發(fā)布時間：2018-04-17 08:57

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

【摘要】：本文在參閱了大量國內外文獻及標準的基礎上，通過理論分析、數(shù)值模擬和外壓失穩(wěn)試驗研究，對比研究了國內外壓力容器標準用于真空絕熱深冷容器外壓穩(wěn)定性的設計計算的差異，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，并得到試驗結果的驗證，在此基礎上研究得到了加強圈形式對臨界壓力的影響規(guī)律，，本文的主要工作和研究成果有： （1）對比研究了國內外壓力容器標準用于真空絕熱深冷容器外壓穩(wěn)定性的設計計算的差異，并針對典型真空絕熱深冷容器進行了驗證，得到國內的外壓計算標準要比國外的計算標準保守。 （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，對兩個具體案例進行了外壓穩(wěn)定性的數(shù)值計算，得到了深冷容器承受外壓時的臨界載荷，特征值分析的計算結果和試驗結果較為吻合，從而驗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、慣性矩的加強圈對筒體外壓穩(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等邊角鋼、T型鋼和扁鋼三種等截面積的加強圈建立的分析模型進行數(shù)值模擬計算。研究表明：三種等截面積的加強圈對外壓筒體的加強作用是相同的。 （4）開展了應變強化技術對筒體外壓穩(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強化前后的筒體進行數(shù)值模擬計算，并將強化前后的計算結果進行對比分析。結果表明：當強化壓力為設計壓力的1.5～1.6倍時，強化后的臨界壓力較強化前有所降低，降低范圍在8%以內。
[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.
【學位授予單位】：南昌大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TH49

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本文編號：1762925