A new numerical procedure to predict dynamic void content in liquid composite molding
A new numerical procedure to predict dynamic void content in liquid composite molding
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DOI：
10.1016/j.compositesa.2005.12.017
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发表时间：
2006-01-01
影响因子：
8.7
通讯作者：
Krawczak, P.
中科院分区：
文献类型：
--
作者：
Gourichon, B.;Binetruy, C.;Krawczak, P.
高纤维束数织物是由纤维和织物供应商开发的，以满足汽车成本和性能的要求，当使用树脂传递模塑（RTM）以高生产率制造汽车结构复合材料零件时。这些大纤维团的浸渍可能导致织物局部不完全饱和。可能会出现机械软化、早期失效或由于高空隙含量而导致的零件报废。随着RTM越来越接近于用于结构复合材料零件的工业高生产率，模拟工具，包括空洞含量预测受到越来越多的关注。本文提出了一种新的数值计算方法来预测液态复合材料成型过程中的动态孔隙率。介绍了气泡夹持和孔隙动员临界压力的概念。对于特定的树脂/tow表面接触，与实验测量的不饱和体积在I D流动中有很好的一致性。计算结果强调，快速注入可能导致整体孔隙含量低，但局部孔隙含量非常高。(c) 2005 Elsevier Ltd版权所有。
High fiber tow count fabrics have been developed by fiber and fabric suppliers to meet automotive cost and performance requirements when manufacturing structural automotive composite parts at high production rates by resin transfer molding (RTM). Impregnation of these large fiber clusters may lead to local incomplete saturation of fabrics. Mechanical softening, early failure, or part rejection because of high voids content may be expected. As RTM is getting closer to become available for industrial high production rates of structural composite parts, simulation tools, including void content predictions are receiving more attention. The present work proposes a new numerical procedure to predict dynamic void content in liquid composite molding (LCM) processes. The concepts of air bubbles entrapment and critical pressure for void mobilization are introduced. Good agreement was found for a particular resin/tow surface contact with experimentally measured unsaturated volumes for I D flow. The calculations highlight the idea that fast injections could lead to low global void content but very high local void content. (c) 2005 Elsevier Ltd. All rights reserved.