南京航空航天大学学报2013，Vol.45Issue(1)：28-32,5.
铝合金板广布疲劳损伤载荷谱加重的数值分析
Numerical Analysis on Load Spectrum Enhancement of Widespread Fatigue Damage in Aluminum Alloy Panel
王芳丽 1童明波 1王欢欢 1朱书华1
作者信息
- 1. 南京航空航天大学飞行器先进设计技术国防重点学科实验室,南京,210016
- 折叠
摘要
Abstract
Based on 45-hole specimens load enhancement experiments of the LY12-CZ aluminum alloy, the elastic finite element models are established. The interaction factor near the crack front of widespread fatigue damage and the crack propagation of load enhancement are analyzed systematically. The results indicate that the interaction factor β increases with the increasing αj and the decreasing αi for 2 variable factors, while decreases with the decreasing αj, αk and the increasing αi for 3 variable factors. Additionally, β is no change with the load enhancement, since the result of finite element analysis(FEA) is linear elastic analysis. The ratios η(Δα1.2/Δα) are calculated by FEA, structural fatigue rated factor method and structural detail number effect coefficient method. Their results are similar when Δα and Pmax are small and the multi-cracks can be regarded as independent crack propagation. While Δα and Pmax are quite large, crack growth ratio increases rapidly, and the FEA prediction is better.关键词
广布损伤/载荷谱加重/相互影响因子/裂纹扩展Key words
widespread fatigue damage/ load spectrum enhancement/ interaction factor/ crack propagation分类
航空航天引用本文复制引用
王芳丽,童明波,王欢欢,朱书华..铝合金板广布疲劳损伤载荷谱加重的数值分析[J].南京航空航天大学学报,2013,45(1):28-32,5.
