ABSTRACT

The hydrodynamic compaction behaviour in transverse (through-thickness) impregnation variants of Liquid Composite Moulding (LCM) results in a non-homogeneous fibre volume fraction distribution. A fully coupled simulation model of the entire family of transverse resin infusion/compression processes is presented, which simulates the hydrodynamic compaction behaviour and predicts the process time, fluid pressure, effective stress, and fibre volume fraction distribution. The model is applied to the compression of a saturated preform stack, resin injection into a dry preform, and Compression Resin Transfer Moulding. The simulations are verified using analytic solutions and validated against experimental results from the literature. Special forms of the constitutive equations are constructed to lead to a constant diffusion coefficient, and the resulting model is solved semi-analytically. The results are used to verify the full non-linear simulation model. Additionally, it is shown that assumptions of quasi-steady flow and uniform deformation introduce significant errors in processes involving direct piston compaction of the fibre preform.

摘要

液体复合成型 (LCM) 的横向（全厚度）浸渍变体中的流体动力压实行为导致不均匀的纤维体积分数分布。提出了整个横向树脂灌注/压缩过程系列的完全耦合模拟模型，该模型模拟流体动力压实行为并预测过程时间、流体压力、有效应力和纤维体积分数分布。该模型适用于饱和预制件叠层的压缩、树脂注入干燥预制件和压缩树脂传递模塑。使用分析解决方案验证模拟，并根据文献中的实验结果进行验证。构造本构方程的特殊形式以产生恒定的扩散系数，并且得到的模型被半解析地求解。结果用于验证全非线性仿真模型。此外，它表明准稳态流动和均匀变形的假设在涉及直接活塞压实纤维预制件的过程中引入了显着错误。