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力学与实践 ›› 2004, Vol. 26 ›› Issue (3): 0-0.doi: 10.6052/1000-0992-2003-075

• 应用研究 •    

焊接金属疲劳裂纹萌生寿命估算方法的研究

杨化仁   

  1. 沈阳大学216信箱 110044
  • 收稿日期:2003-03-05 修回日期:1900-01-01 出版日期:2004-06-10 发布日期:2004-06-10

THE ESTIMATE METHOD OF FATIGUE CRACK INITIATION LIFE IN WELDED METAL

  • Received:2003-03-05 Revised:1900-01-01 Online:2004-06-10 Published:2004-06-10

摘要: 疲劳裂纹萌生阶段在整个疲劳破坏过程中占有极为重要的地位,而萌生阶段的裂纹体损伤 规律用长裂纹断裂力学方法是无法确定的. 以萌生阶段中塑性滞回能作为控制参量, 根据实验数据拟合出疲劳损伤的连续曲线,得到裂纹萌生寿命估算公式.

关键词: 疲劳裂纹, 萌生, 塑性滞回能

Abstract: Fatigue crack initiation is an important period in the whole fatigue life. The crack initiation period cannot be estimated with fracture mechanics, which is used for large cracks. In this paper, the crack initiation life estimate equation is deduced by using the fatigue damage continuous curve with the basis of experimental data obtained from the crack initiation plastic hysteresis energy as a control parameter.

Key words: fatigue crack, initiation, plastic hysteresis energy