航空学报 > 1994, Vol. 15 Issue (3): 269-274

三维钝裂纹的边界元模拟和剩余腐蚀疲劳寿命估算方法

张永元, 阮国华   

  1. 上海交通大学工程力学系,上海,200030
  • 收稿日期:1993-02-19 修回日期:1993-07-06 出版日期:1994-03-25 发布日期:1994-03-25

BOUNDARY ELEMENT METHOD SIMULATION AND CORROSION FATIGUELIFE PREDICTION FOR 3-D BLUNT CRACKS

Zhang Yongyuan, Ruan Guohua   

  1. Department of Engineering Mechanics,Shanghai Jiaotong University,Shanghai,200030
  • Received:1993-02-19 Revised:1993-07-06 Online:1994-03-25 Published:1994-03-25

摘要: 提出了一个三维钝裂纹的计算模型,并建立了适用于这类模型的边界元法程序。还利用现有的疲劳裂纹扩展模型,对含三维钝裂纹构件的剩余疲劳寿命估算方法进行了讨论,并对三维钝裂纹在空气和海水中的扩展进行了计算。研究表明,本方法和边界元程序,既适用于三维尖裂纹的剩余寿命估算,也适用于三维钝裂纹的剩余疲劳寿命估算。

关键词: 三维钝裂纹, 应力腐蚀疲劳, 应力强度因子, 裂纹扩展速率

Abstract: A calculation model for 3-D blunt cracks in proposed and the corresponding boundary element method(BEM)computer program system is also established.The corrosion fatigue life calculation method for components with 3-D blunt crack is discussed using available model for fatigue crack growth.Calculations are for 3-D plates with surface blunt crack in air and in sea water.The results show that both the method and the BEM program proposed are val-id for both fatigue growth ofsharp cracks and fatigue growth of 3-D blunt cracks.

Key words: 3-D blunt crack, stress-corrosion fatigue, boundary element method(BEM), stress intensity factor(SIF)

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