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Testing method for anisotropic thermal-expansion coefficient of continuous-fiber-reinforced resin-based composite material

A technology for strengthening resin base and thermal expansion coefficient, applied in the direction of material thermal expansion coefficient, etc., can solve the problems of fragile and easily broken thermal expansion coefficient, and achieve the effect of being conducive to demoulding, avoiding direct contact, and avoiding the introduction of test system errors.

Active Publication Date: 2015-06-03
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies of traditional testing techniques and provide a test method for the anisotropic thermal expansion coefficient of continuous fiber-reinforced resin-based composite materials, to realize the accurate test of the anisotropic thermal expansion coefficient of continuous fiber-reinforced resin-based composite materials, and to solve the problem at the same time Fragility and breakage of FBG sensor in detecting thermal expansion coefficient of fiber composite materials

Method used

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  • Testing method for anisotropic thermal-expansion coefficient of continuous-fiber-reinforced resin-based composite material
  • Testing method for anisotropic thermal-expansion coefficient of continuous-fiber-reinforced resin-based composite material
  • Testing method for anisotropic thermal-expansion coefficient of continuous-fiber-reinforced resin-based composite material

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Embodiment 1

[0037] A test method for the anisotropic thermal expansion coefficient of continuous fiber reinforced resin matrix composites:

[0038] (1) Preparation of composite material samples: Lay resin-based composite material prepregs in the mold cavity, and lay fiber Bragg grating strings on multiple prepreg layers; that is, on the nth layer (n>5) A plurality of fiber Bragg grating strings 2 are laid in the fiber direction (0° direction), and a plurality of fiber Bragg grating strings 3 are laid in the n+i layer (i>5) perpendicular to the fiber direction (90° direction); different from the 0° direction What is more important is that on the FBG sensor laid in the 90° direction, a small piece of resin-based composite material prepreg 4 needs to be used to embed the grating area up and down, and the fiber direction in this small piece of resin-based composite material prepreg is the same as that of the fiber Bragg grating string. In order to protect the grating area without affecting th...

Embodiment 2

[0050] A test method for the anisotropic thermal expansion coefficient of continuous fiber reinforced resin matrix composites:

[0051] (1) Preparation of composite material samples: Lay resin-based composite material prepregs in the mold cavity, and lay fiber Bragg grating strings on multiple prepreg layers; that is, on the nth layer (n>5) A plurality of fiber Bragg grating strings 2 are laid in the fiber direction (0° direction), and a plurality of fiber Bragg grating strings 3 are laid in the n+i layer (i>5) perpendicular to the fiber direction (90° direction); different from the 0° direction What is more important is that on the FBG sensor laid in the 90° direction, a small piece of resin-based composite material prepreg 4 needs to be used to embed the grating area up and down, and the fiber direction in this small piece of resin-based composite material prepreg is the same as that of the fiber Bragg grating string. In order to protect the grating area without affecting th...

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Abstract

The invention relates to a testing method for the anisotropic thermal-expansion coefficient of a continuous-fiber-reinforced resin-based composite material. The testing method comprises the following steps: (1) preparation of a sample, namely laying a plurality of optical-fiber Bragg grating strings among layers of prepregs of the resin-based composite material along 0-degree direction and 90-degree direction respectively, embedding the grating area from top to bottom by using small prepregs on the grating strings laid in the 90-degree direction with the fiber direction of the small prepregs being same as the optical-fiber direction, formed a lead groove in a side-wall frame plate of a mold, coating the surfaces of the side-wall frame plate of the mold and the lead groove with high-temperature-resistant high-molecular thin films, curing the composite material and demolding; (2) testing, namely leading out leads of the optical-fiber Bragg grating strings from an opening of a high-low-temperature thermostat, connecting the leads to an optical-fiber and grating demodulator, sealing the thermostat, heating according to the testing specifications and acquiring data; and (3) data processing. The testing method has the advantages that the optical-fiber Bragg grating strings for detecting the thermal expansion coefficient of the continuous-fiber-reinforced resin-based composite material are well protected and the obtained data is comprehensive, accurate and reliable.

Description

technical field [0001] The invention relates to a test method for thermal expansion coefficient, in particular to a fiber Bragg grating (Fiber Bragg Grating, FBG) test method for the anisotropic thermal expansion coefficient of fiber composite materials. Background technique [0002] Fiber-reinforced resin-based composites are widely used in aerospace, automobiles, ships, construction and other fields due to their high specific strength and specific modulus, good chemical corrosion resistance, and strong designability. Among them, the density of carbon fiber reinforced resin matrix composites is only about 1.6g / cm 3 , superior performance, is expected to become one of the main materials of automobiles and aircrafts. [0003] The physical and mechanical properties of thermosetting composites are significantly affected by the curing process. The curing process involves chemical and physical changes such as heat transfer, material transformation, and crosslinking reactions. If...

Claims

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Application Information

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IPC IPC(8): G01N25/16
Inventor 贾玉玺苏昊耿湘宜智杰颖王海庆王静隋青美
Owner SHANDONG UNIV
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