东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2012, Vol. 33 ›› Issue (11): 1611-1615.DOI: -

• 论著 • 上一篇    下一篇

抽油杆表面裂纹扩展寿命可靠性分析

李鹤;马铭蔚;陶婷;闻邦椿;   

  1. 东北大学机械工程与自动化学院;上海航天科工电器研究院有限公司;
  • 收稿日期:2013-06-19 修回日期:2013-06-19 发布日期:2013-01-25
  • 通讯作者: -
  • 作者简介:-
  • 基金资助:
    教育部新世纪优秀人才支持计划项目(NCET-10-0271);;

Reliability analysis of propagation lives of sucker rod's surface crack

Li, He (1); Ma, Ming-Wei (1); Tao, Ting (2); Wen, Bang-Chun (1)   

  1. (1) School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China; (2) Shanghai Institute of Aerospace Science and Industry Electrical Co., Ltd., Shanghai 200333, China
  • Received:2013-06-19 Revised:2013-06-19 Published:2013-01-25
  • Contact: Li, H.
  • About author:-
  • Supported by:
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摘要： 在拉伸载荷的作用下,以Paris公式为基础,考虑几何修正系数f与裂纹尺寸a的内在关系,结合分段数值积分方法计算抽油杆裂纹扩展寿命,并应用Monte Carlo法计算不同类型表面裂纹扩展寿命可靠度.计算结果表明,在其他条件相同情况下,把裂纹处理为受深度比、纵横比两个参数控制的椭圆裂纹比仅受深度比控制的圆弧裂纹和直裂纹适应性更强;带有环形裂纹的抽油杆最先断裂;断裂力学中将各个参数作为确定值计算得到的临界裂纹扩展寿命不够准确,可能导致部分抽油杆还未达到临界裂纹扩展寿命就发生断裂.

关键词: 抽油杆, Paris公式, 裂纹扩展寿命, MonteCarlo法, 可靠性

Abstract: The crack propagation life was calculated under the tensile load using the sectional type numerical integration method based on the Paris formula considering the relation of geometric modified index f and crack size a. The Monte Carlo method was also used to get the reliability of different types of surface crack propagation lives. The results showed that taking the defect as an elliptical crack governed by depth ration and aspect ratio is better than circular arc crack or straight-edged crack only governed by depth ration. The sucker rods with the circular crack break first. The critical crack propagation life based on the traditional fracture mechanics is not accurate, and the sucker rod may break before the critical crack propagation lives.

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