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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。
The main failure mode of sucker rod is fatigue fracture, so the structure shape of sucker rod must be studied. The author compares the 7/8 “sucker rod with JB2823-79 and API specifications by using photoelasticity test. Through two kinds of 7/8” sucker rod simulation experiments, the author analyzes the Surface stress distribution. The planar photoelastic test was carried out on 5/8 “, 3/4”, 7/8 “, 1” and 9/8 "sucker rods. The effect of the transition fillet The size of the stress distribution of the site; and finally through the four different unloading tank length model tests, analysis of the unloading groove length on the male thread of each tooth load situation.