發(fā)布時間：2018-07-23 14:24

【摘要】：金屬與金屬接觸型(MMC型)和浮動型(FLT型)螺栓法蘭連接作為兩種典型的接頭形式廣泛地應(yīng)用于核電、石油化工行業(yè)中。螺栓法蘭連接受力復(fù)雜,尤其受到附加載荷時更加容易引起泄漏。目前工程中,考慮外載荷下的螺栓法蘭接頭設(shè)計方法多數(shù)采用當(dāng)量壓力法或當(dāng)量軸力法,但這兩種方法都過于的保守。因此,分析外載荷下螺栓法蘭接頭的結(jié)構(gòu)強(qiáng)度與緊密性變得尤為重要。為了明晰外載荷對螺栓法蘭接頭應(yīng)力分布與緊密性的影響,本文通過有限元和實驗相結(jié)合的方式,在進(jìn)行墊片常溫下的壓縮回彈與泄漏率測試的實驗基礎(chǔ)上,搭建并試驗了 MMC型和FLT型接頭在外彎矩下的力學(xué)性能。利用實驗的結(jié)果對有限元分析結(jié)果進(jìn)行了驗證,并對外彎矩下兩種類型接頭的強(qiáng)度與密封性進(jìn)行了定量評定。最后考慮到現(xiàn)行標(biāo)準(zhǔn)中缺乏對MMC石墨墊片尺寸的規(guī)定,故分析了三個內(nèi)嵌有不同尺寸的MMC石墨墊片的法蘭連接在外彎矩下的力學(xué)與密封性能,明晰了石墨密封環(huán)尺寸變化對法蘭接頭抵抗外彎矩能力的影響。本文的研究對需要考慮外彎矩下的法蘭連接設(shè)計具有一定的指導(dǎo)意義。同時分析不同尺寸MMC石墨墊片的法蘭連接在外載荷下的強(qiáng)度與密封性對墊片廠商確定MMC墊片的尺寸具有一定的指導(dǎo)意義。
[Abstract]:Metal to metal contact type (MMC type) and floating type (FLT type) bolt flange connection are widely used in nuclear power and petrochemical industry as two typical joint forms. Bolt flange connection is complicated by force, especially when it is subjected to additional load, it is more likely to cause leakage. At present, the design methods of bolted flange joints under external load are mostly equivalent pressure method or equivalent axial force method, but these two methods are too conservative. Therefore, it is very important to analyze the structural strength and tightness of bolt flange joints under external load. In order to understand the effect of external load on stress distribution and tightness of bolted flange joints, the compression springback and leakage rate of gasket were tested at room temperature by the combination of finite element and experiment. The mechanical properties of MMC and FLT joints under external bending moment were built and tested. The finite element analysis results are verified by the experimental results, and the strength and sealing properties of the two types of joints under external bending moment are quantitatively evaluated. Finally, considering the lack of MMC graphite gasket dimensions in the current standard, the mechanical and sealing properties of three flanges with different sizes of MMC graphite gaskets are analyzed under the external bending moment. The influence of the size change of graphite seal ring on the resistance of flange joints to external bending moment is clarified. The research in this paper has certain guiding significance for the design of flange joints which need to consider the external bending moment. At the same time, the strength and sealing ability of flange connections with different sizes of MMC graphite gaskets under external load have a certain guiding significance for the gasket manufacturers to determine the size of MMC gaskets.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH136

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本文編號：2139689