一种可适用于瞬态辐射换热问题的蜂窝夹芯壳体有限单元

提出一种三层32 结点温度壳单元, 对蜂窝夹芯复合材料壳体的瞬态温度场进行了有限元分析。分别假定上下面板与芯层沿厚度方向的温度分布规律, 事先近似满足上下表面的热边界条件及层间的温度连续条件, 以消减总的自由度数。壳体内外表面可以同时考虑热流、对流及辐射换热边界条件, 并通过温度的后处理使芯层温度场也满足层间的热流连续条件, 从而进一步提高温度场计算的准确性。两个实例分析验证了所提出单元的可靠性与有效性。

A KIND OF HONEYCOMB SANDWICH SHELL FINITE ELEMENTFOR TRANSIENT RADIATION HEAT TRANSFER PROBLEM

A kind of three layered 32-node temperature shell element is presented for the transient temperature field FEM analysis of the honeycomb sandwich composite shell. The temperature distribution in the thickness direction of the top and bottom face sheets and the core layer was assumed, respectively, to satisfy the thermal boundary conditions of the top and bottom surfaces and the condition of continuous temperature at the interfaces and to reduce the total number of the degrees of freedom. The considered thermal boundary conditions on the inner and outer surfaces of the shell may include heat flux, convection and radiation at the same time. The post processing was carried out so that the temperature distribution in the core layer also satisfies the condition of continuous heat flux at the interfaces and the accuracy of the temperature result is further improved. Two examples are provided to show the reliability and validity of the element.