本文選題：螺栓法蘭系統(tǒng) + 無石棉墊片�。� 參考：《昆明理工大學(xué)》2014年碩士論文

【摘要】：墊片螺栓接頭是壓力管道、壓力容器應(yīng)用最廣泛的可拆式連接。墊片作為其中的過渡元件與相鄰法蘭的結(jié)合面形成緊密的接觸,提供連接必須的密封,它的性能將直接影響整個(gè)接頭的可靠性。本文利用有限元法,在不同內(nèi)壓和溫度條件下,對(duì)整個(gè)接頭系統(tǒng)進(jìn)行了數(shù)值模擬分析。主要研究?jī)?nèi)容如下： 1.對(duì)無石棉墊片的抗拉強(qiáng)度、壓縮回彈性、耐介質(zhì)性、密封性展開了進(jìn)一步的研究。 2.根據(jù)無石棉底片具有非線性黏彈性的特點(diǎn),構(gòu)造了常溫下無石棉墊片的蠕變松弛數(shù)學(xué)模型,并用試驗(yàn)對(duì)所構(gòu)造的數(shù)學(xué)模型進(jìn)行了驗(yàn)證。結(jié)果表明本文提出的數(shù)學(xué)模型可以用來預(yù)測(cè)墊片在常溫下的行為特性。進(jìn)而,墊片應(yīng)力水平和墊片厚度對(duì)墊片常數(shù)的影響在該模型中也得到了進(jìn)一步的研究。 3.考慮了墊片材料的非線性和接觸非線性建立了墊片螺栓接頭的三維力學(xué)模型及傳熱學(xué)模型。 4.利用ABAQUS軟件對(duì)墊片螺栓接頭的溫度場(chǎng)、應(yīng)力場(chǎng)進(jìn)行了模擬研究。分析得出：a)螺栓、法蘭和墊片的溫度分布；b)法蘭轉(zhuǎn)角與螺栓、墊片的應(yīng)力關(guān)系；c)墊片周向和軸向方向上的應(yīng)力分布；d)在耦合狀態(tài)下溫度對(duì)應(yīng)力的影響等。法蘭接頭的性能主要是其強(qiáng)度和密封能力,在內(nèi)壓工況下對(duì)其性能的分析和試驗(yàn)研究已經(jīng)很成熟拉,但是隨著高溫高壓設(shè)備的普及應(yīng)用,對(duì)其接頭的性能要求就越高。目前的設(shè)計(jì)規(guī)范中并未考慮溫度對(duì)整個(gè)結(jié)構(gòu)強(qiáng)度和密封能力的影響,本文對(duì)高溫高壓下螺栓法蘭接頭的強(qiáng)度和密封能力進(jìn)行了研究,以此來確定其安全操作條件或接頭的載荷能力。所得出的規(guī)律對(duì)于墊片螺栓接頭的強(qiáng)度和密封能力設(shè)計(jì)具有一定的指導(dǎo)意義。
[Abstract]:Gasket bolt joint is a pressure pipe, pressure vessel is the most widely used detachable connection. The gasket acts as the transition element and forms close contact with the joint surface of the adjacent flange, which provides the necessary sealing for the connection, and its performance will directly affect the reliability of the whole joint. In this paper, the finite element method is used to simulate the whole joint system under different internal pressure and temperature. The main contents are as follows: 1. In this paper, the tensile strength, compression resilience, medium resistance and sealing property of stone free cotton pad are further studied. 2. According to the nonlinear viscoelastic characteristics of asbestos-free negatives, a creep relaxation mathematical model of asbestos-free cotton pads was constructed at room temperature, and the mathematical model was verified by experiments. The results show that the proposed mathematical model can be used to predict the behavior of gasket at room temperature. Furthermore, the effects of gasket stress level and gasket thickness on the gasket constant are further studied in this model. Considering the nonlinear and contact nonlinearity of gasket material, the three-dimensional mechanical model and heat transfer model of gasket bolt joint are established. 4. The temperature field and stress field of gasket bolt joint were simulated by Abaqus software. The temperature distribution of the bolt, flange and gasket is analyzed. The relationship between the angle of flange and the bolt, the stress relation of the gasket, the stress distribution in the circumferential and axial direction of the gasket is obtained, and the effect of temperature on the stress under the coupling state is obtained. The performance of flange joint is mainly its strength and sealing ability. The analysis and experimental study on the performance of flange joint under internal pressure condition is very mature. However, with the popularization and application of high temperature and high pressure equipment, the higher the performance requirement of the joint is. The influence of temperature on the strength and sealing ability of the bolted flange joint is not considered in the current design code, and the strength and sealing ability of the bolt flange joint under high temperature and high pressure are studied in this paper. In order to determine its safe operating conditions or joint load capacity. The obtained rule has certain guiding significance for the design of strength and sealing ability of gasket bolt joint.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TH131

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