【摘要】：應(yīng)變強(qiáng)化壓力容器由于其輕型化等經(jīng)濟(jì)性優(yōu)勢而得到不斷發(fā)展與運(yùn)用,然其穩(wěn)定性問題是值得探討的問題。本文圍繞應(yīng)變強(qiáng)化壓力容器的穩(wěn)定性問題,分析了應(yīng)變強(qiáng)化技術(shù)對(duì)容器內(nèi)壓塑性穩(wěn)定性和外壓穩(wěn)定性的影響,并分析了帶環(huán)向加強(qiáng)圈的應(yīng)變強(qiáng)化壓力容器的內(nèi)壓塑性穩(wěn)定性及外壓穩(wěn)定性的情況。主要的研究內(nèi)容和結(jié)論如下： (1)確定應(yīng)變強(qiáng)化壓力容器穩(wěn)定性分析的兩個(gè)表征參數(shù)：塑性極限載荷與屈曲臨界載荷；選用ANSYS有限元分析軟件；奧氏體不銹鋼材料模型選用雙線性分析模型；采用廣義弧長法求解非線性方程組及增量彈塑性有限元法確定塑性極限載荷；采用特征值分析法預(yù)測結(jié)構(gòu)的理論屈曲強(qiáng)度,即屈曲臨界載荷。 (2)從理論分析、有限元數(shù)值模擬分析及實(shí)驗(yàn)分析三個(gè)方面分析不同預(yù)應(yīng)變量對(duì)容器內(nèi)壓塑性穩(wěn)定性的影響,均得出如下結(jié)論：預(yù)應(yīng)變強(qiáng)化處理對(duì)容器塑性穩(wěn)定性無影響。 (3)利用有限元分析不同預(yù)應(yīng)變量對(duì)容器外壓穩(wěn)定性的影響。分析得出：預(yù)應(yīng)變處理對(duì)容器外壓穩(wěn)定性有一定的影響,且在不同長徑比下其影響存在一定區(qū)別。當(dāng)長徑比L/DLcr/D時(shí),pcrc/pcr-c關(guān)系無一致規(guī)律,預(yù)應(yīng)變強(qiáng)化處理或增強(qiáng)或減弱容器外壓穩(wěn)定性；當(dāng)長徑比L/DLcr/D時(shí),pcrc/p-c呈e-Bc指數(shù)關(guān)系,預(yù)應(yīng)變強(qiáng)化處理均消弱了容器外壓穩(wěn)定性。運(yùn)用應(yīng)變強(qiáng)化技術(shù)時(shí),將長徑比控制在L/DLcr/D范圍內(nèi)較為合理。 (4)對(duì)帶有環(huán)向加強(qiáng)圈的應(yīng)變強(qiáng)化壓力容器穩(wěn)定性情況分析。分析得出：加強(qiáng)圈的設(shè)置方式對(duì)應(yīng)變強(qiáng)化壓力容器的穩(wěn)定性存在明顯的影響。將加強(qiáng)圈運(yùn)用于應(yīng)變強(qiáng)化壓力容器時(shí),加強(qiáng)圈采用扁鋼截面、等間距放置、內(nèi)置于筒體內(nèi)壁處及采用多道加強(qiáng)圈的方式較為合理。
[Abstract]:Strain strengthened pressure vessel has been continuously developed and applied because of its economic advantages such as lightness. However, its stability is a problem worthy of discussion. In this paper, the influence of strain strengthening technology on the stability of pressure vessels under strain hardening is analyzed. The internal pressure plastic stability and the external pressure stability of the pressure vessel strengthened by strain with ring stiffener ring are analyzed. The main research contents and conclusions are as follows: (1) two characterization parameters of strain-strengthened pressure vessel stability analysis are determined: plastic limit load and buckling critical load, ANSYS finite element analysis software; The model of austenitic stainless steel is bilinear, the generalized arc length method is used to solve the nonlinear equations and the incremental elastic-plastic finite element method is used to determine the plastic limit load. The eigenvalue analysis method is used to predict the theoretical buckling strength of the structure, that is, the buckling critical load. (2) from the theoretical analysis, finite element numerical simulation analysis and experimental analysis, the influence of different prestrain variables on the plastic stability of the vessel is analyzed. The conclusion is as follows: Pre-strain strengthening treatment has no effect on the plastic stability of the vessel. (3) the influence of different pre-strain variables on the external pressure stability of the vessel is analyzed by finite element method. It is concluded that prestrain treatment has a certain influence on the external pressure stability of the vessel, and there are some differences in the influence of the pre-strain treatment on the external pressure stability of the vessel under different ratio of length to diameter. When the ratio of length to diameter is L/DLcr/D, the pcrc/pcr-c relationship is not consistent, and the external pressure stability of the vessel is strengthened or weakened by prestrain strengthening treatment. When the ratio of length to diameter is L/DLcr/D, pcrc/p-c shows a e-Bc exponent relationship, and the prestrain strengthening treatment weakens the external pressure stability of the vessel. It is reasonable to control the aspect ratio in the range of L/DLcr/D when using strain strengthening technique. (4) the stability of strain-strengthened pressure vessel with circumferential stiffener ring is analyzed. It is concluded that the setting of reinforcing ring has obvious influence on the stability of strain-strengthened pressure vessel. When the stiffening ring is applied to the strain-strengthened pressure vessel, it is reasonable to use the flat steel section with equal spacing, and the reinforcing ring is built into the inner wall of the cylinder and the multi-channel stiffening ring is adopted.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH49

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