Multi-scale fatigue crack propagation: Experiment and modeling
Crack initiation and small crack propagation usually occupy most part of fatigue life.Characterization of small fatigue crack growth of metallic materials is very important for structural design and long-term operation of components.An experimental study of microstructural effect on the small fatigue crack growth behavior of 304 stainless steel is performed in this paper.It can be found that there are two different stages in small crack growth, namely microstructurally small crack and physically short crack.In these two stages, microstructure plays different roles in crack growth and results in different growth mechanics.As a result, a developed multi-scale model by combining Chan-Lankford model and a modified physically short crack model is used to describe this phenomenon.The multi-scale model achieves a good agreement in both stages.
Small fatigue crack Crack propagation model Microstructural dissimilitude Grain boundary
Shen Ye Shan-Tung Tu Xian-Cheng Zhang
Key Laboratory of Pressure Systems and Safety,Ministry of Education,School of Mechanical and Power Engineering East China University of Science and Technology,Shanghai 200237,China
国际会议
2015 International Symposium on Structural Integrity(2015年国际结构完整性学术会议)
沈阳
英文
69-78
2015-05-16(万方平台首次上网日期,不代表论文的发表时间)