考虑锈蚀形态的弧形闸门数值模拟研究

发布时间：2018-05-11 15:08

本文选题：弧形钢闸门 + 锈蚀形态　；参考：《合肥工业大学》2016年硕士论文

【摘要】：钢材锈蚀后的主要形态分为全面锈蚀和局部锈蚀,全面锈蚀引起截面尺寸的均匀减薄,导致钢材的强度和刚度有所下降。而局部锈蚀主要为不均匀锈蚀,虽然质量损失比均匀锈蚀小,但因可导致结构的不紧密,故其危险性较大,其中由于点蚀、剥蚀等产生的锈蚀坑是导致结构失效的最主要也是最危险的锈蚀形态。弧形钢闸门是水工建筑物的重要组成部分,由于其材质及特殊工作条件决定了其容易锈蚀的特点,锈蚀问题是影响弧形钢闸门安全的重要因素之一,因此运用有限元方法分析计算锈蚀对弧形钢闸门工作性态的影响具有十分重要的工程意义。本文在前人研究成果的基础上,介绍了弧形钢闸门锈蚀的基本原理、锈蚀影响因素、锈蚀检测方法及检测数据的处理；对工程实践中实体结构及壳体结构锈蚀坑的有限元建模方法进行了总结,在此基础上,运用大型有限元软件ANSYS二次开发平台,重点研究了弧形钢闸门在考虑锈蚀形态下的建模方法。对于全面锈蚀,直接运用平均蚀余厚度法进行模拟；对于局部锈蚀,利用ANSYS高级参数化编程语言APDL,通过减小锈蚀坑所在位置节点的厚度来实现对锈蚀坑的模拟：结合工程实例,建立了某水库溢流表孔弧形钢闸门锈蚀前后的有限元模型,计算分析了锈蚀对弧形钢闸门静力特性的影响；对局部锈蚀区分别采用平均蚀余厚度法与考虑锈蚀坑的实际形态的方法进行模拟计算,结果表明考虑锈蚀坑的实际形态对闸门结构应力分布规律有着显著的影响；结合弧形钢闸门锈蚀敏感部位,研究了锈蚀程度增加即锈蚀面积、锈蚀深度同时增加对闸门工作性态的影响,结果表明与只考虑锈蚀深度增加相比,同时考虑锈蚀面积、锈蚀深度的增加对闸门应力的影响更大。研究结果可用于分析在役弧形闸门的工作性态,对弧形闸门的日常管理和锈蚀模拟计算提供有效方法及有益指导。
[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.

【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TV663.2

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