不同材料复合结构温度场的有限元算法改进

Improvement on FEM Algorithm for the temperature field of heterogeneous material

传统的热传导有限元方程以导温系数和等效表面散热系数作为基本参数,当用以计算比热和容重乘积相差较大的多种材料组成的非均质问题时,会带来较大误差。从热量平衡方程出发,提出的直接用导热系数、表面散热系数和热量为基本参数的热传导有限元算法,对原来方法进行了改进。计算实例表明,这种方法可以正确地计算不同材料组成的复合结构的温度场。

The traditional FEM equation for heat conduction uses temperature conductivity and equivalent surface coefficient of heat conduction as the primary parameters, when it is used to solve the heat conduction problems of heterogeneous material or structure formed by many materials with a different product of specific heat and specific gravity, there will be big errors, sometimes leads to wrong results Based on heat balance equation, this paper makes an improvement on the original method by using heat conductivity, surface coefficient of heat transfer as the basic parameters The numerical results showed that the proposed method could be used to calculate the temperature field of heterogeneous or compound materials correctly