Lab-based in-situ micro-CT observation of gaps in prepreg laminates during consolidation and cure
Lab-based in-situ micro-CT observation of gaps in prepreg laminates during consolidation and cure
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DOI：
10.1016/j.compositesa.2020.106180
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发表时间：
2021-01-01
影响因子：
8.7
通讯作者：
Potter, Kevin
中科院分区：
文献类型：
--
作者：
Kratz, James;Galvez-Hernandez, Pedro;Potter, Kevin
开发了一种实验技术来获取两种典型铺叠特征的 3D 微观结构信息，这两种典型铺叠特征经常出现在自动纤维铺放 (AFP) 或自动铺带 (ATL) 中。研究了相邻层之间的平行层间隙和改变复合层压板厚度所需的层降间隙。使用实验室 CT 扫描仪，在制造过程中观察到不同的挤压和出血机制。最初的大间隙被纤维和/或树脂流封闭，平行层间隙固结得更快，并达到比层降间隙更低的孔隙率水平。然而，在达到最小孔隙率后，先前固结的空隙再次出现并保持锁定在最终的微观结构中。原位 CT 数据有助于确定未来工艺模型开发的机会。总体而言，基于实验室的原位显微 CT 被证明是一种有效且易于使用的技术，可用于研究复合材料特征在制造过程中如何演变。
An experimental technique was developed to obtain 3D microstructural information on two typical lay-up features that often appear in automated fibre placement (AFP) or automated tape laying (ATL). Parallel-ply gaps between adjacent courses and ply-drop gaps needed to change the thickness of composite laminates were studied. Using a lab-based CT scanner, the different squeezing and bleeding mechanisms were obser ved while the manufacturing process was occurring. The initially large gaps were closed by fibre and/or resin flow, with the parallel-ply gap consolidating faster and reaching a lower porosity level than the ply-drop gap. However, after reaching a minimum porosity, previously consolidated voids reappeared and remained locked into the final microstructure. The in-situ CT data was helpful to identify opportunities for future process model developments. Overall, lab-based in-situ micro-CT was proven to be an effective and accessible technique to study how composite features evolve through the manufacturing process.