航空学报 > 2021, Vol. 42 Issue (9): 224482-224482   doi: 10.7527/S1000-6893.2020.24482

新型铝锂合金AA2198高频疲劳红外热耗散演化规律

许罗鹏1,2,3,4,5, 胡石6, 刘青松1,3, 王清远2,7   

  1. 1. 中国民用航空飞行学院 理学院, 广汉 618307;
    2. 四川大学 破坏力学与工程防灾减灾四川省重点实验室, 成都 610065;
    3. 中国民用航空飞行学院 民航光子与光学探测重点实验室, 广汉 618307;
    4. 四川大学 高分子研究所 高分子材料工程国家重点实验室, 成都 610065;
    5. 浙江冠林机械有限公司, 安吉 313310;
    6. 中国民用航空飞行学院 民航安全工程学院, 广汉 618307;
    7. 成都大学 机械工程学院, 成都 610106
  • 收稿日期:2020-07-02 修回日期:2020-08-26 发布日期:2020-10-16
  • 通讯作者: 许罗鹏 E-mail:xulp@cafuc.edu.cn
  • 基金资助:
    四川大学破坏力学与工程防灾减灾四川省重点实验室2020年开放课题基金(2020FMSCU02);中国民用航空飞行学院科研基金(J2020-060,JG2019-19-02,J2020-057);大学生创新训练项目(S201910624213);四川省教育厅资助项目(16ZB0034);国家自然科学基金(U1433127)

High-frequency fatigue infrared heat dissipation of new Al-Li alloy AA2198

XU Luopeng1,2,3,4,5, HU Shi6, LIU Qingsong1,3, WANG Qingyuan2,7   

  1. 1. School of Science, Civil Aviation Flight University of China, Guanghan 618307, China;
    2. Failure Mechanics&Engineering Disaster Prevention and Mitigation, Key Laboratory of Sichuan Province, Sichuan University, Chengdu 610065, China;
    3. Key Laboratory of Photonic and Optical Detection in Civil Aviation, Civil Aviation Flight University of China, Guanghan 618307, China;
    4. Polymer Research Institute, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China;
    5. Zhejiang Guanlin Machinery Inc., Anji 313310, China;
    6. College of Civil Aviation Safety Engineering, Guanghan 618307, China;
    7. School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
  • Received:2020-07-02 Revised:2020-08-26 Published:2020-10-16
  • Supported by:
    Sichuan University Failure Mechanics & Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province Open Foundation (2020FMSCU02); CAFUC Foundation (J2020-060, JG2019-19-02, J2020-057); Undergraduate Training Programs for Innovation and Entrepreneurship (S201910624213); Natural Science Foundation of Sichuan Province (16ZB0034); National Natural Science Foundation of China (U1433127)

摘要: 利用红外成像技术开展新型铝锂合金AA2198高频疲劳(100 Hz)热耗散演化规律研究,发现不同应力条件下疲劳热耗散呈现上下波动特征,试件平均温度随着加载应力的提升有增加的趋势,但升温现象并不明显,不同应力条件下温度变化幅值小于1℃。疲劳试验初期和疲劳断裂时伴随着急剧升温过程,提出的能量转化理论模型合理解释了疲劳热耗散演化过程。研究还发现,喷丸强化在试件表面形成的残余压应力有助于激发疲劳裂纹的闭合效应,对试件的升温过程具有抑制作用。

关键词: 新型铝锂合金, 红外成像技术, 高频疲劳, 热耗散, 喷丸强化

Abstract: An infrared imaging technology is used to study the rule of fatigue heat dissipation evolution of a new Al-Li alloy AA2198 under a high-frequency fatigue test condition of 100 Hz. It is found that fatigue heat dissipation on specimens shows fluctuation characteristics under different stress conditions, with its average temperature inclined to increase with the rise of the loading stresses. However, the temperature rise on specimens during fatigue test is not obvious, and the amplitudes of temperature variation under different stress condition is generally smaller than 1℃. The beginning of fatigue test and the moment of fatigue fracture occurrence are accompanied by a rapid temperature rise. An energy conversion theory model is proposed to explain the evolution process of fatigue heat dissipation. Meanwhile, the residual compressive stress formed on specimen subsurface during the shot peening process helps to intensify the fatigue crack closure, inhibiting the temperature rise on specimens.

Key words: new Al-Li alloy, infrared imaging technology, high-frequency fatigue test, infrared heat dissipation, shot peening

中图分类号: