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High-performance carbon fiber composite based on discontinuous fiber structure and preparing method thereof

A fiber structure and composite material technology, applied in other household appliances, household appliances, household components, etc., can solve the problems of failing to give full play to the high-strength characteristics of carbon fiber, weakening the strength of materials, and reducing strength, and achieve good pseudo-ductility and Formability of complex geometries, ease of industrial production, improved tensile strength

Inactive Publication Date: 2020-09-01
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current discontinuous fiber structures are made by introducing cuts perpendicular to the fiber direction in the prepreg, such as Image 6 As shown in a, the strength of the material is weakened, and the notch failure is easy to occur at a lower load level, and the high-strength characteristics of carbon fiber cannot be fully utilized.
like Figure 7 As shown, the tensile strength of the current uncontinuous chopped carbon fiber prepreg (UASC) laminate is about 400Mpa, which is significantly lower than the tensile strength of the traditional continuous carbon fiber reinforced laminate of nearly 800Mpa (Strength improvement in unidirectional arrayed chopped strands with interlaminar toughening. I. Taketa, T. Okabe, A. Kitano. Composites: Part A 40 (2009) 1174–1178)

Method used

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  • High-performance carbon fiber composite based on discontinuous fiber structure and preparing method thereof
  • High-performance carbon fiber composite based on discontinuous fiber structure and preparing method thereof
  • High-performance carbon fiber composite based on discontinuous fiber structure and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In this example, carbon fiber composite materials with discontinuous fiber structures with different parameters α were prepared. The specific content includes:

[0046] The first step is to take out the qualified carbon fiber prepreg from the freezer according to the experimental requirements, and place it at a room temperature of 25°C±2°C for more than 10 hours to soften and adjust; Cut the carbon fiber prepreg; wherein each cut cuts off the carbon fiber prepreg entirely, and its parameter α is shown in Table 1 respectively;

[0047] The second step is to clean the surface of the mold and wipe the outer surface of the upper and lower molds with alcohol; lay carbon fiber prepreg on the lower mold surface according to the design structure, lay carbon fiber prepreg in one direction, lay 8 layers, and remove the prepreg for each layer Isolation plastic film and release paper on both sides of the surface;

[0048] The third step is to remove the outermost layer of prepreg...

Embodiment 2

[0054] In this example, carbon fiber composite materials with discontinuous fiber structures with different parameters d were prepared. The specific content includes:

[0055] The first step is to take out the qualified carbon fiber prepreg from the freezer according to the experimental requirements, and place it at a room temperature of 25°C±2°C for more than 10 hours to soften and adjust; Cut carbon fiber prepreg; where the cutting direction and distribution are respectively Figure 6 b and Figure 6 Two kinds of cut directions and distributions in c, and the parameters d of the two are shown in Table 2, α is 11.3°, and the obtained carbon fiber composite materials are marked as step cut and double-angle cut respectively;

[0056] In the second step, the surface of the mold is cleaned, and the outer surface of the upper and lower molds is wiped with alcohol; carbon fiber prepreg is laid on the lower mold surface according to the design structure, and 8 layers of carbon fib...

Embodiment 3

[0065] In this example, discontinuous carbon fiber-glass fiber hybrid composites with different carbon fiber layers were prepared, and their mechanical properties were studied. Wherein the carbon fiber prepreg is an epoxy resin prepreg of carbon fiber available on the market, and the glass fiber prepreg is a glass fiber epoxy resin prepreg available on the market. The thickness of each layer of carbon fiber prepreg is 0.03mm per layer, and the thickness of each layer of glass fiber prepreg is 0.15mm. Concrete preparation process comprises the following steps:

[0066] The first step is to take out the qualified carbon fiber prepreg from the freezer according to the experimental requirements, and place it at a room temperature of 25°C±2°C for more than 10 hours to soften and adjust; cut carbon fiber prepreg;

[0067] The second step is to clean the surface of the mold, and wipe the outer surface of the upper and lower molds with alcohol; lay two layers of glass fiber prepreg ...

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Abstract

The invention belongs to the technical field of composites, and particularly relates to a high-performance carbon fiber composite based on a discontinuous fiber structure. Carbon fiber prepreg selected by the composite is subjected to mechanical cutting to obtain the discontinuous fiber structure, during cutting, the included angle alpha between a cut opening direction and the fiber direction is larger than 5 degrees and smaller than 25 degrees, a cut opening structure of discontinuous fiber is adjusted, compared with a traditional cutting opening structure, tensile strength, the tensile modulus and the energy absorbing performance of the carbon fiber composite based on the discontinuous fiber structure are improved, meanwhile, the carbon fiber composite based on the discontinuous fiber structure still has the good pseudo ductility and complex geometric structure formability, and a preparing method of the composite is easy to operate and convenient to industrially produce.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a high-performance carbon fiber composite material based on a discontinuous fiber structure. Background technique [0002] As the so-called "one generation of materials, one generation of equipment", the new material industry is one of the national strategic emerging industries, which determines the level of a country's equipment development. Developed countries such as Europe and the United States attach great importance to the development of new material technology and have put forward clear development plans, such as German Industry 4.0, the US National Nanotechnology Program and the Materials Genome Program. Among them, carbon fiber composite material (CFRP), as a new military-civilian dual-use material, is an important guarantee for realizing the lightweight of aerospace equipment and accelerating the development of construction, energy, transportatio...

Claims

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Application Information

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IPC IPC(8): B29C70/34B29C70/54B29C70/12B29L31/30
CPCB29C70/345B29C70/54B29C70/12B29L2031/3005
Inventor 胡军峰陈舟于苏东张旭彤王一帆郭文康
Owner NANJING UNIV OF TECH
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