Variable-rigidity sandwich composite material structure based on 3D printing and forming method thereof

Abstract

The invention discloses a variable-rigidity sandwich composite material structure based on 3D printing and a forming method thereof, and belongs to the technical field of composite material structuredesign and manufacturing. Variable stiffness sandwich structure design is achieved by changing the wall thickness, the distribution uniformity and the geometrical shape of a core material in the sandwich structure. According to the forming method, firstly, a three-dimensional digital model of the sandwich structure is established, the stress distribution condition of the loaded part is analyzed according to working conditions, the thickness and density distribution of the core material is optimized, and then the integrated preparation of the sandwich structure is realized by utilizing a continuous fiber additive manufacturing process. According to the variable-rigidity sandwich structure designed by the invention, the rigidity and strength of the structure on the normal cross sections of different areas are different according to different working conditions, the designability of the sandwich composite material structure is expanded, and a new design thought is provided for lightweightdesign of the sandwich structure. Meanwhile, the manufacturing method provided by the invention can realize integrated forming of the complex variable-rigidity sandwich composite material structure,and the part manufacturing efficiency and quality are improved.

Description

technical field [0001] The invention relates to the field of design and manufacture of composite materials, in particular to a 3D printing-based variable stiffness sandwich composite material structure and a forming method thereof. Background technique [0002] The sandwich structure is usually also called a sandwich structure, and usually consists of three parts: an upper panel, a lower panel, and a core material. The upper and lower panels are glued together through an adhesive layer. When the honeycomb structure bears the out-of-plane load, it can reduce the weight by 70%-90% under the premise of ensuring that the bending stiffness is not much different from that of the solid structure of the same material and thickness, which is very in line with today's requirements for lightweight structures. Advanced composite materials are valued by people for their high strength, high specific modulus, high temperature resistance, and excellent performance designability. They have ...

AI Technical Summary

Problems solved by technology

It is usually shaped by manual paving during manufacturing. First, lay the lower panel of the honeycomb, then apply the adhesive film on the lower panel of the honeycomb to lay the processed core material, and then spread the adhesive film on the core material again, and finally lay the honeycomb on the upper panel. As the panel is formed by manual multi-layer paving, there are problems in the forming process that the shape of the sandwich structure is difficult to control accurately, and there are delaminations and wrinkles in the bottom area, and there are differences between the actual dimensions of the parts and the theoretical digital models.

At the same time, variable stiffness cannot be achieved

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