抽油杆螺纹段表面的裂纹形貌  

Analysis of the morphology of crack on the surface of screw-thread in sucker rod

作　　者：李国义[1] 母丽敏[2] 祖树平 梁瑞成 

机构地区：[1]大庆石油学院石油机械系,黑龙江安达151400 [2]大庆石油化工总厂实业公司,黑龙江安达163110 [3]大庆开发区物业总公司,黑龙江大庆163316

出　　处：《大庆石油学院学报》1999年第4期50-52,共3页Journal of Daqing Petroleum Institute

基　　金：国家"八五"科技攻关项目!( 0 6 2 3 )

摘　　要：为了防止抽油杆的整体失效,采用断裂力学的方法研究了螺纹段表面裂纹的扩展规律,用人工模拟不规则曲线表面初始缺陷,从试验和理论两方面研究抽油杆螺纹段表面裂纹形貌.结果表明,无论如何初始化裂纹形状,在裂纹向前扩展中,裂纹立即椭圆化,其形状是等离心率的同心椭圆.因此,不管在抽油杆螺纹段不规则曲线表面初始缺陷多么复杂,开始就可以将其处理成部分椭圆形状,从而可简化抽油杆螺纹段表面裂纹剩余寿命的计算.The extension rules of the crack on the surface of screw\|thread are studied by using the fracture mechanics in order to prevent sucker rods from being overall failure. The initial defect of the rod is simulated by man\|made irregular curves to simplify the test process. The results of test show that the crack can be taken as elliptic form partially to simplify the calculation of remaining working life of the screw\|thread.

关 键 词：抽油杆 裂纹形貌 断裂力学 螺纹段 

分 类 号：TE933.207[石油与天然气工程—石油机械设备] TE933.201