Composite lattice structure and preparation method

Abstract

The invention provides a composite lattice structure and a preparation method. The composite lattice structure is composed of an upper face plate, a lower face plate and a lattice core arranged between the upper face plate and the lower face plate. The lattice core is formed in the manner that lattice core triangular fibers and trapezoidal fibers are interlaced. Foam interlayers are arranged in the upper face plate and the lower face plate. A specific injection manner is applied to the composite lattice structure for VARTM formation. The preparation method of the composite lattice structure comprises the seven steps of (1) preparing a fusible alloy mold core; (2) inserting the triangular fibers; (3) laying fibers on the bottom layers of the upper face plate and the lower face plate; (4) inserting the trapezoidal fibers; (5) arranging the face plate interlayers and laying surface fibers of the face plates; (6) conducting VARTM (vacuum assisted resin transfer molding) formation; (7) heating and melting the fusible alloy mold core. The composite lattice structure and the preparation method effectively solve the connection problem between a composite lattice core and the face plates, integrated formation is achieved, the quality is reliable, the technology is simple, and the node strength is high.

Description

technical field [0001] The invention relates to a lattice structure of a composite material and a preparation method thereof, in particular to a preparation process of a lattice structure of a composite material, and belongs to the fields of engineering material preparation and structure design. Background technique [0002] In 2001, Professor Evans of Princeton University, Professor Hutchinson of Harvard University, Professor Ashby of Cambridge University, and Professor Gibson of MIT first proposed the concept of lattice sandwich structure. The lattice structure not only has the advantages of high specific strength and specific stiffness, but also has multifunctional potentials such as energy storage, braking, and pre-embedding. Although some achievements have been made in the preparation method of lattice structure of composite materials, there are still many problems, which have been the focus of research at home and abroad. [0003] The current composite material lattic...

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Problems solved by technology

[0004] The metal mold of the above method (1) is complex to process, difficult to close the mold, and is only suitable for flat plate structures, and cannot prepare curved surface composite material lattice structures

The above method (2) and method (3) use the method of bonding to connect the lattice core and the panel, the strength of the bonding is low, and the nodes are prone to damage

The lattice core fiber of the above method (4) is directly interspersed between the panels, the lattice core fiber is not subjected to external pressure during curing, and the strength of the lattice core fiber rod is low

The above method (5) uses the molten core forming technology, which effectively solves the problem of forming molds, and is very suitable for preparing composite lattice structures with complex shapes. interspersed fiber protrusion

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