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利用按有限元法得到的抽油杆平面模型、轴对称模型及三维光弹性试验结果，比较了仅因缺陷模型不同带来的差异，提出并建立了“模型比系数”，在三种缺陷模型值中进行抛物线插值，最后得到了杆体、杆体过渡段上不同周向长度（缺陷最深点周向连线长度）与纵向截面内不同轴向长度和径向深度的近半椭圆形状的三维凹坑的应力集中系数近似表达式，利用该表达式求得抽油杆在不同应力水平下的不同形状凹坑、凹槽缺陷的容限。提出了有缺陷杆的修复判废条件和使用应力的确定方法。
Using the plane model, the axisymmetric model and the three-dimensional photoelasticity test of the sucker rod obtained by the finite element method, the differences caused by different defect models were compared and the “model ratio coefficient” was proposed and established. In the three defect models Value of parabola interpolation. Finally, the stress of the three-dimensional pits with nearly semi-elliptical shape with different axial length and radial depth in the longitudinal section of the rod body and the rod body at the different circumferential lengths The approximate expression of the concentration coefficient is used to obtain the allowable tolerances of different shaped pits and grooves in the sucker rod under different stress levels. Proposed a defective rod repair sentenced to waste conditions and the use of stress determination.