中国机械工程

• 机械基础工程 • 上一篇    下一篇

环境湿度对铸铝合金超声疲劳裂纹扩展速率的影响研究

李文凯1;崔海涛1;温卫东1;苏旭明2;C C Engler-Pinto Jr2   

  1. 1.南京航空航天大学江苏省航空动力系统重点实验室,南京,210016
    2.北美福特汽车研究与创新中心,迪尔伯恩,密歇根州,美国,48121
  • 出版日期:2016-09-10 发布日期:2016-09-18

Effects of Humidity on Ultrasonic Fatigue Crack Growth Rate  of a Cast Aluminum Alloy

Li Wenkai1;Cui Haitao1;Wen Weidong1;Su Xuming2;C C Engler-Pinto Jr2   

  1. 1.Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing,210016
    2. Research and Innovation Center, Dearborn, MI, American,48121
  • Online:2016-09-10 Published:2016-09-18

摘要: 针对铸铝合金A356-T6开展了不同环境湿度下的超声疲劳裂纹扩展试验和实验室环境湿度下的常规疲劳裂纹扩展试验。由试验结果可知,超声疲劳在干空气环境中的疲劳裂纹扩展速率最低,而在蒸馏水环境中的疲劳裂纹扩展速率最高。常规疲劳在实验室环境中的疲劳裂纹扩展速率和超声疲劳在蒸馏水环境中的疲劳裂纹扩展速率几乎一致。针对Wei建立的环境湿度对铝合金材料疲劳裂纹扩展速率预测模型进行了修正,得到了铸铝合金A356-T6在任意环境湿度和试验频率下的疲劳裂纹扩展速率预测模型。

关键词: 铸铝合金, 超声疲劳, 裂纹扩展, 环境湿度

Abstract: Several fatigue crack growth tests on a cast aluminum alloy (A356-T6) were performed herein under different frequencies and humidity levels. The experimented results show that ultrasonic fatigue in dry air and in distilled water have lowest and highest crack growth rate respectively. Conventional fatigue in lab air has almost same crack growth rate as ultrasonic fatigue in distilled water. Wei's fatigue crack growth rate prediction model was modified, which could be used to predict the fatigue crack growth rate for peak aged cast aluminum alloy under different frequencies and humidity levels.

Key words: cast aluminum alloy, ultrasonic fatigue, crack growth, environmental humidity

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