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| 激光冲击强化对外物损伤叶片前缘的疲劳强度影响研究 |
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陆炜鑫1，胡殿印1,2,3，鄢林4，毛建兴1,2,3，郭小军3,5，单晓明3,5，张永康6，王荣桥2,3,4
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1.北京航空航天大学 航空发动机研究院，北京 100191;2.北京航空航天大学 航空发动机结构强度北京市重点实验室，北京 100191;3.中小型航空发动机联合研究中心，北京 100191;4.北京航空航天大学 能源与动力工程学院，北京 100191;5.中国航发湖南动力机械研究所，湖南 株洲 412002;6.广东工业大学 机电工程学院，广东 广州 510006
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| 摘要: |
| 为研究激光冲击强化对某型离心叶轮外物损伤后疲劳强度的影响，设计了反映真实叶片前缘部位的特征模拟件，并结合空气炮法模拟外物损伤，对比有/无激光冲击强化模拟件的高周疲劳试验结果，发现经激光冲击强化处理后，模拟件的疲劳强度提高约37%。同时，开展了激光冲击强化以及外物损伤后的残余应力/应变场数值仿真，结合Kitagawa-Takahashi（K-T）图法建立了考虑外物损伤与激光冲击强化的疲劳强度预测方法，与试验结果相比平均误差为7.3%，验证了方法的有效性。 |
| 关键词: 离心叶轮 叶片前缘 外物损伤 激光冲击强化 疲劳强度 K-T图法 |
| DOI：10.13675/j.cnki.tjjs.2301003 |
| 分类号:V232.4 |
| 基金项目:国家自然科学基金（52022007；51905020；52275142）；国家科技重大专项（J2019-IV-0009-0077）。 |
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| Effects of laser shock peening on fatigue strength of blade leading edge with foreign object damage |
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LU Weixin1, HU Dianyin1,2,3, YAN Lin4, MAO Jianxing1,2,3, GUO Xiaojun3,5, SHAN Xiaoming3,5, ZHANG Yongkang6, WANG Rongqiao2,3,4
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1.Research Institute of Areo-Engine，Beihang University，Beijing 100191，China;2.Beijing Key Laboratory of Aero-Engine Structure and Strength，Beihang University，Beijing 100191，China;3.United Research Center of Mid-Small Aero-Engine，Beijing 100191，China;4.School of Energy and Power Engineering，Beihang University，Beijing 100191，China;5.AECC Hunan Aviation Powerplant Research Institute，Zhuzhou 412002，China;6.School of Electro-Mechanical Engineering，Guangdong University of Technology，Guangzhou 510006，China
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| Abstract: |
| In order to study the effects of laser shock peening on the fatigue strength of a centrifugal impeller after foreign object damage， a characteristic simulation specimen reflecting the real leading edge of the blade was designed， combined with the air cannon method to simulate the foreign object damage. By comparing the high-cycle fatigue test results of the simulated specimens with and without laser shock peening， it is found that the fatigue strength of the simulated parts increased by about 37% after laser shock peening. At the same time， numerical simulation of residual stress/strain field after laser shock peening and foreign object damage was carried out. Combined with Kitagawa-Takahashi （K-T） diagram， a fatigue strength prediction method considering foreign object damage and laser shock peening was established. Compared with the experimental results， the average error is 7.3%， which verified the effectiveness of the method. |
| Key words: Centrifugal impeller Blade leading edge Foreign object damage Laser shock peening Fatigue strength K-T figure method |
