VARTM的边缘效应数值模拟研究  

Numerical simulation of vacuum cavity edge effect in VARTM process

作　　者：穆文博 严波[1] Mu Wenbo;Yan Bo

机构地区：[1]上海交通大学材料科学与工程学院,上海200030

出　　处：《模具技术》2022年第2期1-7,共7页Die and Mould Technology

基　　金：国家自然科学基金(编号:U20A20288)。

摘　　要：边缘效应是真空辅助树脂传递模塑(VARTM)成型过程中的一种常见现象,其根本原因是模具型腔内一些间隙区域为树脂流动提供了优先路径,使得树脂在这些区域比其他正常孔隙区域有更快的流动速度。基于达西定律建立树脂在纤维预制体中渗透的中面模型,并开发相应的C++数值模拟软件,开展了边缘效应的数值模拟研究。与实验结果对比验证了模型和数值模拟软件的准确性,通过对具有两个内孔结构的纤维预制体树脂充填过程进行数值模拟,研究了浇口对边缘效应的影响,预测和分析了干斑缺陷产生的位置,为浇口、排气的优化设计提供了科学依据。Edge effect is a common phenomenon in vacuum assisted resin transfer molding(VARTM).The intrinsical cause is that some gap areas in the mold cavity create a preferred path for resin flow,so that the resin flow in these areas is faster than other normal areas.In this paper,a midplane model of resin penetration through the fiber preform is established based on Darcy’s law.A C++numercial simulation software is developed based on the model and thus the edge effect is simulated and investigated.The accuracy of the model is verified by comparison with experiment.The filling stage is simulated in a fiber perform with two holes and the effect of injection gate on edge effects is studied.The dry spot location is predicted and analyzed to support optimization of injection gate and air vent.

关 键 词：真空辅助树脂传递模塑(VARTM) 边缘效应 树脂流动 浇口 数值模拟 

分 类 号：TQ320.6[化学工程—合成树脂塑料工业]