An experimental study on filling of gaps and void pockets during vacuum-bag-only consolidation of fiber placed preforms

IF 3.6 4区 材料科学 Q2 MATERIALS SCIENCE, COMPOSITES
Jagadeesh N Swamy, Wouter JB Grouve, Sebastiaan Wijskamp, Remko Akkerman
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引用次数: 0

Abstract

Gaps and void pockets are inevitably present in tailored thermoplastic composite preforms manufactured via automated fiber placement (AFP). Filling these gaps and voids can be challenging during the consolidation due to the high viscosity of thermoplastic composites, especially in the case of vacuum-bag-only (VBO) consolidation, where the applied pressure is limited. Therefore, the current work investigates whether one bar pressure is sufficient to fill the gaps and voids during VBO consolidation. For this purpose, two experiments are performed. First, a hot plate setup is built and used to capture the real-time gap-filling behavior during the VBO consolidation. Second, VBO consolidation of tailored preforms is performed to study the filling of ply-drop induced void pockets. Here, the tailored preform consists of plies of different orientations dropped at different locations to verify if one bar pressure available during the VBO process is sufficient to fill the void pockets. The results from both experiments answered the main question that one bar pressure is sufficient for filling the gaps and void pockets for the given material systems, and further, it was confirmed that the transverse squeeze flow was dominant in filling gaps. However, in the case of fillings of ply-drop induced void pockets, the orientation of the dropped ply and covering plies majorly dictated the filling behavior.
关于仅用真空袋固结纤维预成型件过程中填充间隙和空隙的实验研究
在通过自动纤维铺放(AFP)技术制造的定制热塑性复合材料预制件中,不可避免地会出现缝隙和空隙。由于热塑性复合材料的粘度较高,在固结过程中填充这些间隙和空隙可能具有挑战性,特别是在真空袋固结(VBO)的情况下,施加的压力有限。因此,当前的工作研究了一巴压力是否足以填充 VBO 固结过程中的间隙和空隙。为此,我们进行了两项实验。首先,建立并使用热板装置来捕捉 VBO 固结过程中的实时间隙填充行为。其次,对定制预型件进行 VBO 固结,以研究层降引起的空隙填充。在这里,定制预型件由不同方向的层板组成,这些层板被放置在不同的位置,以验证 VBO 过程中的一巴压力是否足以填满空隙。这两项实验的结果都回答了一个主要问题,即对于给定的材料系统,1 巴压力足以填满间隙和空隙。然而,在填充层间空隙时,层间空隙和覆盖层的方向在很大程度上决定了填充行为。
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来源期刊
Journal of Thermoplastic Composite Materials
Journal of Thermoplastic Composite Materials 工程技术-材料科学:复合
CiteScore
8.00
自引率
18.20%
发文量
104
审稿时长
5.9 months
期刊介绍: The Journal of Thermoplastic Composite Materials is a fully peer-reviewed international journal that publishes original research and review articles on polymers, nanocomposites, and particulate-, discontinuous-, and continuous-fiber-reinforced materials in the areas of processing, materials science, mechanics, durability, design, non destructive evaluation and manufacturing science. This journal is a member of the Committee on Publication Ethics (COPE).
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