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| Regular Pattern of the O-ring¢s Two-parameter Accelerated Degradation |
| Received:April 11, 2019 Revised:May 07, 2019 |
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| DOI：10.7643/issn.1672-9242.2019.11.016 |
| KeyWord:rubber seal accelerated degradation test reliability evaluation |
| Author | Institution |
| WANG Li |
Nanjing University of Science and Technology, Nanjing , China |
| GU Xiao-hui |
Nanjing University of Science and Technology, Nanjing , China |
| PAN Shou-hua |
Xi¢an Qinghua Co., North Special Energy Group Co.Ltd., Xi¢an , China |
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| Abstract: |
| Objective To study the regular degradation pattern of O-ring affected by temperature. Methods A constant stress accelerated degradation test was conducted at 50, 60, 70 and 80 ℃ with compression permanent deformation rate and compressive stress relaxation rate as parameters. On the basic of degraded data, the degenerate trajectory model was built, and the pseudo-failure life distribution was determined. The O-ring¢s life at 20 ℃ was predicted and its reliability was analyzed combined with the Arrhenius model. Results Theperformance degradation process of the O-ring had acceleration property. The pseudo-failure life accords with normal distribution. The estimated life of the O-ring under 0.9 reliability at 20 ℃ was 8.695 years based on compression permanent deformation, while 8.748 years based on compressive stress relaxation rate, and 8.655 year based on the two parameters. These three results were similar. Conclusion The test method and data processing method used in this paper can effectively estimate the O-ring¢s life. The result obtained when two parameters are not relevant is less than that when there is only one parameter. |
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