复合材料等厚层板热压成型中树脂流动过程数值模拟

树脂基复合材料热压成型过程中树脂流动在很大程度上决定着层板纤维含量、 孔隙含量以及层板尺寸 , 根据有效应力原理与达西渗流定律建立了描述复合材料等厚层板热压成型过程树脂流动与纤维密实的数学模型 , 采用有限单元方法实现了热压成型中纤维密实均匀状况的预报。分析了温度边界条件、 铺层方式对树脂流动过程的影响。结果表明: 温度边界条件对计算结果影响比较大 ; 铺层方式对层板厚度以及纤维体积分数分布规律影响非常大 ; 边界条件以及材料参数的准确性直接影响计算结果的可靠性。以 T700S/环氧 5228单向层板为例进行了实验验证 , 结果表明计算与实验结果的一致性非常好。 

Numerical simulation on resin flow of laminated composites in hot pressing process

Resin flow is the major mechanism affecting the fiber content , void content and laminate dimension during the hot pressing process. Based on the effective st ress principle and Darcy law , a mathematic model and the corresponding finite element model were developed to simulate the resin flow and fiber compaction process. With the numerical simulation system , the fiber distribution can be predicted in the laminate. The effects of the temperature boundary and lay-up type of the fiber bed on the resin flow process were studied. It was found that the temperature boundary has a large influence on the numerical results while the lay-up type largely affect s the laminate thickness and fiber dist ribution. At the same time , it was validated that the accuracy of the boundary condition and material parameters impact s the reliability of the simulated results. For the T700S/ epoxy 5228 unidirectional laminates ,there was a good agreement between the numerical and experimental data.