Preparation method of variable-thickness resin matrix composite structure

Abstract

The invention belongs to the technical field of resin matrix composite structure molding, and relates to a preparation method of a variable-thickness resin matrix composite structure. The variable-thickness resin matrix composite structure is prepared by adopting the following steps: forming a variable-thickness perform by means of an identical ply material thickness lamination structure, and thencuring the variable-thickness perform. The variable-thickness perform eliminates a possibility of difference between pressure fields of resin flowing or difference between cellulosome distributions in the formation of the variable-thickness perform by means of the formation of the identical ply material thickness lamination structure, a high thickness precision variable-thickness perform is obtained, and when the variable-thickness perform is hot-pressed and cured again, the resin system is in a B-stage high-viscosity state, the thickness and the precision are basically set, and high thickness precision features can be maintained, so that the high thickness precision variable thickness composite structure is finally obtained.

Description

technical field [0001] The invention belongs to the technical field of forming resin-based composite material structures, and relates to a method for preparing a variable-thickness resin-based composite material structure. Background technique [0002] The formation process of the traditional resin matrix composite material structure: the laminated structure formed by prepreg, fiber fabric or sizing agent fiber fabric, etc., and then use its own resin system or external resin system with the help of out-of-plane (thickness) The hot pressing effect in the direction completes the composite curing of resin and fiber, and obtains the final resin-based composite material structure. [0003] In the traditional method, the variable-thickness resin-based composite material structure with structural features such as subsidence areas is directly prepared by curing the variable-thickness laminated structure. During the molding process, the molding pressure is uniform, and the variable-...

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Problems solved by technology

[0003] In the traditional method, the variable-thickness resin-based composite material structure with structural features such as subsidence areas is directly prepared by curing the variable-thickness laminated structure. During the molding process, the molding pressure is uniform, and the variable-thickness area will be affected during the molding process. The difference in structural thickness leads to uneven pressure distribution in the thickness direction, which causes the prepreg laminate to form a pressure field for resin flow in the in-plane direction or the fiber volume distribution of the fiber fabric laminate in the in-plane direction to be uneven, and Ultimately, it is difficult for composite material structures to have high thickness accuracy characteristics, especially for large-variable-thickness resin-based composite material structures, the disadvantage of thickness accuracy has restricted the popularization and application of variable-thickness resin-based composite material structures to a certain extent

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