抽油杆螺纹连接最佳预紧力的试验方法  

Experiment Research Method for the Best Prestress in Thread Connection of Sucker Rod

作　　者：李国义[1,2,3,4] 李其[1,2,3,4] 李金民 李国喜[1,2,3,4] 蔺伯平 

机构地区：[1]大庆石油学院石油机械系 [2]大庆石油管理局总机械厂 [3]大庆石油管理局电泵公司 [4]大庆石油管理局采油三厂

出　　处：《大庆石油学院学报》1998年第2期51-54,共4页Journal of Daqing Petroleum Institute

基　　金：国家"八五"攻关项目

摘　　要：采用断裂力学方法和已知应力强度因子的标准试件，测定出待测试件的裂纹扩展速率和应力强度因子，用数学回归分析方法测定出Ｐａｒｉｓ公式中的材料系数，采用工程实际构件，通过试验得出了裂纹扩展速率随裂纹深度的变化规律。利用Ｐａｒｉｓ公式求出应力强度因子幅值ΔＫ，最后求出应力强度因子因数，比较了不同预紧力情况下应力强度因子因数的大小，得到的对应最小值时的预紧力，即最佳预紧力。According to fracture mechanics method, and by means of normal samples, the stress intensity factor is determined, and extensive velocity of tap and the stress intensity factor is obtained. By mathematical regressing analysis, the material factor of Paris formula c,n is measured. By using engineering practical sample, we have measured principle of tap extensive velocity (d a )/(d N ) with top depth in an experiment, and using Paris formula to calculate the amplitude of stress intensity factor Δ K , we derive the non dimensionous stress intensity factor, comparing the value of non dimensionous stress intensity factor in different prestress value, the prestress corresponding to the smallest value is the best prestress.

关 键 词：抽油杆 螺纹连接 预紧力 试验 

分 类 号：TE933.2[石油与天然气工程—石油机械设备]