An experimental technique to characterize interply void formation in unidirectional prepregs

An experimental technique to characterize interply void formation in unidirectional prepregs
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表征单向预浸料层间空隙形成的实验技术

DOI:
10.1177/0021998316650273
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发表时间:
2016
影响因子:
2.9
通讯作者:
Helmus R
Helmus R
中科院分区:
材料科学3区
文献类型:
--
作者:
Helmus R

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高压釜外预浸料处理需要在处理的早期阶段抽空挥发物,以实现可接受的最终空隙含量。在这项研究中,单一的预浸料层铺设到玻璃工具,以模拟一个预浸料层界面,以获得初始的空气截留和最终的去除机制的理解。在使用各种边缘呼吸配置的处理过程中记录接触,以确定疏散路径和接触演变之间的关系。通过表征预浸料表面,证明了沿材料纤维方向沿着存在优先流动通道。在延长的环境温度真空保持期间,这些通道中的气体排空防止了接触。在环境真空保持期间,预浸料坯和玻璃工具之间的接触平衡在80%左右,并且在由于水分蒸发而短暂失去接触之后,当树脂压力降低至低于水蒸气压力时,在升高的温度下达到完全接触。
Out-of-autoclave prepreg processing requires evacuation of volatiles in the early stages of processing to achieve an acceptable final void content. In this study, single prepreg plies were laid-up onto a glass tool to simulate a ply–ply interface, to gain an understanding of initial air entrapment and eventual removal mechanisms. The contact was recorded during processing with various edge breathing configurations to identify the relationship between evacuation pathways and contact evolution. The existence of preferential flow channels along the fibre direction of the material was demonstrated by characterizing the prepreg surface. Gas evacuation in those channels prevented contact during an extended ambient temperature vacuum hold. The contact between the prepreg and glass tool equilibrated around 80% during the ambient vacuum hold, and reached full contact at elevated temperature after a brief loss in contact due to moisture vaporization, when the resin pressure decreased to below the water vapour pressure.
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DOI: 10.1179/2055035914y.0000000005
发表时间: 2015
期刊: Advanced Manufacturing: Polymer & Composites Science
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