Fatigue Crack Growth Rate of an Al-Cu-Mg Alloy

4th International Conference on Advances in Energy Resources and Environment Engineering

能源学;生态环境科学

He, Jun^1 ; Liu, Yilun^1 ; Liu, Chi^1 ; Wang, Qing^1 ; Ma, Liyong^2

College of Mechanical and Electrical Engineering, Central South University, Changsha, Hunan

410083, China^1

School of Mechanical Engineering, Hebei University of Architecture, Zhangjiakou, Hebei

075051, China^2

关键词: Al-Cu-Mg alloys;    Crack closure effects;    Fatigue striations;    SEM image;    Stress intensity factor range;    Stress ratio;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/237/3/032122/pdf
DOI  :  10.1088/1755-1315/237/3/032122

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

In this study, fatigue crack growth rates of industrial 2524-T3 aluminium alloy plates under various stress ratios R (R = 0.1, 0.2, 0.3, and 0.5) were examined. The microstructure was observed by using a scanning electron microscope (SEM). The results showed that, for a given stress intensity factor range ΔK, the increase in stress ratio led to an increase in fatigue crack growth rate. Besides, the SEM images showed that the fatigue striations were predominant in the fracture, and the spacing of the fatigue striations also drastically increased as the stress ratio increased in different samples. This phenomenon can be explained well by crack closure effects.