热机械耦合条件下 O 形环的长期密封性能评估和使用寿命预测

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Ming Li, Tao Zhang, Xing Fang, Du Zhou, Guoliang Xu, Xiaoming Huang
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引用次数: 0

摘要

在使用过程中,热机械耦合条件会加剧 O 形圈的应力松弛并导致其热膨胀,从而使密封问题更加复杂。我们开发了一种有限元方法来模拟 O 形圈在热机械耦合条件下的机械变形行为,并通过与实验数据的对比验证了该方法的有效性。在大量模拟数据的基础上,研究发现无量纲接触应力可作为密封性能退化的指标,并以老化动力学方程的形式与温度 T 和时间 τ 相关联。通过将该方程与现有的界面泄漏模型相结合,提出了一种预测 O 形圈长期泄漏率的方法,以定量评估各种因素对 O 形圈性能的影响,并得出了一些重要结论。关于温度对 O 形圈的影响,当使用时间小于 20 天时,热膨胀效应占主导地位;当使用时间大于 20 天时,应力松弛效应占主导地位。温度越高,应力松弛越明显,O 形圈的泄漏率越快。增加流体压力会增强松弛效果。以最大允许泄漏率作为失效标准,绘制了代表安全边界的压力-温度曲线,可用于指导密封结构的设计。此外,对使用寿命评估的详尽研究表明,在高温(T ≥ 120 ℃)条件下,使用寿命曲线在压力升至 0.42 兆帕附近会出现一个骤降段。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Long-term sealing performance evaluation and service life prediction of O-rings under thermal-mechanical coupling conditions
In service, thermal-mechanical coupling conditions can exacerbate stress relaxation of O-rings and lead to their thermal expansion, further complicating the sealing problem. A finite element method is developed to simulate the mechanical deformation behavior of O-rings under thermal-mechanical coupling conditions, and its validity is verified by comparison with experimental data. Based on a substantial amount of simulation data, it is found that a dimensionless contact stress can be used as an indicator of the degradation of sealing performance and can be related to temperature T and time τ in the form of an aging kinetic equation. By combining this equation with the existing interfacial leakage model, an approach of predicting the long-term leakage rate of O-rings is proposed to quantitatively evaluate the effect of various factors on the performance of O-rings, and some important conclusions are drawn. Regarding the effect of temperature on O-rings, the thermal expansion effect dominates when the service time is less than 20 days, and the stress relaxation effect prevails when it is greater than 20 days. The higher the temperature, the more significant the stress relaxation, and the faster the leakage rate of O-rings. Increasing the fluid pressure enhances the relaxation effect. Using the maximum allowable leakage rate as the failure criterion, a pressure-temperature curve is plotted representing the safety boundaries, which can be used to guide the design of the sealing structures. Furthermore, an exhaustive study on the service life evaluation shows that at high temperature (T ≥ 120 ℃), the service life curves show a plunging segment near a pressure rise to 0.42 MPa.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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