抽油杆疲劳裂纹形状比变化规律

THE SHAPE RATIO OF FATIGUE CRACKS ON SUCKER ROD

  • 摘要: 采用断裂力学方法研究了抽油杆杆体疲劳裂纹形状比在扩展过程中的变化规律,证明无论初始形状如何,抽油杆杆体疲劳裂纹形状比在扩展过程中趋于同一个稳定数值. 通过裂纹扩展实验对直径为15.9mm的抽油杆疲劳裂纹形状比进行了实验测定,发现其裂纹形状比迅速靠近0.78.

     

    Abstract: The relation between shape ratio and depth of fatiguecrack on sucker rod is studied using fracture mechanics. The results show that theshape ratio of fatigue cracks with different depth will develop toward astable value approximatively for whatever initial shape. The crackextension test is carried out to determine the asymptotic shape ratio of thefatigue crack, and specimens made of 20CrMo with circular section are used.A linear fitting line is obtained from the experimental data and the shape ratio offatigue crack on sucker rod with diameter of 15.9\,mm is determined to be0.78.

     

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