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1、 分支状金属构件电热耦合效应的 有限元模拟 The finite element simulation of the thermal-electric coupling of branch metal structure 学 院:材料科学与工程学院 专 业 班 级:材料成型及控制工程 班 学 号: 学 生 姓 名: 指 导 教 师: (讲师) 20 年 6 月 密级:公开 摘 要 从分形理论得知,分形结构具有许多优异的性质,如三维树状分形具有很 好的连通性,而且随着分形级数的增加,其表面积将趋于无穷大,即便是在分 形级数有限的情况下,它也具有较大的表面积。这就启示我们,如果能将分形 这种巧妙结
2、构应用到金属材料的制备当中,所得材料无论是在孔洞的连通性、 还是在比表面积等结构性能方面均有望得到提高;而且,还有可能增进其力、 热、电等物理性能,从而满足日益增长的材料性能方面的需要。 本文通过大型模拟软件 ANSYS,对分支状金属构件的电热耦合效应进行 了数值模拟,研究了不同的电压、不同的对流系数以及不同的外界温度对铜制 分支状构件的温度场和电势场的影响,并得出如下结论: (1)随着电压的升高,整个构件的各处温度均有所升高。随着电压的改 变,温度总体趋于下降的趋势,在下降前有一个小的上升,而在分支处有明显 的变化;电势几乎是线性下降,在分支处有小的波动,形成拐点。 (2)随着对流系数的不断
3、升高,电流生成的热量向外界传递的速度变快, 温度总体下降。由于构件前端表面积大,热量丧失的快,因此构件的温度最高 点逐渐向后端移动,且随着对流系数增高,前端的温度与最高点的差距越来越 大。 (3)随着外界温度的降低,整个构件的温度会均匀降低,但分布趋势仍 然一致。 关键词:关键词:有限元模拟;分形结构;电热耦合;温度场有限元模拟;分形结构;电热耦合;温度场 Abstract Learned from the fractal theory, fractal structure has many excellent properties, such as three-dimensional fra
4、ctal tree has good connectivity, and fractal series with the increase of its surface area will tend to infinity, even in a limited series of fractal cases, it also has a large surface area. This tells us that if this ingenious structure of the fractal can be applied to metal materials were obtained
5、material both in the pore connectivity and the structure of the surface area are expected to improve performance; as they may increase its power, heat, electricity and other physical properties of materials to meet the growing performance needs. In this paper, the branch metal components for electro
6、thermal coupling numerical simulation has done by the large-scale simulation software ANSYS.We study the effect of the temperature and electric potential field with different voltage, different convection coefficients and the different branches of the external temperature on the copper component , a
7、nd the following conclusions: (1) As the increase of the voltage, the component parts of both elevated temperature. As the voltage changes, the temperature tends to decrease the overall trend of falling before a small rise significantly in the branch office changes; electric potential is almost line
8、ar decline in the branch with small fluctuations in the formation of inflection point. (2) With the rising of the convection coefficient, the speed of the current generation heat to the outside becomes faster and the overall temperature drop. As the front-end component surface area, the heat loss fa
9、ster. So the highest temperature component gradually move to the back end, and the convection coefficient with increased temperature and the highest point of the front of the growing gap. (3) With the convection temperature decreased, the component will have even lower temperatures.But the distribut
10、ion is still consistent with the trend. Key words: Finite element simulation; Fractal structure; Electrothermal coupling; Temperature field 目 录 摘摘 要要 .I ABSTRACT.II 第第 1 章章 绪论绪论.- 1 - 1.1 分形理论 .- 1 - 1.1.1分形理论的提出.- 1 - 1.1.2 自相似原则.- 1 - 1.1.3 分维作用.- 1 - 1.2 分形理论在材料表界面研究中的应用及进展.- 2 - 1.2.1 材料表界面研究中应用分形理论的方法及分维的测定.- 2 - 1.2.2 材料表面微观形貌的分形研究.- 3 - 1.2.3 复合材料界面的分形研究.- 4 - 1.3 本文的研究意义和研究内容.- 4 - 1.3.1 本文的研究意义.- 4 - 1.3.2 本文研究的内容.- 4 - 第第 2 章章有限元法理论基础及有限元法理论基础及 ANSYS 软件软件.- 6 - 2.1 有限元法.- 6 - 2.1.1 有限元法的由来.