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吴英龙,宣海军,单晓明.基于断口分析的钛合金轮内部缺陷损伤容限[J].航空动力学报,2020,(2):358~367
基于断口分析的钛合金轮内部缺陷损伤容限
Damage tolerance of titainum alloy wheel with internal defects based on fracture analysis
投稿时间:2019-09-30  
DOI:10.13224/j.cnki.jasp.2020.02.015
中文关键词:  损伤容限  内部缺陷  钛合金轮  断口分析  裂纹扩展
英文关键词:damage tolerance  internal defects  titanium alloy wheel  fracture analysis  crack propagation
基金项目:民机专项研究项目(MJ-2014-D-19)
作者单位
吴英龙 School of Aeronautics and Astronautics,Zhejiang University,Hangzhou 310027,China
High-speed Rotating Machinery Laboratory,College of Energy Engineering,Zhejiang University,Hangzhou 310027,China
 
宣海军 High-speed Rotating Machinery Laboratory,College of Energy Engineering,Zhejiang University,Hangzhou 310027,China 
单晓明 .Hunan Powerplant Research Institute,Aero Engine Corporation of China,Zhuzhou Hunan 412002,China 
摘要点击次数: 110
全文下载次数: 107
中文摘要:
      为进行某轮损伤容限设计,开展了裂纹扩展断口分析和仿真分析研究。由断口分析可知:疲劳源为一处内部自然缺陷;依据疲劳辉纹确定了裂纹扩展速率;在裂纹长度为2 mm附近,裂纹扩展速率明显增大,为第一、第二加载阶段转换区域;裂纹稳定扩展区裂纹长度与裂纹扩展速率呈双对数线性关系;应用列表梯度法和Paris公式法反推了第二加载阶段的疲劳寿命,与该阶段实际循环次数的最大误差是163%。裂纹稳定扩展阶段裂纹扩展仿真值与断口反推值吻合;非稳定扩展阶段仿真值与断口反推值的最大误差为-215%;基于以上研究,合理确定了某离心轮内部裂纹表面扩展停机检测周期。该类轮非稳定、失稳扩展阶段寿命占内部裂纹表面扩展阶段寿命的比例达248%~357%,因此准确计算具有重要意义。
英文摘要:
      In order to carry out the damage tolerance design of wheel, the crack propagation characteristics were studied by fractographic restrostimation and crack propagation simulation analysis. The crack growth rate was determined according to the fatigue striation. Close to crack length of 2 mm, the crack growth rate increased significantly, acting as the transition region of the first and second loading stages; in the stable crack growth zone, crack length had a bilinear logarithmic relationship with the crack growth rate; the list gradient method and Paris formula method were used to reversely calculate the fatigue life, and the fatigue life was 163% higher than the cycles of the second loading stage. The simulated values of crack growth in the stable stage of crack propagation coincided with the values of fracture inversion, but the simulated values in the unstable stage were less than the values of fracture inversion, and the error was -215%. Based on the above research, a reasonable table for a centrifugal wheel was determined. The life of wheels in unstable stage accounted for 248%-357% of the life of internal crack surface growth stage, so accurate calculation was of great significance.
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