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Interlayer toughened composite material and preparation method and application thereof

A technology of toughening composite materials and resin materials, which is applied in the field of fiber reinforced composite materials and fiber reinforced resin base layers to toughen composite materials, which can solve the problem of changes, difficulty in accurately controlling the range of shear performance of fiber reinforced composite materials, and The space geometry of the binding yarn coils is complicated, etc., and the bending elastic modulus is improved, the interface interaction is good, and the effect is obvious.

Active Publication Date: 2018-07-17
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the presence of bundled yarns in fiber reinforced composites improves the performance along the thickness direction and effectively avoids delamination between layers of composite materials, the spatial geometry of the bundled yarn coils is complex and will change during the curing process. Therefore, it is difficult to accurately control whether the presence of bundled yarns helps to improve the interlaminar shear performance of fiber-reinforced composite materials or the magnitude of the improvement.

Method used

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  • Interlayer toughened composite material and preparation method and application thereof
  • Interlayer toughened composite material and preparation method and application thereof
  • Interlayer toughened composite material and preparation method and application thereof

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[0035] An aspect of the embodiments of the present invention provides a method for preparing an interlayer toughened composite material, which includes:

[0036] An embodiment of the present invention provides a method for preparing an interlayer toughened composite material, which includes:

[0037] A reinforcing body is provided, the reinforcing body comprising a plurality of first fiber aggregates stacked along its thickness direction, wherein the first fiber aggregate comprises a plurality of first fiber aggregates oriented in a specified direction (ie, a direction perpendicular to the thickness of the reinforcing body). fiber;

[0038] At least one braid is braided with the plurality of first fiber aggregates along the thickness direction of the reinforcement to form a braided structure, wherein each braid is continuously adjacent to two or more first fiber aggregates. pass between the first fibers;

[0039] The braided structure is infiltrated with a fluid containing a...

Embodiment 1

[0092] Embodiment 1: The preparation method of an interlayer toughened composite material involved in this embodiment specifically includes the following steps:

[0093] With carbon fiber as the reinforcing fiber, the multi-layer carbon fiber unidirectional cloth is arranged in parallel along the thickness direction, and the carbon nanotube strips with a thickness of about 15 μm and a width of 5 mm are perpendicular to the direction of the carbon fiber to weave the multi-layer carbon fiber cloth in the thickness direction. The auxiliary process is immersed in epoxy resin, cured and formed into a carbon fiber reinforced composite material, wherein the content of the resin material is 40wt%. Further, for the interlayer performance test results of the interlayer toughened composite material obtained by adding CNT strips in this example, please refer to image 3 shown. The results of the three-point bending test show that the flexural elastic modulus of the interlayer toughened c...

Embodiment 2

[0094] Embodiment 2: The preparation method of an interlayer toughened composite material involved in this embodiment specifically includes the following steps:

[0095] Using polysulfone fibers as reinforcing fibers, multi-layer polysulfone fiber unidirectional fabrics are arranged in parallel along the thickness direction, and graphene strips with a thickness of about 50 μm and a width of 50 mm are perpendicular to the direction of polysulfone fibers. The fiber unidirectional cloth is woven in the thickness direction, and epoxy groups are distributed on the surface of the graphene, which is immersed in unsaturated polyester resin by soaking method, and solidified and formed into a composite material reinforced by sulfonamide fiber, wherein the content of the resin material is 50wt%. The performance test data of the composite material obtained in this embodiment is basically consistent with that of the embodiment.

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Abstract

The invention discloses an interlayer toughened composite material and a preparation method and an application thereof. The preparation method comprises the following steps that a reinforcing body isprovided, the reinforcing body comprises a plurality of first fiber aggregates which are stacked in the thickness direction of the reinforcing body, wherein the first fiber aggregates comprise a plurality of first fibers which are arranged in a specified direction in an orientation manner; at least one braided body is woven with the plurality of first fiber aggregates in the thickness direction ofthe reinforcing body to form the braided structure, wherein each braided body continuously penetrates between every two adjacent first fibers in two or more first fiber aggregates; the weaving structure is soaked in a fluid containing a curable resin material, then curing treatment is carried out, and the interlayer toughened composite material is formed. According to the composite material and the method and the application, the nano-carbon material strips and the like are adopted as the weaving body to weave the reinforcing body in the thickness direction, gaps are avoided between the reinforcing bodies due to the fact that the strips are added, so that a large stress concentration point does not exist in the composite material, and the interlayer toughening performance of the compositematerial is improved.

Description

technical field [0001] The invention relates to a fiber-reinforced composite material, in particular to a fiber-reinforced resin base-layer toughened composite material, its preparation method and application, and belongs to the field of composite material science and technology. Background technique [0002] Fiber-reinforced resin-based composites have the disadvantages of insufficient interlayer toughness and impact damage resistance, and their interlayer properties are far lower than their intralayer properties. An effective approach to composite toughness, impact resistance and delamination resistance. An existing method is to arrange the reinforcing fiber bundles arranged in a straight line in parallel and straight according to the specified direction, and use yarns such as polyester, nylon or aramid to bind them together with textile technology to form a fabric. Immersed in resin, cured and formed into a fiber-reinforced resin-based composite material. [0003] Howev...

Claims

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Application Information

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IPC IPC(8): B29C70/20B29C70/44
CPCB29C70/202B29C70/443
Inventor 吕卫帮于妍妍曲抒旋张远王晗
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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