文章信息/Info

Title:

Effect of Temperature and Preload on Creep Relaxation and Leakage Rate of Graphene Oxide Non-Asbestos Gaskets

文章編號(hào):

1674-3962(2024)03-0252-07

作者:

張靜全; 李遇賢; 郭子玉; 張杰

昆明理工大學(xué)機(jī)電工程學(xué)院，云南 昆明650500

Author(s):

ZHANG Jingquan;  LI Yuxian;  GUO Ziyu;  ZHANG Jie

School of Mechanical and Electrical Engineering, Kunming University of Technology, Kunming 650500,China

關(guān)鍵詞:

氧化石墨烯; 無(wú)石棉墊片; Burgers模型; 蠕變松弛; 泄漏率

Keywords:

graphene oxide;  non-asbestos gasket;  Burgers model;  creep relaxation; leakage rate

分類號(hào):

TB42；TB332

DOI:

10.7502/j.issn.1674-3962.202206023

文獻(xiàn)標(biāo)志碼:

A

摘要:

墊片在高溫長(zhǎng)期使用過(guò)程中發(fā)生蠕變松弛導(dǎo)致墊片應(yīng)力下降，從而影響密封效果。因此，采用理論模型預(yù)測(cè)墊片的蠕變松弛與確定墊片在高溫環(huán)境長(zhǎng)期使用過(guò)程中泄漏率的變化規(guī)律非常重要。通過(guò)實(shí)驗(yàn)測(cè)試氧化石墨烯無(wú)石棉墊片在不同溫度和不同預(yù)緊載荷下的墊片應(yīng)力值，并與根據(jù)Burgers模型計(jì)算出的墊片應(yīng)力值進(jìn)行對(duì)比。然后，通過(guò)建立泄漏率與使用時(shí)間的關(guān)系，提出氧化石墨烯無(wú)石棉墊片在不同溫度和不同預(yù)緊載荷下長(zhǎng)期使用時(shí)的泄漏率計(jì)算方法，并計(jì)算出該墊片隨時(shí)間變化的泄漏率變化規(guī)律。結(jié)果表明：墊片應(yīng)力的松弛量隨著預(yù)緊載荷的增加而增加；隨著使用時(shí)間的增加，墊片的應(yīng)力松弛變得更加平緩；當(dāng)預(yù)緊載荷相同的情況下溫度越高墊片應(yīng)力下降越明顯；Burgers模型對(duì)墊片應(yīng)力的預(yù)測(cè)值與實(shí)驗(yàn)值吻合度很好，最大誤差為4.4728%；當(dāng)溫度一定時(shí)，氧化石墨烯無(wú)石棉墊片計(jì)算的泄漏率隨著預(yù)緊載荷的增加而降低；當(dāng)預(yù)緊載荷相同時(shí)，墊片的泄漏率隨著溫度的增加而增加，且泄漏率均小于密封等級(jí)T2的泄漏率2×10-3 mg·s-1·mm-1。研究結(jié)果為氧化石墨烯無(wú)石棉墊片在高溫環(huán)境長(zhǎng)期使用過(guò)程密封性能應(yīng)用提供依據(jù)。

Abstract:

The creep relaxation of gasket during long-term use at high temperature leads to the decrease of gasket stress, which affects the sealing effect. Therefore, it is very important to use the theoretical model to predict the creep relaxation of the gasket and determine the variation law of the leakage rate of the gasket during long-term use at high temperature. The gasket stress values of graphene oxide non-asbestos gaskets at different temperatures and different preloads were tested through experiments and compared with the gasket stress values calculated by Burgers model. Then, by establishing the relationship between the leakage rate and the use time, the leakage rate calculation method for graphene oxide non-asbestos gasket under different temperatures and preloads for long-term use is proposed, and the leakage rate variation with time is calculated. The results show that the stress relaxation of gasket increases with the increase of preload. With the increase of using time, the stress relaxation of gasket becomes more gentle; when the preload load is the same, the higher the temperature, the more obvious the stress drop of the gasket; the predicted gasket stress values of Burgers model are in good agreement with the experimental values, and the maximum error is 4.4728%; when the temperature is constant, the calculated leakage rate of graphene oxide non-asbestos gasket decreases with the increase of preload; when the preload is the same, the leakage rate of gasket increases with the increase of temperature and the leakage rate is less than 2×10-3 mg·s-1·mm-1 of sealing grade T2. The results provide a basis for the sealing performance application of graphene oxide non-asbestos gasket during long-term use at high temperature.