铺层方式对碳纤维预浸料不同温度下压缩特性的影响

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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.

Key words： prepregs consolidation behavior composites microstructures viscosity

Published: 09 December 2021

CLC number:

V258+.3

Fund:This work was financially supported by National Key R & D Program Funding(2017YFB1300500).

About author:: Zongmiao Dai graduated from Xi'an Jiaotong University in 1996. At present, he works as deputy chief engineer and researcher of the 713 Research Institute of China Shipbuilding Corporation. She has been engaged in technical research and development of special equipment for large warships. In 2015, he enjoyed the special allowance of Henan provincial government. It has successively won one second prize of national science and technology progress award, two first prizes of national defense science and technology progress award, one second prize and one third prize of China Shipbuilding Corporation. She has 15 authorized patents.
Xuefeng Peng graduated from Beijing University of Scie-nce and Technology in 2017, is a doctoral candidate. Now he works as an engineer in the 713 Research Institute of China Shipbuilding Corporation. He is engaged in the research of large warships special equipment robot. In recent five years, he has published 10 SCI/EI papers and applied for 9 invention patents.

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Cite this article:

DAI Zongmiao,PENG Xuefeng,LIU Xizong, et al. Effect of Laying Sequences on Consolidation Behavior of Uncured Carbon Fiber Prepregs Under Processing Temperatures[J]. Materials Reports, 2021, 35(z2): 564-569.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2021/V35/Iz2/564

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