本文選題：真空絕熱深冷容器 + 特征值分析��； 參考：《南昌大學(xué)》2014年碩士論文

【摘要】：本文在參閱了大量國(guó)內(nèi)外文獻(xiàn)及標(biāo)準(zhǔn)的基礎(chǔ)上，通過理論分析、數(shù)值模擬和外壓失穩(wěn)試驗(yàn)研究，對(duì)比研究了國(guó)內(nèi)外壓力容器標(biāo)準(zhǔn)用于真空絕熱深冷容器外壓穩(wěn)定性的設(shè)計(jì)計(jì)算的差異，探索采用了特征值分析和非線性屈曲分析有限元數(shù)值模擬方法，分析得到了典型真空絕熱深冷容器外壓失穩(wěn)的臨界壓力，并得到試驗(yàn)結(jié)果的驗(yàn)證，在此基礎(chǔ)上研究得到了加強(qiáng)圈形式對(duì)臨界壓力的影響規(guī)律，，本文的主要工作和研究成果有： （1）對(duì)比研究了國(guó)內(nèi)外壓力容器標(biāo)準(zhǔn)用于真空絕熱深冷容器外壓穩(wěn)定性的設(shè)計(jì)計(jì)算的差異，并針對(duì)典型真空絕熱深冷容器進(jìn)行了驗(yàn)證，得到國(guó)內(nèi)的外壓計(jì)算標(biāo)準(zhǔn)要比國(guó)外的計(jì)算標(biāo)準(zhǔn)保守。 （2）開展了真空絕熱深冷容器外壓失穩(wěn)的數(shù)值模擬研究。借用有限元分析中的特征值分析、幾何非線性分析和非線性彈塑性分析三種方法，建立真空絕熱深冷容器的數(shù)值分析模型，對(duì)兩個(gè)具體案例進(jìn)行了外壓穩(wěn)定性的數(shù)值計(jì)算，得到了深冷容器承受外壓時(shí)的臨界載荷，特征值分析的計(jì)算結(jié)果和試驗(yàn)結(jié)果較為吻合，從而驗(yàn)證了有限元模擬中的特征值分析的合理性。 （3）開展了不同型式、慣性矩的加強(qiáng)圈對(duì)筒體外壓穩(wěn)定性影響的研究。借用有限元分析的特征值分析和幾何非線性分析方法對(duì)等邊角鋼、T型鋼和扁鋼三種等截面積的加強(qiáng)圈建立的分析模型進(jìn)行數(shù)值模擬計(jì)算。研究表明：三種等截面積的加強(qiáng)圈對(duì)外壓筒體的加強(qiáng)作用是相同的。 （4）開展了應(yīng)變強(qiáng)化技術(shù)對(duì)筒體外壓穩(wěn)定性影響的研究。借用有限元分析的特征值分析和幾何非線性分析對(duì)強(qiáng)化前后的筒體進(jìn)行數(shù)值模擬計(jì)算，并將強(qiáng)化前后的計(jì)算結(jié)果進(jìn)行對(duì)比分析。結(jié)果表明：當(dāng)強(qiáng)化壓力為設(shè)計(jì)壓力的1.5～1.6倍時(shí)，強(qiáng)化后的臨界壓力較強(qiáng)化前有所降低，降低范圍在8%以內(nèi)。
[Abstract]:In this paper, based on a large number of domestic and foreign literatures and standards, theoretical analysis, numerical simulation and experimental study of external pressure instability are carried out.The difference between the design and calculation of the external pressure stability of vacuum adiabatic cryogenic vessels using the pressure vessel standards at home and abroad is comparatively studied, and the finite element numerical simulation methods of eigenvalue analysis and nonlinear buckling analysis are explored.The critical pressure of external pressure instability of typical vacuum adiabatic cryogenic vessel is obtained, and the experimental results are verified. On this basis, the influence law of strengthening ring form on critical pressure is studied. The main work and results of this paper are as follows:1) the difference between the design and calculation of the external pressure stability of the vacuum adiabatic cryogenic vessel using the domestic and foreign pressure vessel standards is compared, and the verification of the typical vacuum adiabatic cryogenic vessel is carried out.The calculation standard of external pressure in China is more conservative than that in foreign countries.Numerical simulation of external pressure instability of vacuum adiabatic cryogenic vessel is carried out.The numerical analysis model of vacuum adiabatic cryogenic vessel is established by using three methods of eigenvalue analysis, geometric nonlinear analysis and nonlinear elastic-plastic analysis in finite element analysis. The external pressure stability of two concrete cases is calculated.The critical load of cryogenic vessel under external pressure is obtained. The calculation results of eigenvalue analysis are in good agreement with the experimental results, which verifies the rationality of eigenvalue analysis in finite element simulation.3) the influence of different types of stiffening ring of moment of inertia on the external compressive stability of cylinder is studied.By using the eigenvalue analysis of finite element analysis and geometric nonlinear analysis method, the numerical simulation is carried out by using the analysis model of three kinds of reinforcing rings with equal cross section area of equal edge angle steel T shape steel and flat steel.The results show that the strengthening effect of three kinds of equal cross section reinforcing ring is the same.4) the effect of strain strengthening technology on the compressive stability of cylinder in vitro was studied.The eigenvalue analysis and geometric nonlinear analysis of finite element analysis are used to simulate the cylinder before and after strengthening, and the calculated results before and after strengthening are compared and analyzed.The results show that the critical pressure after strengthening is lower than that before strengthening, and the range of reduction is less than 8% when the strengthened pressure is 1.5 ~ 1.6 times of the design pressure.
【學(xué)位授予單位】：南昌大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TH49

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