摘要
针对常规采油螺杆泵定子橡胶疲劳失效的问题,以油田常用的GLB120-27型单螺杆泵为研究对象,开展了50℃油浸工况下定子橡胶材料疲劳试验,获取了橡胶材料的疲劳性能参数,并构建了疲劳寿命预测模型。运用ABAQUS软件对螺杆泵进行动态力学特性有限元分析,基于数值模拟得到应力应变响应结果和定子橡胶材料单轴拉伸试验应力应变拟合表达式,计算了疲劳危险位置点应变能释放率的范围。利用构建的疲劳寿命预测模型对不同过盈量条件下的螺杆泵进行了疲劳寿命预测研究。结果表明,随着过盈量的增加,疲劳寿命呈指数函数下降,通过与某采油厂近5年单螺杆泵平均工作寿命的对比,发现基于裂纹扩展方法预测得到的螺杆泵定子橡胶疲劳寿命可以满足工程预测精度要求。
Aiming at the rubber fatigue failures of the stator of conventional production PCPs,the fatigue test of stator rubber material under 50℃oil immersion condition was carried out with GLB120-27 type single PCP as the research object,the fatigue performance parameters of rubber material were obtained,and the fatigue life prediction model was established.The dynamic mechanics characteristics of PCPs were analyzed by finite element method with ABAQUS software.Based on the stress-strain response results obtained by numerical simulation and the stress-strain fitting expression of stator rubber materials in uniaxial tensile tests,the range of strain energy release rate at fatigue danger points was calculated.The fatigue life prediction of PCPs under different interference conditions was studied by using the established fatigue life prediction model.The results show that the fatigue life decreases exponentially with the increase of interference.Compared with the average working life of a single PCP in recent 5 years,based on crack propagation method the fatigue life of the stator rubber may meet the requirements of engineering prediction accuracy.
作者
祖海英
孙金山
叶卫东
李大奇
ZU Haiying;SUN Jinshan;YE Weidong;LI Daqi(College of Mechanical Science and Engineering,Northeast Petroleum University,Daqing,Heilongjiang,163318)
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2024年第8期1358-1365,共8页
China Mechanical Engineering
基金
国家自然科学基金(52374383)。
关键词
螺杆泵
动态力学特性
定子橡胶
疲劳寿命预测
progressing cavity pump(PCP)
dynamic mechanics characteristic
stator rubber
fatigue life prediction
