本文選題：弧形鋼閘門 + 銹蝕形態(tài)�。� 參考：《合肥工業(yè)大學(xué)》2016年碩士論文

【摘要】：鋼材銹蝕后的主要形態(tài)分為全面銹蝕和局部銹蝕,全面銹蝕引起截面尺寸的均勻減薄,導(dǎo)致鋼材的強(qiáng)度和剛度有所下降。而局部銹蝕主要為不均勻銹蝕,雖然質(zhì)量損失比均勻銹蝕小,但因可導(dǎo)致結(jié)構(gòu)的不緊密,故其危險性較大,其中由于點(diǎn)蝕、剝蝕等產(chǎn)生的銹蝕坑是導(dǎo)致結(jié)構(gòu)失效的最主要也是最危險的銹蝕形態(tài)�；⌒武撻l門是水工建筑物的重要組成部分,由于其材質(zhì)及特殊工作條件決定了其容易銹蝕的特點(diǎn),銹蝕問題是影響弧形鋼閘門安全的重要因素之一,因此運(yùn)用有限元方法分析計算銹蝕對弧形鋼閘門工作性態(tài)的影響具有十分重要的工程意義。本文在前人研究成果的基礎(chǔ)上,介紹了弧形鋼閘門銹蝕的基本原理、銹蝕影響因素、銹蝕檢測方法及檢測數(shù)據(jù)的處理；對工程實(shí)踐中實(shí)體結(jié)構(gòu)及殼體結(jié)構(gòu)銹蝕坑的有限元建模方法進(jìn)行了總結(jié),在此基礎(chǔ)上,運(yùn)用大型有限元軟件ANSYS二次開發(fā)平臺,重點(diǎn)研究了弧形鋼閘門在考慮銹蝕形態(tài)下的建模方法。對于全面銹蝕,直接運(yùn)用平均蝕余厚度法進(jìn)行模擬；對于局部銹蝕,利用ANSYS高級參數(shù)化編程語言APDL,通過減小銹蝕坑所在位置節(jié)點(diǎn)的厚度來實(shí)現(xiàn)對銹蝕坑的模擬：結(jié)合工程實(shí)例,建立了某水庫溢流表孔弧形鋼閘門銹蝕前后的有限元模型,計算分析了銹蝕對弧形鋼閘門靜力特性的影響；對局部銹蝕區(qū)分別采用平均蝕余厚度法與考慮銹蝕坑的實(shí)際形態(tài)的方法進(jìn)行模擬計算,結(jié)果表明考慮銹蝕坑的實(shí)際形態(tài)對閘門結(jié)構(gòu)應(yīng)力分布規(guī)律有著顯著的影響；結(jié)合弧形鋼閘門銹蝕敏感部位,研究了銹蝕程度增加即銹蝕面積、銹蝕深度同時增加對閘門工作性態(tài)的影響,結(jié)果表明與只考慮銹蝕深度增加相比,同時考慮銹蝕面積、銹蝕深度的增加對閘門應(yīng)力的影響更大。研究結(jié)果可用于分析在役弧形閘門的工作性態(tài),對弧形閘門的日常管理和銹蝕模擬計算提供有效方法及有益指導(dǎo)。
[Abstract]:The corrosion of the steel is divided into overall corrosion and local corrosion, and the overall corrosion causes the uniform thinning of the section size, which leads to the decrease of the strength and stiffness of the steel, and the local corrosion is mainly uneven corrosion, although the mass loss is smaller than the uniform corrosion, but the structure is not closely related, so it is more dangerous. Corrosion pits produced by pitting and denudation are the most important and most dangerous corrosion forms that cause structural failure. The arc steel gate is an important part of the hydraulic structure. The corrosion is one of the important factors affecting the safety of the arc steel gate because of its material and special working conditions, and the corrosion is one of the important factors affecting the safety of the arc steel gate. The analysis and calculation of the effect of corrosion on the working state of the arc steel gate is of great engineering significance. On the basis of the previous research results, this paper introduces the basic principle of the corrosion of the arc steel gate, the influence factors of corrosion, the method of corrosion detection and the processing of the testing data, and the solid structure and the shell knot in the engineering practice. The finite element modeling method of the corrosion pit is summarized. On this basis, using the large finite element software ANSYS two development platform, this paper focuses on the modeling method of the arc steel gate under the consideration of the corrosion form. For the overall corrosion, the method of using the average residual thickness is used to simulate the corrosion, and the ANSYS advanced parameters are used for the local corrosion. APDL is used to simulate the corrosion pit by reducing the thickness of the node at the location of the corrosion pit. A finite element model of the corrosion of the arc steel gate of a reservoir overflow surface is established by combining with an engineering example. The effect of corrosion on the static characteristics of the arc steel gate is calculated and analyzed, and the local corrosion zone is respectively used. The residual thickness method and the method of considering the actual shape of the corrosion pit are simulated. The results show that the actual shape of the corrosion pit has a significant influence on the stress distribution of the gate structure, and the corrosion degree is increased, that is, the corrosion surface, and the corrosion depth increases the workability of the gate at the same time. The results show that the effect of corrosion area and the increase of corrosion depth on the stress of the gate is greater than the increase of corrosion depth, and the results can be used to analyze the working state of the arc gate and provide effective methods and useful guidance for the daily management and corrosion simulation calculation of the arc gate.

【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TV663.2

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