改进的军机细节疲劳额定值方法研究  

Research on Improved Detail Fatigue Rating Method for Military Aircraft

作　　者：廖宇 舒茂盛 聂凯 Liao Yu;Shu Maosheng;Nie Kai(AVIC Chengdu Aircraft Design&Research Institute,Chengdu 610091,China)

机构地区：[1]航空工业成都飞机设计研究所,四川成都610091

出　　处：《航空科学技术》2022年第6期20-27,共8页Aeronautical Science & Technology

摘　　要：基于军机细节疲劳额定值(DFR)方法的基本定义,本文对大量研制性试验结果进行数据分析,并对影响结构细节疲劳寿命的主要因素展开研究,在民机DFR方法中的细节修正系数的基础上,按制造工艺类、材料类、结构细节特征类重新定义了8个细节修正系数,并提出了改进的军机DFR方法。通过试验数据的对比分析获得细节修正系数,并以少量分散性较小的试验数据为基础对多种材料及细节类型的DFR_(base)值进行修正和仿真。通过开发简易快捷的小工具,实现结构快速的耐久性分析,并给出结构细节的疲劳裕度和可靠性寿命。该方法可以极大地提高结构细节优化、超差处理和机群使用状态变化后的寿命评估效率。Based on the basic definition of military aircraft Detail Fatigue Rating(DFR) method, a large number of test results and key factors influencing the fatigue life of detailed structure are analyzed. On the basis of the detailed correction factors used in DFR method for civil aircraft, 8 modified factors are redefined by characteristics of manufacturing process, materials, and structural details. An improved DFR method for military aircraft is developed.The detailed correction factors are obtained by comparative analysis of test data. The DFR _(base) values of various materials and detailed types are modified and simulated based on a small amount of test data with little dispersion.With the convenient tools developed, fast durability analyses can be achieved, and fatigue allowance as well as fatigue life with certain reliability could also be determined. The proposed method is expected to significantly improve the structural detail optimization, out of tolerance management and fatigue life assessment for fleet with changing usage.

关 键 词：结构细节 修正系数 疲劳裕度 可靠性寿命 细节疲劳额定值 

分 类 号：V215.5[航空宇航科学与技术—航空宇航推进理论与工程]