钻杆的疲劳寿命计算

Computation of Drill Rods Fatigue Life

摘要:

采用断裂力学理论，对表面半椭圆、表面线性、深埋椭圆以及深埋圆形等４种裂纹钻杆的临界裂纹尺寸和疲劳寿命进行计算，并通过实例说明严格检验钻杆和减小弯曲应力对提高钻杆使用寿命的重要性。

Abstract:

Critical fissure dimensiorns and fatigue life of semi-ellipse surface, surface, linearity, deep ellipse and deep circle cracked drill rod, etc. can be computed on the base of theories of fracture mechanics, and the impor-tance for extensing the life of rod by strictly inspection to diminish bending stress is demonstrated through instances.