| 顾铖璋.深冷环境下密封橡胶的力学性能研究[J].橡胶科技,2021,19(8):0375-0381. |
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| 深冷环境下密封橡胶的力学性能研究 |
| Mechanical Performance of Sealing Rubber under Cryogenic Environment |
| 投稿时间：2021-04-15 修订日期：2021-04-15 |
| DOI：10.12137/j.issn.2095-5448.2021.08.0375 |
| 中文关键词: 密封 橡胶 深冷环境 超弹性本构模型 |
| 英文关键词: sealing rubber cryogenic environment hyper-elastic constitutive model |
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| 中文摘要: |
| 在深冷环境下密封橡胶材料易发生变脆、高弹性丧失等现象，从而导致密封性能降低。密封橡胶的力学性能是评估密封可靠性的重要参数。选择低苯基硅橡胶及以低苯基硅橡胶为基体分别添加全氟聚醚油和聚酰亚胺粉的改性橡胶为研究对象，考察3种橡胶在超低温下的力学性能，在常温（23 ℃）和超低温（－196 ℃）下进行单轴拉伸和压缩永久变形试验，并利用有限元软件Abaqus超弹性材料拟合板块对本构模型进行参数模拟，探讨Mooney-Rivlin模型、Ogden模型和Yeoh模型对超低温下密封橡胶的适用性。结果表明：在超低温下，聚酰亚胺粉改性低苯基硅橡胶的密封性能优于其他两种橡胶材料；在单轴拉伸试验拟合中，Yeoh模型拟合误差较小；在压缩试验拟合中，Mooney-Rivlin模型和Ogden模型能更准确地描述橡胶力学性能。 |
| 英文摘要: |
| Sealing rubber working under the cryogenic environment undergoes brittle ductile transition and loss of high elasticity，leading to a decrease in sealing performance. Mechanical properties are required in the evaluation of the sealing performance of sealing rubber. In this paper，low phenyl silicone rubber and the modified low phenyl silicone rubbers with perfluoropolyether oil and polyimide powder were selected as the research objects，and the mechanical properties of the rubber compounds at ultra-low temperature were investigated. The uniaxial tensile and compression permanent deformation tests were carried out at room temperature（23 ℃） and ultra-low temperature（-196 ℃）. Then，the parameters of the constitutive models of the materials were obtained by simulation using the hyper-elastic material fitting module of the finite element software Abaqus. The applicability of Mooney Rivlin model，Ogden model and Yeoh model to the sealing rubber at ultra-low temperature was discussed. The results showed that，under ultra-low temperature，the low phenyl silicone rubber modified by polyimide powder maintained the superior sealing performance in comparison with the other two rubber materials. The fitting error of Yeoh model was smaller in the fitting of uniaxial tension test，while Mooney-Rivlin model and Ogden model could predict the mechanical behavior in compression permanent deformation test more accurately. |
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