A study on the mold filling process in resin transfer molding
A study on the mold filling process in resin transfer molding
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DOI：
10.1002/pen.760311102
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发表时间：
1991-06
影响因子：
3.2
通讯作者：
M. Um;W. Lee
中科院分区：
文献类型：
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作者：
M. Um;W. Lee
采用边界元法对树脂传递成型充型过程进行了数值模拟。并进行了实验验证。采用各向异性多孔介质的达西定律，结合质量守恒构造控制微分方程。利用边界元技术解决了由此产生的势问题。随着树脂前沿的移动导致计算域的改变，边界节点在每一时间步进行重新排列。将随着时间的推移而离开计算域的节点重新定位在实体边界与节点在前一个时间步长与当前时间步长所画直线的交点处。结果与矩形模具的数据吻合较好。为了进一步评价模型的有效性，计算了充型过程中树脂浸渍区域的面积速度。将计算得到的面积速度与相应的树脂入口速度进行比较，以验证质量守恒。结果表明，该算法具有较高的可靠性。通过对复杂几何图形的数值计算，验证了该方法的有效性。
A numerical simulation of the mold filling process during resin transfer molding (RTM) was performed using the boundary element method (BEM). Experimental verification was also done. Darcy's law for anisotropic porous media was employed along with mass conservation to construct the governing differential equation. The resulting potential problem was solved with the boundary element technique. As the calculation domain changed due to the proceeding resin front, boundary nodes were rearranged for each time step. The node which goes out of the calculation domain as time progresses was relocated at the intersection between the solid boundary and the line drawn between the node at previous and at current time steps. Results showed good agreement with data for a rectangular mold. To evaluate further the validity of the model, the area velocity of the resin-impregnated region during mold filling was calculated. The area velocity thus calculated was compared with the corresponding resin inlet velocity to check the mass conservation. A close agreement was observed, which renders confidence in the resin front proceeding algorithm. Numerical calculations were also performed for complicated geometries to illustrate the effectiveness of the current method.