Study on co-curing of precured epoxy composite components

doi:10.19936/j.cnki.2096-8000.20230328.011

Abstract

Abstract: For multi-component composite beams in the advanced pultrusion technology, such as I-beam, the precuring of process for components can reduce the surface viscosity and improve the stiffness to facilitate the assembly of components under the premise of ensuring the bond property of subsequent co-curing. The curing kinetics of resin in M21C prepreg was studied by differential scanning calorimetry (DSC) to determine the curing process, and the viscosity and interlaminar properties of the product under different curing degrees were studied. The results show that the viscosity of prepreg decreases with the increase of curing degree. The viscosity of prepreg can be adjusted by changing the laying temperature. When the precuring degree is 5.5%, the dimension deviation and fiber distortion will lead to the decrease of interlayer performance. When the degree of precuring is 20%, the interlaminar performance is the best. When the degree of precuring is 32% and 45%, the lap interface cannot form a complete three-dimensional network structure, and the interlayer performance is greatly weakened.

Key words: precuring process, degree of cure, co-curing process, interlayer performance, viscosity, composites

CLC Number:

TB332

WU Han, QI Junwei, WANG Yuequan. Study on co-curing of precured epoxy composite components[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(3): 76-82.

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