非共线多裂纹结构的剩余强度分析与评估  

Analysis and Assessment on Residual Strength of the Non-Collinear Multi-Crack Structures

作　　者：贾宝惠[1] 刘兆鹏 卢翔[1] 耿亚南 JIA Bao-hui;LIU Zhao-peng;LU Xiang;GENG Ya-nan(School of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学航空工程学院,天津300300

出　　处：《机械设计与制造》2024年第5期229-233,共5页Machinery Design & Manufacture

基　　金：国家自然科学基金民航联合基金重点支持项目(U2033209);2019年天津市研究生科研创新项目(2019YJSS073)。

摘　　要：针对老龄飞机的广布疲劳损伤(Widespread Fatigue Damage,WFD)评估问题,通过试验方法研究了不同结构参数对非共线多裂纹结构剩余强度的影响,修正原有剩余强度评估方法中的缺陷,提出改进的净截面屈服准则和改进的Irwin塑性区连通准则,获得更准确的评估结果。改进的净截面屈服准则评估结果误差小,适用范围广,可以评估铆钉孔间距和铆钉孔直径对结构剩余强度的影响;改进的Irwin塑性区连通准则在铆钉孔间距大于10mm时,有较准确的评估结果,还可以评估裂纹分布位置对剩余强度的影响。For the Widespread Fatigue Damage(WFD)assessment problem of aging aircraft,the influence of different structural parameters on residual strength of non-collinear multi-crack structures is studied by experimental methods,the defects of the ex-isting residual strength evaluation method are corrected,and an improved Net Section Yield Criterion and an improved Irwin Plastic Zone Linkup Criterion are proposed to obtain more accurate evaluation results.The improved Net Section Yield Criterion has small errors and a wide application range.It can be used to evaluate the influence of rivet holes spacing and rivet holes diam-eter on residual strength of structure.The improved Irwin Plastic Zone Linkup Criterion has more accurate evaluation results when rivet spacing is greater than 10mm,and it can also be used to evaluate the effect of crack location on residual strength.

关 键 词：广布疲劳损伤 试验分析 非共线裂纹 剩余强度 

分 类 号：TH16[机械工程—机械制造及自动化] V267.41[航空宇航科学与技术—航空宇航制造工程]