A three-dimensional braided prepreg with bionic hook structure

Abstract

The invention discloses a three-dimensional braiding pre-impregnated piece with a bionic hooking structure. The three-dimensional braiding pre-impregnated piece comprises a resin layer, two first fiber layers embedded in the resin layer and a sewing fiber layer located between the two first fiber layers and used for connecting the two first fiber layers; a sewing fiber in the sewing fiber layer comprises a plurality of first segments and a plurality of second segments, and the first segments and the second segments are alternately connected to connection points; and the first segments are located between the two adjacent first fiber layers, every two adjacent second segments are correspondingly interlaced on the two first fiber layers, and first hooking structures used for hooking the first fiber layers are arranged at the connection points. The first hooking structures can translate drawing force in the length direction of the second segments into pretightening force in the length direction of the first segments, the connection between layers is more compact under the action of the pretightening force, the integrality and the interlayer performance are good, interlayer damage is not prone to happening, and the interlayer strength, the anti-impact performance and the anti-fatigue performance are improved.

Description

technical field [0001] The invention relates to the technical field of fiber weaving, in particular to a three-dimensional weaving prepreg with a bionic hook structure. Background technique [0002] With the continuous development of modern engineering technology, the application range of composite materials has been continuously expanded. Composite materials can provide sufficient strength and stiffness under the premise of satisfying the lightweight of materials, and are increasingly used in aviation, aerospace, rail transportation, automobiles and other fields. Composite materials with laminated structures can only achieve the purpose of improving the damage tolerance of composite materials by improving the toughness of the resin in the material system, but the results often fail to achieve the expected ideal effect: laminated materials are inevitable in the process of making special-shaped structural parts There will be wrinkles and fiber discontinuity, which makes it d...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a three-dimensional braided prepreg with a bionic hook structure in view of the above-mentioned defects of the prior art, aiming at solving the problems of low interlayer strength and impact resistance of two-dimensional laminates in the prior art. The problem of poor fatigue resistance

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