DZ125带小孔构件低循环/保载疲劳试验与分析
Experimental analysis of low-cycle and creep fatigue for directionally solidified DZ125 with a hole
-
摘要: 进行了定向结晶合金DZ125带小孔构件在高温下的低循环/保载疲劳试验.此构件试验用来部分模拟航空发动机气膜冷却的空心涡轮转子叶片, 试验方案根据空心涡轮转子叶片的几何特征和所承受的温度及载荷状况来设计.介绍了试验方案和试验结果分析, 包括寿命分析、试验裂纹扩展规律分析和金相分析.结果表明小孔应力集中和保载是构件破坏的主要原因, 孔边电火花加工特征对裂纹萌生起到决定性影响.Abstract: A low-cycle/creep fatigue test was conducted for directionally solidified DZ125 component with a hole under high temperature conditions.The purpose of this test was to simulate hollow turbine rotor blade for film cooling of aeroengine.The test scheme was planned according to geometric characteristics,temperature and load conditions of hollow turbine rotor blade.The test scheme and test results were described,covering ser-vice life analysis,crack expansion analysis and metallographic analysis.The results show that holes' stress con-centration and creep are major contributing factor to the damage of components,and electric discharge machine(EDM) hole features is decisive to the crack initiation.
-
Key words:
- aerospace propulsion system /
- DZ125 /
- directionally solidified /
- fatigue /
- creep /
- life
-
[1] 苏清友,孔瑞莲.航空涡喷/涡扇发动机主要零部件定寿指南[M].北京:航空工业出版社,2004. [2] 张晓兵,李其连.激光加工小孔工艺及其孔壁再铸层对DZ22高温合金疲劳性能的影响[J].新技术新工艺,1995,(2):20-22.ZHANG Xiaobin,LI Qilian.Laser drilling of small hole and the influence of recasting layer on fatigue per-formance of DZ22 superalloy[J].New Technology and New Process,1995,(2):20-22. [3] 汪浩.缺口曲率半径对30CrMnSiA钢疲劳萌生寿命的影响[J].机械制造与自动化,2003,(3):29-35.WANG Hao.The effect of notch curvature radius on fatigue life of 30CrMnSiA steel[J].Machine Building & Automation,2003,(3):29-35. [4] 刘灵灵,王建国.GH4169 缺口件多轴加载下应力应变场的有限元分析[J].物理测试,2005,23(3):11-13.LIU Lingling,WANG Jianguo.Stress-strain field FEM analysis for GH4169 notched specimens under multiaxial loading[J].Physics Examination and Testing,2005,23(3):11-13. [5] 罗毅,黄培彦,周希平.缺口件疲劳裂纹形成特性研究[J].华南理工大学学报,2006,28(6):34-38.LUO Yi,HUANG Peiyan,ZHOU Xiping.Research on fatigue crack formation of notched speci-men[J].Journal of South China University of Technol-ogy,2006,28(6):34-38. [6] Barter S,Molent L,Goldsmith N,et al.An experimen-tal evaluation of fatigue crack growth[J].Engineering Failure Analysis,2005,(12):99-128. [7] Meraha N,Bui-Quoc T,Bernard M.Creep-fatigue crack growth in notched SS-304 plates at 600℃[J].Engineering Fracture Mechanics,1999,(63):39-55. [8] Lukas P,Preclik P,Cadek J.Notch effects on creep be-haviour of CMSX-4 superalloy single crys-tals[J].Materials Science and Engineering,2001,(A298):84-89. [9] 石多奇,杨晓光,王延荣.耦合蠕变损伤的Chaboche粘塑性本构方程的应用[J].航空动力学报,2005,20(1):60-65.SHI Duoqi,YANG Xiaoguang,WANG Yanyong.Applied investigation of chaboche's unified visco-plastic constitutive model of coupled creep dam-age[J].Journal of Aerospace Power,2005,20(1):60-65.
点击查看大图
计量
- 文章访问数: 1411
- HTML浏览量: 2
- PDF量: 451
- 被引次数: 0