Farraginous carbon fiber composite material, preparation method and application thereof

A composite material and carbon fiber technology, applied in fiber processing, fiber chemical characteristics, yarn, etc., can solve problems such as brittle fracture, monitoring accuracy needs to be improved, and material fracture

Inactive Publication Date: 2007-03-07
吴智深 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For fiber-reinforced composite materials containing only one conductive phase (such as carbon fiber), the change rate of resistance is very small, usually less than 2%, before the conductive fiber breaks, and the monitoring accuracy needs to be improved and staged monitoring cannot be carried out. ; Moreover, the material is ofte...

Method used

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  • Farraginous carbon fiber composite material, preparation method and application thereof
  • Farraginous carbon fiber composite material, preparation method and application thereof
  • Farraginous carbon fiber composite material, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0027] Embodiment 1, hybrid carbon fiber reinforcement

[0028] The structure of the hybrid carbon fiber reinforcement is shown in Figure 2. The hybrid carbon fiber bundle 2 is a mixture of carbon fiber A21 (high elastic modulus carbon fiber), carbon fiber B22 (medium elastic modulus carbon fiber), and carbon fiber C23 (high-strength carbon fiber) with different properties. The resulting aggregates are formed by impregnating these carbon fiber bundles with epoxy resin 3 . The strength, modulus and ductility of carbon fiber A21, carbon fiber B22, and carbon fiber C23 that make up the hybrid carbon fiber bundle 2 are different, and the appropriate ratio can be designed according to the specific use conditions. When the hybrid composite material is used as a structural material and a sensing material, the hybrid The proportion of medium modulus and high strength fibers in the material can be appropriately increased, and if it is mainly used as a sensing material, the volume conte...

Embodiment 2

[0031] Embodiment 2, sheet-like hybrid carbon fiber composite material

[0032] The structure of the sheet-like hybrid carbon fiber composite material is shown in Figure 4. The hybrid carbon fiber sheet 5 can be formed by impregnating and hardening the hybrid carbon fiber bundle 2 with epoxy resin 3, or it can be formed by three kinds of carbon fiber sheets (high-strength carbon fiber, Medium elastic modulus and high elastic modulus carbon fiber sheets) are impregnated, mixed and hardened with epoxy resin by lamination method. The hybrid carbon fiber sheet 5 also has the function of monitoring the strain and damage state of the structure. For example, the sheet-like hybrid carbon fiber material 5 can be pasted to the lower part of the structure along the direction of force with resin and used as a sensing material and a reinforcing material.

[0033] Figure 5 is a schematic diagram of the resistance measurement of a sheet-like hybrid carbon fiber composite material. A tensile ...

Embodiment 3

[0035] Example 3. Application of hybrid carbon fiber bars in strengthening and monitoring the strain state of concrete structures

[0036] FIG. 7 is a schematic diagram of applying hybrid carbon fiber bars to concrete structures. There is no reinforcing steel bar in the concrete beam 10, and two hybrid carbon fiber bars 11 are distributed in the concrete beam as shown in FIG. 7 . The hybrid carbon fiber reinforcement 11 can be used as a reinforcing material to enhance the stiffness and bearing capacity of the structure, and can also be used as a sensing material to monitor the strain and damage of the structure 10 . The stress state and damage state inside the structure 10 can be judged by measuring the resistance change rate of 11 . Hybrid carbon fiber reinforcement 11 contains four kinds of fibers, three of which are carbon fibers (high elastic modulus carbon fiber A21 (elastic modulus is 640GPa), medium elastic modulus carbon fiber B22 (elastic modulus is 392GPa) and high-s...

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Abstract

This invention discloses one mixture carbon fiber compound materials and its application, which comprises the following parts: spring mode volume as 500-650GPa carbon fiber A; spring mode as 360- 450GPa carbon fiber B and string intensity as 3200-5000MPa carbon fiber C. Due to used carbon fiber of high intensity and rigidity, it comprises good conductivity and piezoelectricity effect.

Description

technical field [0001] The invention relates to a hybrid carbon fiber composite material and its preparation method and application, in particular to a hybrid carbon fiber composite material and a device for monitoring the strain and damage of a structure made of the hybrid carbon fiber composite material, and the composite material in the monitoring structure application of stress, strain and damage. Background technique [0002] Carbon fiber has superior mechanical properties such as high specific strength and specific stiffness, its strength is about 10 times that of iron, and its density is only 1 / 4 to 1 / 5 of steel, and it has good durability and excellent corrosion resistance Therefore, it is widely used as a reinforcing or structural material in many fields. Usually, when used as a reinforcing material, carbon fiber is impregnated with resin (that is, carbon fiber is infiltrated with epoxy resin and then hardened), and made into a sheet, rod or grid shape. Carbon fib...

Claims

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Application Information

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IPC IPC(8): D01F9/12D06M15/55D02G3/02G01L1/22
Inventor 吴智深杨千才叶列平
Owner 吴智深
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