Embedded co-curing stitch damping thin film composite material and manufacturing process thereof

Abstract

The invention discloses a manufacturing process of an embedded co-curing stitch damping thin film composite material. The manufacturing process comprises the following steps that preformed body is formed according to the stacking sequence of lower layer poor-glue prepreg, a small part of the vulcanized damping film or the poor-glue prepreg with the damping film and upper layer poor-glue prepreg; the preformed body is stitched by using fiber yarns according to design requirements, and a stitched preformed body is formed; then resin is introduced into the stitched preformed body and a resin stitched preformed body is formed; then sweep-frequency vibrating shock treatment is conducted on the system of the resin stitched preformed structure; and finally, the resin stitched preformed body subjected to the sweep-frequency vibrating shock is co cured according to co-curing process parameters, and then the embedded co-curing stitch damping thin film composite material is obtained. The greatest innovation of the manufacturing process is that the embedded co-curing stitch damping composite material is manufactured by a vacuum introduction method using low temperature vulcanization damping material components, the poor-glue prepreg and sweep-frequency vibration, and the whole mechanical properties of the structure are improved.

Description

technical field [0001] This application belongs to the research field of composite materials with integrated functions and structures, and specifically relates to an embedded co-cured suture damping film composite material and its manufacturing process. Background technique [0002] Today, with the rapid development of aviation and aerospace technology, traditional materials and structures can no longer meet the design requirements of light weight, high stiffness, and large damping performance of aircraft. The embedded co-cured composite material damping structure is based on almost maintaining the mechanical properties of traditional composite materials. A new structure with high damping and vibration reduction performance is proposed, which combines three materials with different properties through physical or chemical methods to form a multi-phase solid. From the analysis of composition and structure, one phase The layer is basically continuous, called the matrix; the oth...

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Problems solved by technology

Studies have shown that as long as the ratio of the perforated area to the total area is within 5%, and the smaller the holes on the damping film, the more the number of resin nails per unit area, the smaller the interlayer bonding stress concentration factor, and the overall structure. Only when the damping film is embedded in the composite material prepreg can the holes be processed effectively, and the prepreg resin in the molten state will penetrate the entire damping layer during the co-curing process, making the damping layer both The composite material on the side is coupled up and down by resin nails or resin strips, but as the diameter of the coupling structure decreases, the flow resistance increases, and the fluidity of the molten resin flowing through the perforation will become poor. The possibility of forming a coupled "resin nail or resin strip" structure is decreasing, and it is difficult to control the geometrical precision of resin nails or resin strips, resulting in unstable interlayer bonding performance and overall structural stiffness

At present, although the manufacturing process of the stitched sandwich structure composite material has been proposed, the commercially available vulcanized rubber material is used in the composite material, and one of the characteristics of the commercially available vulcanized rubber material is that the viscoelastic material sheet is processed. It is difficult to process a uniform damping film due to the limitation of equipment process, which is generally more than 0.3mm, and it is relatively thick to use. The test of high temperature and pressure during the curing of the impregnated material will cause the damping material that has been vulcanized before being embedded in the prepreg to age and return to its original state, and lose some or even most of its mechanical properties, resulting in the loss of the damping performance and bearing capacity of the entire structure.

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