石油钻采工艺2017，Vol.39Issue(3)：334-337,4.DOI:10.13639/j.odpt.2017.03.015
超高强度抽油杆P-S-N曲线拟合新方法
A new fitting method for P-S-N curve of ultra-high-strength sucker rod
摘要
Abstract
P-S-N curve is one important basis for analyzing the mechanical performance of ultra-high-strength sucker rod, and its fitting method is generally referred to that of conventional sucker rods. Based on experimental data, however, ultra-high-strength sucker rod can't satisfy the assumptions of P-S-N curve fitting model which is used for conventional sucker rods. A three-parameter P-S-N curve fitting model based on Box-Cox variable transformation method was developed to search for a fitting method suitable for the P-S-N curve of ultra-high-strength sucker rod. By means of Box-Cox variable transformation method, fatigue life can satisfy normal distribution in a certain cyclic stress. The three-parameter P-S-N curve model is more accordant with the trend of typical S-N curve. It is indicated from experimental calculation results that by virtue of this new method, the fitting degree of P-S-N curve is higher with relative error only 1.46%-4.12%, which is just 11%-30% of the conventional value. The fitting based on this new method can embody the mechanical performance of ultra-high-strength sucker rod more accurately.关键词
P-S-N曲线/超高强度/抽油杆/Box-Cox变量变换法Key words
P-S-N curve/ultra high strength/sucker rod/Box-Cox variable transformation method分类
能源科技引用本文复制引用
胥元刚,郝帆帆..超高强度抽油杆P-S-N曲线拟合新方法[J].石油钻采工艺,2017,39(3):334-337,4.基金项目
西安石油大学研究生创新基金项目(编号:2015cx140104) （编号:2015cx140104）
西安石油大学优秀硕士学位论文培育项目(编号:2015yp140104). （编号:2015yp140104）
