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鉴于抽油杆杆头螺纹段常产生疲劳破坏，用Ｊａｍｅｓ－Ａｎｄｅｒｓｏｎ方法研究了有预紧力的螺纹段存在表面裂纹缺陷时的应力强度因子，重点讨论了预紧力的影响，采用了预紧力分别为５４，４４，３４ｋＮ的１．５９ｃｍ抽油杆螺纹段试件，用降载勾线技术，动态监测信号，成功地解决了在试件断口上疲劳裂纹扩展过程的留印问题，取得了可靠的大量试验数据，经过数据处理和分析，得到了３种预紧力时的应力强度因子表达式，提出了４４ｋＮ为１．５９ｃｍ抽油杆的最佳预紧力。
In view of the fatigue damage often occurs in the threaded section of the sucker rod head, the stress intensity factor when there is a surface crack defect in the pre-stressed thread section is studied by James-Anderson method. The pre-tightening force is mainly discussed. Force of 54,44,34 kN respectively 1.59cm sucker rod thread section specimens, with the load line technology, dynamic monitoring signal, the successful solution to the specimen fracture fatigue crack growth process of the issue of the print, obtained A large number of reliable experimental data were obtained. After the data processing and analysis, three kinds of stress intensity factor expressions were obtained when the preload was applied. The optimal preload of the 1.59cm sucker rod with 44kN was proposed.