采油单螺杆泵动态力学特性及疲劳寿命预测研究OA北大核心CSTPCD

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 ma-terial 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 condi-tions was studied by using the established fatigue life prediction model.The results show that the fa-tigue life decreases exponentially with the increase of interference.Compared with the average work-ing life of a single PCP in recent 5 years,based on crack propagation method the fatigue life of the sta-tor rubber may meet the requirements of engineering prediction accuracy.