沟槽型VARTM成型技术的研究

【作者】 王芳；

【导师】 张国利； 陈光伟；

【作者基本信息】 天津工业大学 ， 纺织工程， 2006， 硕士

【摘要】 本文主要对低成本复合材料成型技术-VARTM(Vacuum Assisted Resin TransferMolding，真空辅助树脂传递模塑成型)所涉及的树脂复配、预制件压实、沟槽型VARTM模具结构设计、沟槽尺寸、沟槽间距及沟槽布局，VARTM与RTM成型层合板制件性能比较进行了研究。对适用于VARTM工艺的环氧树脂体系进行了粘度测试和DSC测试研究，确定环氧树脂(E-51)、300~#低分子聚酰胺、TM和稀释剂的配比为100：10：15：15的Al树脂体系符合VARTM成型工艺对树脂体系的要求，并采用双阿累尼乌斯方程研究A1树脂体系在整个工艺温度范围内的粘度特性，建立其粘度方程。用Kissinger法确定了Al树脂体系的表观活化能。利用外推法，结合DSC测试数据，确定Al环氧树脂体系可以选择61～71℃作为固化参考温度，164～174℃作为参考后处理温度。本文对纤维增强体干、湿态的压实性能进行了测试研究，并建立数学模型预测湿态三维编织预制件在不同压力下的纤维体积含量。通过对沟槽型VARTM成型工艺的实验研究，确定沟槽的优化尺寸为：沟槽宽度W=5mm，沟槽深度H=4mm，沟槽间距d≤70mm，最佳沟槽布局为沟槽布局1。对不同铺层厚度纤维增强体的充模实验证实，当厚度很大时，厚度方向的充模时间决定充模时间。采用灰色理论GM(1，1)模型预测了不同铺层厚度纤维增强体最终成型复合材料制件的厚度。利用VARTM成型工艺成功的制作了三维编织复合材料制件。实验结果表明VARTM32艺适用于成型三维编织复合材料。通过对比铺层顺序和厚度相同的VARTM和RTM成型的层合板复合材料制件的拉伸性能和弯曲性能的测试结果，VARTM成型的层合板复合材料制件力学性能优于RTM成型的制件，VARTMI艺成型的三维编织复合材料的拉伸性能优于其他测试材料。因此利用低成本的VARTM成型工艺可以成型性能优异的复合材料制件。更多还原

【Abstract】 In the paper, the resin system suitable for VARTM, compaction of perform, designing the mold for VARTM based on grooves, width, depth and spacing for flow grooves, arrangement of grooves, the mechanics properties of the composite material produced by VARTM and RTM, was studied. A kind of epoxy resin, which is suitable for VARTM, was studied with DSC analysis and viscosity experiments. A viscosity model based on dual -Arrhenius equation was established and could be used to predict viscosity behavior of A1 resin system at different temperature. The surface active energy was calculated by Kissinger method. The referenced curing processing temperature was calculated by Extrapolation, curing temperature is 61-70℃, and post curing temperature is 164-170 ℃.In this paper, compaction of dry and resin-saturated reinforcement was studied. And a model was established to predict the volume fraction of 3D braided perform under deferent pressure. The model was in good agreement with the experimental value.VARTM process based on grooves was studied by experiments. the parameters of width, depth and spacing for flow grooves and spacing for grooves were optimized according on the molding experiments: Width is 5mm,depth is 4mm, spacing for grooves is less than or equal to 70mm. The experiments of perform with deferent thickness show: the mold filling time was decided by thickness when the perform with large thickness. The model of GM (1,1) was established to predict the thickness of composite produced by VARTM. The predict values are in good agreement with the values from experiments.The 3D braided composite material was successfully produced by VARTM. The result shows: VARTM is suitable for producing 3D braided composite.The mechanics properties of deferent composite material produced by VARTM and RTM was studied in this paper. The results show: the mechanics properties of the composite material produced by VARTM are better than the one produced by RTM. The tensile strength of the 3D braided composite material produced by VARTM is better than the others. The results show: VARTM processing can produce composite material with good mechanics properties.更多还原