發(fā)布時(shí)間：2018-08-13 16:13

【摘要】：對(duì)船體梁的縱向彎曲極限強(qiáng)度的準(zhǔn)確評(píng)估是船舶結(jié)構(gòu)設(shè)計(jì)的基本方面,焊接初始缺陷的存在會(huì)影響結(jié)構(gòu)的剛度與極限強(qiáng)度。準(zhǔn)確預(yù)測(cè)焊接后的殘余應(yīng)力與變形對(duì)極限強(qiáng)度的研究有重要的意義。本文將熱彈塑性有限元方法與船體結(jié)構(gòu)極限強(qiáng)度數(shù)值方法相結(jié)合,更加合理地考慮焊接初始缺陷對(duì)于船體結(jié)構(gòu)極限強(qiáng)度的影響。為了進(jìn)行理想剖面船體結(jié)構(gòu)的極限強(qiáng)度分析本文主要進(jìn)行了以下工作:(1)利用熱彈塑性有限元法與具有截面積分的shell/solid單元模型進(jìn)行板架縱骨焊接的溫度場(chǎng)與應(yīng)力場(chǎng)分析。在此基礎(chǔ)上比較分析了不同邊界條件對(duì)焊接變形與殘余應(yīng)力結(jié)果的影響。將板架周?chē)�的結(jié)構(gòu)簡(jiǎn)化為加筋板的固定邊界,更合理地反映板架中的縱骨焊接變形情況。(2)以理想艙段結(jié)構(gòu)中的縱骨焊接作為研究對(duì)象,考慮結(jié)構(gòu)周?chē)�材料�?duì)加筋板焊接模擬的影響,計(jì)算由焊接引起的殘余應(yīng)力和變形初始缺陷。(3)將理想艙段結(jié)構(gòu)離散為加筋板單元與硬角單元,以加筋板單元為研究對(duì)象,采用非線(xiàn)性有限元方法進(jìn)行極限強(qiáng)度分析。將熱彈塑性有限元分析得到的焊接初始缺陷引入極限強(qiáng)度的分析中,比較有無(wú)初始缺陷以及不同的焊接分析邊界對(duì)結(jié)構(gòu)失效模式與極限強(qiáng)度的影響。得到筋板單元失效后包含后屈曲段的完整平均應(yīng)力應(yīng)變關(guān)系曲線(xiàn),進(jìn)行箱型結(jié)構(gòu)極限強(qiáng)度的逐步破壞法分析。
[Abstract]:The accurate evaluation of longitudinal bending ultimate strength of hull girder is the basic aspect of ship structure design. The existence of initial welding defects will affect the stiffness and ultimate strength of the structure. Accurate prediction of residual stress and deformation after welding is of great significance to the study of ultimate strength. In this paper, the thermal elastoplastic finite element method is combined with the numerical method of the ultimate strength of the hull structure, and the effect of the initial welding defects on the ultimate strength of the hull structure is considered more reasonably. In order to analyze the ultimate strength of the hull structure with ideal section, the main work of this paper is as follows: (1) the thermal elastoplastic finite element method and the shell/solid element model with sectional area are used to analyze the temperature field and stress field of plate frame longitudinal bone welding. On this basis, the effects of different boundary conditions on welding deformation and residual stress are compared and analyzed. The structure around the plate frame is simplified as the fixed boundary of the stiffened plate, and the deformation of longitudinal bone welding in the plate frame is more reasonably reflected. (2) the longitudinal bone welding in the ideal cabin structure is taken as the research object. Considering the influence of materials around the structure on the welding simulation of stiffened plate, the initial defects of residual stress and deformation caused by welding are calculated. (3) the ideal cabin structure is divided into stiffened plate element and hard angle element, and the stiffened plate element is taken as the research object. The nonlinear finite element method is used to analyze the ultimate strength. The initial welding defects obtained by thermoelastic-plastic finite element analysis are introduced into the ultimate strength analysis to compare the influence of the initial defects and different welding analysis boundaries on the failure mode and ultimate strength of the structure. The complete average stress-strain relationship curve of the stiffened plate element including the post-buckling section after failure is obtained. The ultimate strength of the box structure is analyzed by the progressive failure method.
【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U661.43

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