摘要
通过对疲劳裂纹尖端应力－应变的分析，提出了一种新的ΔＫｅｆｆ的定义，给出了确定ΔＫｅｆｆ的解析模型。将其应用于不同材料数据的分析，结果表明，该模型能够很好地描述疲劳裂纹的闭合效应，并能够给出裂尖附近的应力－应变响应，从而为更加合理地分析疲劳裂纹的扩展提供了重要的依据。
A new definition of ΔK eff and an
analytical approach to detemine the ΔK eff are proposed in the present paper based on the
stress strain analysis at a fatigue crack tip.Applying this model to the analysis of fatigue crack
propagation data shows that a good description of the closure effect of a fatigue crack can be
given. The stess strain responses at a fatigue crack tip can also be obtained by this model,
providing an important base for a more resonable analysis of fatigue crack propagation.
出处
《机械科学与技术》
CSCD
北大核心
1999年第3期383-385,389,共4页
Mechanical Science and Technology for Aerospace Engineering
关键词
裂纹闭合
应力强度因子
疲劳裂纹扩展
解析模型
Crack closure Effective stress intensity factor Fatigue crack propagation Strain fatigue
