In situ monitoring and analysis of void evolution in unidirectional prepreg
In situ monitoring and analysis of void evolution in unidirectional prepreg
复制标题
单向预浸料中空隙演变的原位监测和分析
DOI：
10.1177/0021998318759183
复制
发表时间：
2018
影响因子：
2.9
通讯作者：
S. Nutt
中科院分区：
文献类型：
--
作者：
Wei Hu;Lessa K. Grunenfelder;T. Centea;S. Nutt
在预浸料层压板的铺层过程中，相邻预浸料层之间不可避免地会夹带空气，但在真空袋固化条件下如何去除这种夹带空气尚不清楚。在这项研究中，开发了一种原位可视化技术，以动态观察在热压釜外预浸料固化过程中的层间空气去除。利用该技术研究了单向预浸料的空气去除和孔隙演化机理。通过检查在固化周期中不同时间制备的层压截面，跟踪预浸料浸渍情况。根据这些数据，基于孔隙率、树脂性能和浸渍时间之间的关系，记录了三级空气去除机制。此外，气泡伸长率与气泡排出率呈正相关。虽然本文讨论的是单向层压板中空洞的特定背景，但为这项工作开发的原位观察技术具有广泛的潜力，可以增强对与非高压釜预浸料相关的加工现象的理解。
In the layup of prepreg laminates, air is inevitably entrapped between adjacent prepreg plies, yet the removal of this inter-ply air under vacuum bag cure conditions is not well understood. In this study, an in situ visualization technique was developed to dynamically observe inter-ply air removal during the cure of an out-of-autoclave prepreg. The technique was used to investigate mechanisms of air removal and void evolution in unidirectional prepreg. Prepreg impregnation was also tracked by inspection of laminate cross-sections prepared at different times during the cure cycle. From these data, a three-stage air removal mechanism was documented based on the relationships between void content, resin properties, and tow impregnation as functions of time. Furthermore, a positive correlation was observed between the rate of evacuation and bubble elongation. Though discussed here in the specific context of voids in unidirectional laminates, the in situ observation technique developed for this work has broad potential to enhance understanding of processing phenomena associated with out-of-autoclave prepregs.
表征单向预浸料层间空隙形成的实验技术
影响因子：
2.9
作者：
Helmus R
通讯作者：
Helmus R