复合材料RTM成型工艺固化过程三维数值模拟

复合材料RTM成型工艺固化过程数值模拟本质上是求解瞬态热传导和固化动力学耦合方程。本文中以控制体积技术将来自放热化学反应的非线性热源项处理成节点集中载荷,并采用有限元方法求解。以厚板构件的二维数值模拟与文献中结果比较证明了本文中方法的正确性,并讨论了厚度对温度分布的影响。对带孔圆筒形构件进行了算例研究,结果表明:本文方法在处理涉及复杂形状的问题时也具有良好稳定性与可靠性。 

THREE DIMENSIONAL CURE SIMULATIONS IN RESIN TRANSFER MOLDING PROCESS FOR COMPOSITES MANUFACTURING

The cure simulation is essentially to solve the coupled equations involved in the transient heat transfer and the cure kinetics of the resin. In this paper, the internal heat generation caused by the exothermic cure reaction was treated as the nodal lumped load with the help of the control volume technique. The finite element method (FEM) was employed to solve the pertinent equations. The numerical example of a thick plank solved with the two dimensional FEM was compared with other researchers and good agreement was obtained. A three dimensional simulation for a cylinder with a hole was presented. The results show that the present procedure is numerically stable and reliable when the complex shape problems are involved.