【摘要】 抽油杆的失效与接头连接预紧力有密切关系。文章简述了影响预紧力的各种因素,通过试验表明,周向位移与预紧力关系同试样径向尺寸有关,与材料强度无关。文章在分析试验数据的基础上,给出了预紧力的选取公式,作者认为按公式取值,可保证足够的预紧力。更多还原

【Abstract】 The failure of sucker rods is closely related to a preload stress level of connection of couplings of sucker rods. This paper comprehensively presents that there are many inherent variables which affect joint makeup. Test data show that the relationship between circumferential displacement and preload stress is associated with the circumferential size of the test pieceand independent of material strength. based on analyzing test data,a selected calculation formula has been given in this paper. The authors believe that calculation with this formula will result in a sufficient preload stress level assured.更多还原