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| Study on the constitutive model of the screw motor's stator rubber based on thermal aging experiment |
| Received:July 01, 2016 Revised:September 22, 2016 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201704010 |
| KeyWord:screw drill experiment thermal aging M-R model numerical analysis |
| Author | Institution |
| 祝效华 |
西南石油大学 机电工程学院, 成都 |
| 王鹏飞 |
西南石油大学 机电工程学院, 成都 |
| 石昌帅 |
西南石油大学 机电工程学院, 成都 |
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| Abstract: |
| With the exploration and development of the oil and gas resources to the deep formation in China,high temperature-induced thermal aging problem of the screw drill's stator rubber in the underground becomes increasingly prominent.This causes serious deterioration of the screw drill's output performance and seriously affects drilling efficiency.It is urgent to know the influence of thermal aging on the mechanical properties of the screw drill's stator rubber.We propose a comprehensive scheme that decreases the decline of the screw drill's output properties at the beginning of the design stage.This paper carried out thermal aging experiments of screw motor's stator rubber at different temperatures,derived stress-strain data for tensile tests and fitted the Mooney-Rivlin model and Yeoh model. Then the test data and the model constants are analyzed.At last numerical calculations are performed by using the models.Calculation results show that:With increasing temperature,the screw drill's stator rubber is in a state of continuous hardening,and the average hardening rate at moderate and high temperatures (90℃~120℃) is 116% higher than the average hardening rate at low temperatures (30℃~90℃); for Mooney-Rivlin model, constants C1 increases and C2 decreases. C1 and C2 have an obviously opposite trend;Yeoh model constants C10 and C20 increase,but C30 decreases.Through the comparison between calculation results of the model and the indoor experimental results,we proved that Mooney-Rivlin model is more suitable for the screw motor's stator rubber than the Yeoh model.Consideration of thermal aging at ambient temperature or omission makes a great difference in the calculation results of screw drill's stator bushing.This research work not only proves that the thermal aging research of screw drill's stator rubber not only is necessary,but also provides reference for the design of screw drill's stator rubber and the selection of interference magnitude. |
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