Multi-stage honeycomb structure of unidirectional carbon fiber composite material and preparation method of multi-stage honeycomb structure

Abstract

The invention relates to a multi-stage honeycomb structure of a unidirectional carbon fiber composite material and a preparation method thereof. The structure comprises an upper panel, a sandwich layer of the multi-stage honeycomb structure and a lower panel. The sandwich layer of the multi-stage honeycomb structure is formed by assembling a plurality of interlocked multi-stage honeycomb lock barswith grooves; the multi-stage honeycomb lock bars with grooves comprise upper composite material plates, middle high rigidity foam plates and lower composite material plates; and the composite material plates are plates, each of which is formed by paving two unidirectional carbon fiber composite materials. The structure solves the problem that a low density area of the honeycomb structure of thecomposite material is low in flat compression strength and the shearing strength of the honeycomb structure is lower than that of a pyramid lattice structure of the composite material, so that the resistance to deflection of a honeycomb wall of the composite material is improved, and the flat compression strength and the shearing strength of the honeycomb structure of the carbon fiber composite material are improved.

Description

technical field [0001] The invention relates to a multilevel honeycomb structure, in particular to a multilevel honeycomb structure of unidirectional carbon fiber composite material and a preparation method thereof. Background technique [0002] Due to the excellent mechanical properties of the carbon fiber composite honeycomb structure, however, there are still two mechanical properties that need to be adjusted: First, in the low-density area (150kg / m3), the flat compressive strength of the carbon fiber composite honeycomb structure is not as good as that of carbon fiber Pyramid lattice structure of composite material; Second, its shear strength is not as good as that of carbon fiber composite material pyramid lattice structure. In the low-density area, the composite honeycomb wall is prone to elastic buckling, which is the main reason for its low flat compressive strength; and the small bonding area and weak bonding strength between the composite honeycomb structure and th...

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Problems solved by technology

[0002] Due to the excellent mechanical properties of the carbon fiber composite honeycomb structure, there are still two mechanical properties that need to be adjusted: First, in the low-density area (150kg / m3), the flat compressive strength of the carbon fiber composite honeycomb structure is not as good as that of carbon fiber Pyramid lattice structure of composite material; Second, its shear strength is not as good as that of carbon fiber composite pyramid lattice structure

In the low-density area, the composite honeycomb wall is prone to elastic buckling, which is the main reason for its low flat compressive strength; and the small bonding area and weak bonding strength between the composite honeycomb structure and the panel lead to its Susceptible to core debonding failure under shear loads

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