Interlaminar-toughened laminated composite material and preparation method thereof

Abstract

The invention discloses an interlaminar-toughened laminated composite material and a preparation method thereof. The laminated composite material comprises in-plane laminated fabrics and interlaminar XY-direction and Z-direction staples. According to the invention, staples with certain length and diameter are uniformly pre-laid according to a certain density among the laminated fabrics; the laminated fabrics are clamped with a metal supporting net; a spunlace treatment is applied, wherein high-pressure micro-flows with certain diameter and pressure intensity are applied to the laminated fabrics; during the spunlace treatment process, water flows interact with the fiber and metal supporting net, such that scattering and agitation are generated, and the interlaminar staples are subjected to displacement, interweaving and combination; with the existence of intermediate gaps among the fabrics, part of the staples enter the intermediate gaps and form a Z-direction structure; after curing, the interlaminar-toughened laminated composite material containing interlaminar and Z-direction staples is obtained. With the method provided by the invention, the I/II mixed interlaminar fracture toughness of the laminated composite material can be improved, and in-plane performance loss is low.

Description

technical field [0001] The invention belongs to the technical field of interlayer toughening of laminated composite materials, and in particular relates to an interlayer toughened laminated composite material structure and a preparation method. Background technique [0002] In the manufacturing method of laminated composite materials, the interlayer mechanical properties of laminated composite materials are mainly enhanced from two aspects: matrix modification and fiber structure design. The main purpose is to minimize the impact on the in-plane performance and not increase the complexity of the method. Under the premise of stability, the overall mechanical properties of laminated composite materials are maximized. In terms of fiber structure design, the current interlayer toughening methods of laminated composite preforms mainly include Z-Pins, acupuncture, and suture technology, but these technologies have certain limitations and deficiencies, which are mainly reflected in...

AI Technical Summary

Problems solved by technology

In terms of fiber structure design, the current interlayer toughening methods of laminated composite preforms mainly include Z-Pins, acupuncture, and suture technology, but these technologies have certain limitations and deficiencies, which are mainly reflected in the following points: 1) The rigid medium is used to introduce interlayer short fibers, and the puncture process will cause mechanical impact and repeated tearing on the main fibers of the laminated preform, thereby causing damage to the in-plane fibers; 2) The "resolution" of in-plane toughening is low, The toughening of local small areas cannot be done well; 3) The production efficiency is low, especially the needling and Z-Pins are not suitable for large-scale batch production; 4) The toughening of interlayer fracture toughness mainly focuses on Ⅰ Fracture mode, rarely combined with II fracture mode for toughening

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