【摘要】 抽油杆主要失效形式是疲劳断裂,因此,必须对抽油杆的结构形状进行研究。作者用光弹性试验,对JB2823-79和API两种规范的7/8＂抽油杆进行了对比,通过两种结构形式的7/8＂抽油杆模拟试验,分析了杆头锻造部分的表面应力分布情况;对5/8＂、3/4＂、7/8＂、1＂和9/8＂五种抽油杆进行了平面光弹试验,分析了扳手方附近的过渡圆角的大小对该部位应力分布的影响;最后又通过四种不同卸荷槽长度的模型试验,分析了卸荷槽长度对公螺纹各牙受载情况的影响。更多还原

【Abstract】 It is known that fatiguefracture is the main form of failure occurring to a sucker rod. It is necessary to conduct an investigation on the shape in designing a sucker rod. The author performed several experiments. Firstly, by means of photoelastic experiment, he made a comparison between both 7/8" sucker rods of JB2823-79 and API Specification. Secondly, the author analysed the surface stress distribution state at the upper forged portions of two 7/8" sucker rods in different structural forms through simulated tests. Thirdly, by means of plane photoelastic experiments on sucker rods in five sizes (5/8", 3/4", 7/8",1" and 1(1/8)") , he analysed the effect of transition fillets near the torque force of the wrench exerted upon the stress distribution of this position. Lastly,through four model tests for different lengths of unloading grooves, the effect of unloading groove length exerted on each ridge of male threads under loaded condition was also analysed.更多还原