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A Method for Detecting Structural Defects in Composite Materials Using Surface Resonance Visualization Technology

A technology for composite materials and structural defects, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves. It can solve the problems of expensive detection technology equipment and troublesome operation, and achieve the effects of intuitive pattern comparison, comprehensive detection, and simple operation.

Active Publication Date: 2020-05-26
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, each detection technology has defects such as expensive equipment and troublesome operation.

Method used

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  • A Method for Detecting Structural Defects in Composite Materials Using Surface Resonance Visualization Technology
  • A Method for Detecting Structural Defects in Composite Materials Using Surface Resonance Visualization Technology
  • A Method for Detecting Structural Defects in Composite Materials Using Surface Resonance Visualization Technology

Examples

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Comparison scheme
Effect test

Embodiment 1

[0035] A method for detecting structural defects of a carbon fiber reinforced composite material plate using surface resonance visualization technology, the steps are:

[0036] 1. The carbon fiber short fiber reinforced epoxy composite board with a length and width of 40cm×40cm and a thickness of 0.3cm is used as a standard board. Sprinkle the salt particles evenly on the surface, and use the excitation oscillator to vibrate the composite material. When the frequency of 312kHz is applied to resonate, the salt particles form a pattern on the surface of the material. figure 1 As shown, the resonance frequencies of various types of composite materials and the patterns presented at the vibration frequencies were recorded, and a vibration image library was established through simple image processing.

[0037] 2. Take a carbon fiber short fiber reinforced epoxy composite material plate with a defect length and width of 40cm×40cm and a thickness of 0.3cm as the sample to be tested. ...

Embodiment 2

[0039] A method for detecting structural defects of a glass fiber reinforced composite material plate using surface resonance visualization technology, the steps are:

[0040] 1. A glass fiber reinforced composite material board with a length and width of 35cm×35cm and a thickness of 0.3cm is used as a standard board. Sprinkle salt particles evenly on the surface, and use the excitation oscillator to vibrate the composite material. When the frequency of 108kHz is applied, resonance is generated, so that the salt particles form a pattern on the surface of the material, and the resonance frequency and frequency of various composite materials are recorded. The patterns presented at this vibration frequency can be used to establish a vibration image library through simple image processing.

[0041] 2. A glass fiber reinforced composite material plate with a length and width of 35cm×35cm and a thickness of 0.3cm is used as a sample to be tested. The same salt particles are evenly ...

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Abstract

The invention provides a method for detecting the structural defect of a composite material by using a surface resonance visualization technology. The method comprises: uniformly spreading powder particles or a viscous substance on the surface of a standard composite material, and making the standard composite material produce vibration by using excitation oscillation; generating resonance under the action of a certain frequency so as to make the powder particles or the viscous substance form a specific pattern on the surface of the standard composite material; recording the resonance frequency of the standard composite material and the pattern formed at the resonance frequency; uniformly spreading the same powder particles or the same viscous substance on the surface of a composite material to be detected, making the composite material to be detected produce vibration by using excitation oscillation, and recording the pattern produced by the powder particles or the viscous substance on the surface of the composite material to be detected at the resonance frequency; and comparing the two patterns, and judging whether the composite material to be detected has the structural defect.According to the present invention, with the method, the structural defect of the composite material can be rapidly, simply and completely detected, and the method has wide application prospect in thenondestructive material detection field in the future.

Description

technical field [0001] The invention relates to a method for detecting structural defects of composite materials by using surface resonance visualization technology, and belongs to the technical field of nondestructive detection of composite materials. Background technique [0002] In recent years, composite materials have gradually replaced wood and metal alloys due to their light weight, high strength, convenient processing and chemical corrosion resistance, and are widely used in aerospace, automotive, electrical and electronic, construction, fitness equipment and other fields. has developed rapidly. [0003] However, due to the heterogeneity of composite materials, as well as the process instability during manufacturing and the impact and corrosion caused during use, it is prone to defects. Structural testing is extremely important for the quality control of composite materials, and non-destructive testing technology, as an effective means of quality control of composit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04
CPCG01N29/04
Inventor 许福军
Owner DONGHUA UNIV
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