叶片外物损伤的实验模拟及其疲劳强度的研究

推进技术 ›› 2014, Vol. 35 ›› Issue (3): 403-407.

叶片外物损伤的实验模拟及其疲劳强度的研究

刘超,赵振华,陈伟

南京航空航天大学能源与动力学院,江苏南京 210016;南京航空航天大学能源与动力学院,江苏南京 210016;南京航空航天大学能源与动力学院,江苏南京 210016

发布日期:2021-08-15
作者简介:刘超(1988—),男,硕士生,研究领域为疲劳损伤与寿命评估。E-mail:liuchaonuaa@163.com通讯作者:赵振华(1979—),男,博士,讲师,研究领域为结构强度、冲击损伤与疲劳。E-mail:zhaozhenhua@nuaa.edu.cn

Investigations into Simulation Test and Fatigue Strength of Foreign Object Damage of Blades

College of Energy and Power, Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;College of Energy and Power, Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;College of Energy and Power, Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

Published:2021-08-15

摘要/Abstract

摘要： 研究了空气炮法模拟外物损伤叶片的可行性,分析了外物损伤对模拟叶片疲劳强度的影响规律。用空气炮发射以300m/s左右速度发射直径1~4mm的钢珠,冲击模拟叶片,空气炮法在发射速度控制和撞击缺口深度方面具有较强的可控性及可重复性。采用光学和扫描电子显微镜对外物损伤的宏观和微观特征进行了观察,冲击损伤处具有材料丢失、塑性变形、剪切撕裂、应力集中、微裂纹、空穴结构和材料的折叠等特征。采用步进法对部分外物损伤模拟叶片进行了高周疲劳强度测试,试验结果比较分散,且冲击损伤引起的高周疲劳强度下降不随缺口深度的增加而单调变化,表明物损伤模拟叶片的疲劳强度是受缺口的宏观特征、微观特征等综合因素的影响。 

关键词: 叶片;外物损伤;步进法;疲劳强度 

Abstract: The validation of foreign object damage (FOD) of blades simulated by the gas gun and the effects of FOD on the fatigue strength of simulated blades are investigated. The specimens are impacted by the steel balls with different diameters of 1mm, 2mm, 3mm and 4mm at about 300m/s, which shows good repeatability and control in impact velocity and depth of dent after impact. The macroscopic and the microcosmic feature of the dent are observed through optical and scanning electronic microscopy .The features like material loss, plastic deformation, shear tear, stress concentration, micro notch, droplet structure and material fold etc. are obviously found in the impact area. Then the High Cycle Fatigue test of the typical specimen is done by the step-test method and fatigue strength of simulated FOD blade exhibits a relative scatter trend. It is found that the strength of the specimen does not change monotonously along with the depth of the dent. It means that the strength of the specimen is influenced by various factors, such as the macroscopic and the microcosmic feature of the dent. 

Key words: Blade; Foreign object damage; Step-test; Fatigue strength

刘超,赵振华,陈伟. 叶片外物损伤的实验模拟及其疲劳强度的研究[J]. 推进技术, 2014, 35(3): 403-407.

LIU Chao,ZHAO Zhen-hua,CHEN Wei. Investigations into Simulation Test and Fatigue Strength of Foreign Object Damage of Blades[J]. Journal of Propulsion Technology, 2014, 35(3): 403-407.

参考文献

[1] 关玉璞,陈伟,高德平.航空发动机叶片外物损伤研究现状[J].航空学报, 2006,8(4):851-857.
[2] Theodore Nicholas.High Cycle Fatigue:A Mechanics of Materials Perspective[M].UK:Elsevier Ltd, 2006.
[3] 胡绪腾.外物损伤及其对钛合金叶片高循环疲劳强度的影响[D].南京:南京航空航天大学,2009.
[4] Ritchie R O, Peters J O.Foreign Object Damage and High Cycle Fatigue of Ti-6Al-4V[J].Materials Science and Engineering,2001,A319-321:597-601.
[5] Ruschau J J, Nicholas T, Thompson S R.Influence of Foreign Object Damage (FOD) on the Fatigue Life of Simulated Ti-6Al-4V Airfoils[J].International Journal of Impact Engineering,2001,5:233-250.
[6] Ruschau J J, Thompson S R, Nicholas T.High Cycle Fatigue Limit Stresses for Airfoils Subjected to Foreign Object Damage[J].International Journal of Fatigue, 2003,5(9):955-962.
[7] Shankar Mall.High Cycle Fatigue Behavior of Ti-6Al-4V with Simulated Foreign Object Damage[J].Mechanics of materials, 2001,3:679-692.
[8] Oakley S Y,Nowell D.Prediction of the Combined High- and Low-Cycle Fatigue Performance of Gas Turbine Blades After Foreign Object Damage[J].International Journal of Fatigue, 2007,9(1):69-80.
[9] Davis T, Ding J, Sun W, et al.Computational Simulation of the Relaxation of Local Stresses Due to Foreign Object Damage Under Cyclic Loading[J].Journal of Materials:Design and Applications, 2010,4(2):41-50.
[10] Spanrad S, Tong J.Characterization of Foreign Object Damage (FOD) and Early Fatigue Crack Growth in Laser Shock Peened Ti-6AL-4V Aerofoil Specimens[J].Materials Science and Engineering, 2011, A528:2128-2136.
[11] Birkbeck J C.Effects of FOD on the Fatigue Crack Initiation of Ballistically Impact Ti-6Al-4V Simulated Engine Blades[D].Dayton:University of Dayton,2002.
[12] Maxwell D C, Nicholas T.A Rapid Method for Generation of a Haigh Diagram for High Cycle Fatigue[J].Fatigue and Fracture Mechanics, 1999,9:626-641.
[13] Moshier M A, Nicholas T, Hillberry B M.The Effect of Low Cycle Fatigue Cracks and Loading History on High Cycle Fatigue Thresholds[J].ASTM Special Technical Publication, 2000,9:427-444.