界面渗透率对厚复合材料层板流动-压实过程影响的数值分析

基于有效应力原理与达西渗流定律,建立了厚复合材料层板流动-压实过程的多场耦合有限元数值模型,通过与厚单向板试验结果的对比,验证了模型的正确性。建立了含界面层的厚正交层合板流动-压实计算模型,分析了垂直于层间界面方向的界面渗透率对正交层合板流动-压实过程的影响。通过与同等厚度单向板的分析结果对比表明,当不同方向铺层层间界面渗透率高时,厚正交层合板的流动-压实过程几乎与相同厚度单向板的流动-压实过程相同。但当层间界面的渗透率低时,会阻碍内部树脂的流动,导致正交层合板内部纤维体积含量提升慢,且越靠近内部,界面渗透率的影响越明显,最终在界面处纤维含量出现明显的跳跃分布。

NUMERICAL SIMULATION ON THE EFFECT OF INTERFACE PERMEABILITY ON THE FLOW AND COMPACTION OF THICK COMPOSITE LAMINATES

Based on the effective stress theory and Darcy's flow theory,a multi-field coupled numerical model is developed to simulate the flow and compaction of thick composite laminates.The model is verified by comparing the prediction with the experiment result of a thick unidirectional laminate.A thick cross ply composite laminate model with an interface layer is built,and is used to analyze the effect of the interface permeability on the flow and compaction process of the thick cross ply composite laminate.The calculating results of the thick cross ply composite laminate model are compared with those of the unidirectional laminate model with the same thickness.The results show that,the thick cross ply composite laminate with high interface permeability has the similar flow and compaction process with that of the thick unidirectional laminate.An interface layer with low permeability impedes the flow of the resin in the interior of the thick cross ply composite laminate,and causes a slow increase of fiber content with curing time as compared with that in a unidirectional laminate.The effect of interface layer with low permeability is more obvious in the interior of the thick cross ply composite laminate,and causes a jump in the distribution of fiber content across the interface laver at the end of the flow and compaction process.