Prediction of crack growth life 2A97-T3 lithium aluminum alloy under Mini-Twist load spectrum

2nd International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Tong, Dihua^1 ; Ma, Shaojun^1 ; Zhang, Lina^1 ; Li, Liyun^1 ; Lan, Tianxiang^1

Beijing Institute of Aeronautical Materials, Beijing

100095, China^1

关键词: Aircraft structure;    Closure models;    Constant amplitude;    Crack growth life;    Damage tolerance designs;    Fatigue crack growth behavior;    Paris equations;    Spectrum loading;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/490/2/022006/pdf
DOI  :  10.1088/1757-899X/490/2/022006

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

An important aspect of life analysis and damage tolerance design of modern aircraft structures is a reasonable model and method for prediction of fatigue crack growth behavior and growth life under actual flight spectrum loading. Mini-Twist load spectrum and constant amplitude crack propagation curves test have been conducted towards the 2A97-T3. Coefficients of Paris equation and Walker equation for constant amplitude crack propagation curves are given. The Wheeler retardation model and AFFDL closure model are used to predict the aboved crack growth life. The predicted results of Wheeler retardation model and AFFDL closure model agree well with the experimental results.