Effect of Laying Sequences on Consolidation Behavior of Uncured Carbon Fiber Prepregs Under Processing Temperatures
DAI Zongmiao1, PENG Xuefeng1, LIU Xizong2,WU Heng2
1 Seventh Thirteen Institute of China Shipbuilding Industry Corporation, Zhengzhou 450015, China 2 Gongyi Van-Research Innovation Composite Materials Co., Ltd, Zhengzhou 451261, China
Abstract: Composite manufacturing includes laying process, compaction process before curing, and curing process. Factors affect prepreg stack compression process include resin flow mechanism, void growth and elimination, and process limits. Analysis of prepreg stack compression behaviors can provide theoretical support for cure cycle optimization. Prepregs consolidation occurs in all steps of composite manufacturing, including prepregs deposition, various temperatures debulking and consolidation during curing step. Prepreg consolidation process is affected by factors, such as resin flow mechanism, void growth and elimination and process limitations. The characterization of prerpreg consolidation behavior can provide theoretical support for curing process optimization. This paper presents consolidation behavior of uncured carbon fiber prepregs, discussing the influence of laying sequences, as is essential for composite manufacturing optimization. The drive for this study is to obtain further understanding of flow mechanism throughout the prepregs consolidation steps. The results showed that the thickness of unidirectional prepreg stack was minimum, followed by quasi-isotropic stack, when compared with cross-ply prepreg stack with the same number of layers. Thickness reduction ratio was also minimum for unidirectional prepreg stack under the same pressure condition, followed by quasi-isotropic stack, which of cross-ply prepreg stack was the largest. Unidirectional stack has adjacent layers of same fiber orientation, while cross-ply stack has adjacent layers of 90°different angle fiber orientation. Quasi-isotropic stack has both of the behaviors, including adjacent layers of same fiber orientation and 45°different angle fiber orientation. When ramped to 70 ℃, the thickness reduction became negligible, because of the compaction limit, which means the prepreg stack had already reached the maximum fiber volume fraction. The width and fiber volume fraction variation exhibited the same trend above 70 ℃. At initial state, the fibers showed a relax condition. However, fibers began to slip under shear force, and nesting occurred, especially in unidirectional laying sequence. This contributed to the resin percolation flow dominated at relative elevated temperature, until reach the maximum fiber volume fraction. Increasing the pressure at this time can increase the resin pressure to suppress pore growth.
1 顾轶卓,李敏,李艳霞,等. 航空学报, 2015, 36(8),2773. 2 王军照.今日制造与升级, 2020, 128(8), 50. 3 Campbell F C. Manufacturing technology for aerospace structural mate-rials, Magnesium and Beryllium, 2006,pp.93. 4 曾艳明, 王海云, 王敏,等. 新技术新工艺, 2017, (1),82. 5 孙建明, 温磊, 李斌太, 等. 中国胶粘剂, 2017, 26(12), 17. 6 张建宝, 赵文宇, 王俊锋,等. 航空制造技术, 2014, 460(16),80. 7 曹忠亮, 富宏亚, 付云忠, 等. 材料导报:综述篇, 2019,33(3),894. 8 Engmann J, Colin S, Adam S. Journal of Non-Newtonian Fluid Mecha-nics, 2005, 132(1-3),1. 9 董安琪, 肇研, 赵新青. 复合材料学报, 2018, 35(5),1095. 10 都涛. 基于碳纤维预浸料铺放的工艺参数分析与试验研究. 浙江大学, 2018. 11 王新龙, 刘明. 能源化工, 2016, 37(4),28. 12 Shuler S F, Advani S G. Journal of Non-Newtonian Fluid Mechanics, 1996, 65(1),47. 13 Servais Colin, André Luciani, Månson J A E. Journal of Non-Newtonian Fluid Mechanics, 2002, 104(2-3),165. 14 Hubert P, Poursartip A. Composites Part A, 2001, 32(2),179. 15 乌云其其格,付宇彤,高旭豪,等. 航空制造技术, 2020, 63(22),5. 16 Gutowski T G, Dillon G.Journal of Composite Materials, 1992,26 (16),2330. 17 孙子恒,王继辉,倪爱清,等. 复合材料科学与工程, 2020, No.322(11),108. 18 Buntain M J, Bickerton S. Composites Part A: Applied Science and Manufacturing, 2007, 38(7),1729. 19 Hubert P, Poursartip A. Journal of Composite Materials, 2001, 35(1),2. 20 Hélénon F, Lukaszewicz H J A, Ivanov D, et al. In: Proceedings of the 19th International Conference on Composite Materials. 2013. 21 Lukaszewicz H J A, Potter K D. Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture, 2011, 226(2), 193. 22 Lukaszewicz H J A, Carwyn W, Potter K D. Composites Part B: Engineering, 2012,43(3), 997. 23 Lukaszewicz H J A, Potter K D. Composites Part A Applied Science & Manufacturing, 2011, 42(3),283. 24 Hall C, Ward C, Ivanov D S, et al. The compaction of uncured toughened prepreg laminates in relation to automated forming.Proceedings of 15th European Conference on Composite Materials, Venice. 2012. 25 Belnoue P H, Nixon-pearson O J, Ivanov D, et al. Mechanics of Mate-rials, 2016, 97,118.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2021, Vol. 35 
