Preparation method of high-performance fiber-reinforced structure composite material compounded with various excellent properties

Abstract

The invention discloses a preparation method of a high-performance fiber reinforced structure composite material compounded with various excellent properties. The fiber reinforced composite material selects an ultra-thin carbon fiber prepreg (less than 30 micro meters) and a glass fiber prepreg with failure strain greater than 6%, a non-continuous fiber structure is obtained through mechanical cutting, the included angle between the notch direction and the fiber direction during cutting is + / -11 degrees, and all cutting openings are linear sections and are regularly distributed, and meanwhile, a specific laying layer structure and a reinforced sewing technology are adopted, so that the formability, the strength, the final failure strain, the impact resistance and the energy absorption performance of the fiber reinforced composite material are improved. According to the preparation method, the position relation among the discontinuous fiber notches, the size relation of the notches and the relation between the notch size and the external size of a structural part are defined, the mechanical property and the fiber flowing property of the composite material are optimized, the number of the notches is effectively controlled, and efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a method for preparing a high-performance fiber-reinforced structural composite material that combines various excellent properties, including fluidity, pseudo-ductility and impact resistance. Background technique [0002] Lightweight fiber-reinforced composite materials, such as carbon fiber, glass fiber, basalt fiber, etc., as advanced composite materials, can be Widely used in transportation, energy, construction, aerospace, aviation and other fields. However, when traditional continuous fiber reinforced polymer composites (FRP) are molded into complex structural components, uneven resin distribution is prone to occur, which will lead to complex distribution of stress in the component, affect the mechanical properties of the component, and bring pressure to the component. to safety hazards. In this case, short fiber reinforced polymer composites (SFRP...

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Problems solved by technology

[0004] On the other hand, the mutual exclusion of strength and toughness of traditional carbon fiber composite materials is one of the important issues that have plagued its design field for a long time

Although lightweight fiber-reinforced composites have the advantages of light weight, high strength, and high modulus, their brittle nature and weak residual strength limit their application expansion to a certain extent.

For example, due to minor impacts that cause local structural damage inside the material, although the appearance is intact at this time, brittle fractures are prone to occur under loads that do not have obvious damage warnings and are far below the design load

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