航空学报 > 1994, Vol. 15 Issue (6): 757-760

试件厚度对铝合金疲劳裂纹扩展的影响

张诗捷, 朱亦钢, 黄新跃, 刘绍伦   

  1. 北京航空材料研究所机械性能研究室,北京,100095
  • 收稿日期:1993-03-16 修回日期:1993-06-14 出版日期:1994-06-25 发布日期:1994-06-25

THICKNESS EFFECT ON FATIGUE CRACK PROPAGATION OF AI-ALLOY

Zhang Shijie, Zhu Yigang, Huang Xinyue, Liu Shaolun   

  1. Mechanical properties department,Institute of Aeronautical Materials,Beijing,100095
  • Received:1993-03-16 Revised:1993-06-14 Online:1994-06-25 Published:1994-06-25

摘要: 不同厚度试样的疲劳裂纹扩展试验表明,飞行模拟载荷条件下具有明显的厚度影响。考查了模型对于厚度影响的预测能力。Newman的模型具有预测厚度影响的潜力,广义改进的Willenborg模型不含有厚度影响的考虑,即使通过调整约束系数α的方法也难于计及厚度的影响。

关键词: 铝合金, 裂纹扩展, 尺寸稳定性

Abstract: atigue crack growth tests were conducted in 7475-T7351 Al alloy with specimens of different thicknesses From flight simulation loading tests a significant thickness effect was ob-served. Crack growth life prediction was carried out using some famous models.It was found that Newman’s model has the capability to predict thickness effect,while the generalized modified Willenborg model is not able to consider thickness effect evenby adjusting constraint coefficient.The physical reason of thickness effect and the modeling consideration are two of the important subjects for successful crack analysis.

Key words: aluminum alloys, crack propagation, dimensional stability

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