本文選題：金屬軟管 + 力學(xué)行為��； 參考：《華東理工大學(xué)》2017年碩士論文

【摘要】：波紋金屬軟管是化工管路系統(tǒng)中量大面廣的補(bǔ)償元件,主要起承受內(nèi)壓,補(bǔ)償軸向位移、橫向錯(cuò)動(dòng)位移、管道熱變形,還具有隔振降噪等重要作用,是管路系統(tǒng)完整性與密封性的薄弱環(huán)節(jié),因此,其合理設(shè)計(jì)與安全運(yùn)行對(duì)石化各類裝置的安全生產(chǎn)具有重要意義。本文運(yùn)用ANSYS非線性有限元方法,對(duì)帶網(wǎng)套雙層波紋金屬軟管在工作狀態(tài)下進(jìn)行靜力學(xué)分析和熱分析。采用三維二次等參元離散波紋管,梁?jiǎn)卧x散網(wǎng)套,運(yùn)用節(jié)點(diǎn)耦合法表述波紋管與網(wǎng)套的相互作用關(guān)系,考慮彈塑性本構(gòu)關(guān)系、幾何非線性和層間接觸非線性,建立雙層波紋管和帶網(wǎng)套雙層金屬軟管的三維有限元模型。首先,得到了金屬軟管在軸向位移作用下的應(yīng)力分布規(guī)律,驗(yàn)證了網(wǎng)套對(duì)波紋管具有加強(qiáng)作用。其次,對(duì)金屬軟管施加橫向錯(cuò)動(dòng)位移載荷,得到了金屬軟管在橫向位移作用下的應(yīng)力分布規(guī)律,內(nèi)層波紋管應(yīng)力分布具有"中性層"現(xiàn)象。最后,選用同樣節(jié)點(diǎn)的熱單元離散波紋管,考慮波紋管層間死空氣層的影響,進(jìn)行了高溫運(yùn)行工況下溫度場(chǎng)分析,進(jìn)而對(duì)金屬軟管進(jìn)行熱變形與熱應(yīng)力分析,發(fā)現(xiàn)不帶網(wǎng)套的波紋管高溫工況下熱應(yīng)力和熱變形分布更均勻,說明僅高溫工況下,網(wǎng)套的作用并不明顯。所得結(jié)果對(duì)各類化工裝置在各種復(fù)雜工況下的金屬軟管的設(shè)計(jì)、選用與安全維護(hù)均具有參考價(jià)值。
[Abstract]:Corrugated metal hose is a large and wide compensation element in chemical pipeline system. It mainly plays an important role in withstanding internal pressure, compensating axial displacement, lateral displacement, thermal deformation of pipeline, vibration isolation and noise reduction, etc. It is a weak link in the integrity and sealing of pipeline system. Therefore, its reasonable design and safe operation are of great significance to the safety production of various petrochemical plants. In this paper, ANSYS nonlinear finite element method is used to analyze the static and thermal properties of double corrugated metal hoses with netting. Three dimensional quadratic isoparametric element discrete bellows and beam element discrete mesh jackets are used to describe the interaction between the bellows and the meshes by using the node coupling method. The elastoplastic constitutive relations, geometric nonlinearity and interlayer contact nonlinearity are considered. Three-dimensional finite element models of double-layer bellows and double-layer metal hoses with mesh are established. First, the stress distribution of metal hose under axial displacement is obtained, and the reinforcement of bellows is verified. Secondly, the stress distribution law of metal hose under the action of transverse displacement is obtained by applying transversal displacement load on metal hose. The stress distribution of inner bellows has the phenomenon of "neutral layer". Finally, the thermal element discrete bellows with the same nodes are selected, and considering the influence of dead air layer between the corrugated tubes, the temperature field under the high temperature operation condition is analyzed, and then the thermal deformation and thermal stress of the metal hose are analyzed. It is found that the distribution of thermal stress and thermal deformation of bellows without mesh sleeve is more uniform under high temperature condition, which indicates that the effect of net sleeve is not obvious under the condition of high temperature. The results are of reference value for the design, selection and safety maintenance of metal hoses for various chemical plants under various complex working conditions.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ055.81

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