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Defect thermal peeling method of carbon fiber reinforced modified bismaleimide laminate

A bismaleimide layer and carbon fiber technology, applied in the field of failure analysis, can solve the problems such as the inability to directly observe the microscopic morphology of the defect area, the damage to the human body by X-rays, and the large one-time investment, achieving a unique soaking method, The effect of the best peeling effect and accurate process parameters

Inactive Publication Date: 2011-12-21
BEIHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the X-ray inspection method is that it cannot directly observe the microscopic appearance of the defect area. The rays are attenuated due to absorption and scattering during the process of penetrating the material, which makes it limited to use it to detect the thickness of the workpiece. X-ray inspection equipment once Large investment, high testing costs, X-rays are harmful to human body, testing personnel should take special protection

Method used

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  • Defect thermal peeling method of carbon fiber reinforced modified bismaleimide laminate
  • Defect thermal peeling method of carbon fiber reinforced modified bismaleimide laminate
  • Defect thermal peeling method of carbon fiber reinforced modified bismaleimide laminate

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Experimental program
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Effect test

Embodiment 1

[0044] Apply the method provided by the invention to carry out thermal delamination test, and test procedure is as follows:

[0045] Step 1. Selection and preparation of samples.

[0046] Firstly, carry out non-destructive testing on the laminate, determine the approximate location of the defect area, and combine the specific conditions of the plate / structural part and the defect, and intercept an appropriate test sample. The area of ​​the sample is 70×80mm 2 .

[0047] Step 2, prepare the labeling solution.

[0048] A gold chloride diethyl ether solution containing 9% gold by weight was prepared. Preparation method: when preparing, put gold chloride crystals into a glass bottle and cover it tightly with a rubber stopper, then use a syringe to inject an appropriate amount of ether solution from the rubber stopper, and then shake the glass bottle to ensure uniform dissolution to obtain the desired mark solution.

[0049] Step three, soaking.

[0050] Soak the sample with 9...

Embodiment 2

[0057] Step 1. Selection and preparation of samples.

[0058] First, carry out non-destructive testing on the laminate, determine the approximate location of the defect area, and combine the specific conditions of the plate / structural part and the defect, and intercept an appropriate test sample. The area of ​​the sample is 40×60mm 2 .

[0059] Step 2, prepare the labeling solution.

[0060] A gold chloride diethyl ether solution containing 11% gold by weight was prepared. Preparation method: when preparing, put gold chloride crystals into a glass bottle and cover it tightly with a rubber stopper, then use a syringe to inject an appropriate amount of ether solution from the rubber stopper, and then shake the glass bottle to ensure uniform dissolution to obtain the desired mark solution.

[0061] Step three, soaking.

[0062] Immerse the sample with 10% gold chloride ether solution, soaking method: fix two open containers to the two sides of the drilled hole on the sample r...

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Abstract

The invention discloses a defect thermal peeling method of a carbon fiber reinforced modified bismaleimide laminate, which includes determining the defect by non-destructive testing of the sample, preparing a marking solution, soaking, pyrolysis, and peeling and sample protection. Step, after the sample is peeled off, the morphology of the defect area is retained and the type, size and specific location of defects such as voids, delamination, poor (rich) fat, matrix cracking, and fiber bending (fracture) are identified, which are further defects. (Damage) formation mechanism analysis and structural component failure analysis provide the most authentic and direct evidence.

Description

technical field [0001] The invention belongs to the technical field of failure analysis, and in particular relates to a defect thermal peeling method of a carbon fiber reinforced modified bismaleimide laminate. Background technique [0002] Since the 1980s, bismaleimide resin has been used as a composite material matrix. It has good moisture resistance, flame resistance and low toxicity. The modified bismaleimide resin has high toughness and moisture resistance. and good process performance. Therefore, the carbon fiber reinforced modified bismaleimide laminate has superior performance than other resin-based composite materials, and is widely used in engineering fields such as aviation and aerospace. [0003] Due to the inherent inhomogeneity of resin-based composite materials, as well as various defects or damages that inevitably occur during processing and use, it greatly affects the performance indicators of the material, which is the cause of failure of composite structu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/44
Inventor 侯卫国张卫方张凤玲董唯莉王越
Owner BEIHANG UNIV
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