螺杆泵定子橡胶疲劳裂纹扩展寿命预测
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摘要
对非线性弹性断裂能量释放率和裂纹扩展速度的关系进行研究,建立了橡胶材料的疲劳裂纹扩展寿命预测模型.对带有预制切口的橡胶试件进行疲劳试验,试验疲劳寿命与理论预测疲劳寿命误差值为8.72%,验证此法预测螺杆泵定子橡胶的裂纹扩展寿命是可行的.对螺杆泵进行有限元计算和力学分析,确定螺杆泵最大等效应力和最小等效应力,进而计算螺杆泵各段模型危险疲劳位置的应变能释放率范围,预测螺杆泵定子橡胶的疲劳扩展寿命,并与螺杆泵实际寿命基本吻合,为螺杆泵疲劳寿命的预测研究提供了具有一定实用性的理论及方法.
Research on the relationship between nonlinear elastic fracture energy release rate and crack growth rate,the rubber material prediction model of the fatigue crack extension life is established.A fatigue test is carried out for rubber specimen with prefabricated notch,the error of measured and estimated fatigue life is 8.72%,the error value is in a reasonable range,so it is feasible to predict the fatigue crack growth life for stator rubber of progressing cavity pump(PCP).Determining the maximum and minimum equivalent stress based on the finite element calculation and force analysis of PCP,to calculate the range of strain energy release rate in each dangerous position of PCP,predicting the fatigue crack growth life for stator rubber of PCP which is basically consistent with the actual life of PCP,therefore,it provides a practical theory and method for the prediction of the fatigue life of PCP.
Research on the relationship between nonlinear elastic fracture energy release rate and crack growth rate,the rubber material prediction model of the fatigue crack extension life is established.A fatigue test is carried out for rubber specimen with prefabricated notch,the error of measured and estimated fatigue life is 8.72%,the error value is in a reasonable range,so it is feasible to predict the fatigue crack growth life for stator rubber of progressing cavity pump(PCP).Determining the maximum and minimum equivalent stress based on the finite element calculation and force analysis of PCP,to calculate the range of strain energy release rate in each dangerous position of PCP,predicting the fatigue crack growth life for stator rubber of PCP which is basically consistent with the actual life of PCP,therefore,it provides a practical theory and method for the prediction of the fatigue life of PCP.
引文
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[2]GREENSMITH H W.The change in stored energy on making a small cut in a test piece held in simple extension[J].Appl Polym Sci,1963,7(3):993-1002.
[3]LAKE G J.Application of fracture mechanics to failure in rubber articles,with particular reference to groove cracking in tires[C]∥Conference Yield Deformation and Fracture of Polymers,Physics Institute,London.1970.
[4]LUO R K,COOK P W,WU W X,et al.An approach to evaluate the service life of rubber springs used in rail vehicle suspensions[J].Proc Instn Mech Engrs Part F:Rail and Rapid Transit,2004,218:173-177.
[5]LUO R K,WU W X.Fatigue failure analysis of anti-vibration rubber spring[J].Engineering Failure Analysis,2006,13:110-116.
[6]韩佳轩.螺杆泵定子橡胶的疲劳寿命研究[D].大庆:东北石油大学,2013.HAN J X.Research on fatigue life of screw pump stator rubber[D].Daqing:Northeast Petroleum University,2013.
[7]丁智平,陈吉平,宋传江,等.橡胶弹性减振元件疲劳裂纹扩展寿命分析[J].机械工程学报,2010,46(22):58-64.DING Z P,CHEN J P,SONG C J.Analysis of fatigue crack growth life for rubber vibration damper[J].Chinese Journal of Mechanical Engineering,2010,46(22):58-64.
[8]王伟晓.橡胶弹性减振元件疲劳寿命预测研究[D].株洲:湖南工业大学,2009.WANG W X.Study on fatigue life prediction of rubber elastic absorber[D].Zhuzhou:Hunan University of Technology,2009.