摘要
针对飞机结构实际使用的载荷历程偏离耐久性评定试验载荷谱情况下的耐久性分析需求,建立了疲劳关键部位耐久性损伤程度的当量应力损伤计算方法,通过构建不同载荷谱下的结构耐久性损伤关系,得到了结构疲劳关键部位在不同载荷谱下的等效应力;结合耐久性分析的概率断裂力学方法,建立了一种基于当量应力损伤的耐久性分析方法。该方法已成功应用于某新型飞机疲劳关键部位的耐久性设计分析,具有重要的工程应用价值。
In order to meet the requirements of durability analysis when the load history used in aircraft structures deviates from the test load spectrum of durability assessment,an equivalent stress damage calculation method is proposed to describe the durability damage degree on the fatigue critical parts.By constructing the durability damage relationship under different load spectrum,the equivalent stress on key fatigue parts of structures under different load spectrum is obtained.Then,combining with probabilistic fracture mechanics method of durability analysis,a durability analysis method based on equivalent stress damage is established.This method has important engineering application value,and has been successfully applied to the durability design and analysis on the fatigue critical parts of a new aircraft.
作者
蔡永明
陈亮
王成波
赵通
Cai Yongming;Chen Liang;Wang Chengbo;Zhao Tong(AVIC Shenyang Aircraft Design and Research Institute,Shenyang 110035,China)
出处
《航空科学技术》
2022年第3期65-70,共6页
Aeronautical Science & Technology
关键词
飞机结构
耐久性
当量应力损伤
概率断裂力学
经济寿命
aircraft structures
durability
equivalent stress damage
probabilistic fracture mechanics
economic life
