Partial stiffness method based composite material non-destructive detection system and detection method

A technology of non-destructive testing and composite materials, which is applied in the direction of applying repetitive force/pulsation force to test material strength, analyze materials, measuring devices, etc., and can solve problems such as structure detection of difficult composite materials

Inactive Publication Date: 2012-10-31
PEKING UNIV
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Problems solved by technology

[0003] In order to solve the problem that the traditional nondestructive testing method is difficult to complete the detection of the composite material thin plate structure, a composite material nondestructive testing system and its detection method based on the local stiffness method are established to complete the nondestructive testing of the composite material thin plate structure

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  • Partial stiffness method based composite material non-destructive detection system and detection method
  • Partial stiffness method based composite material non-destructive detection system and detection method
  • Partial stiffness method based composite material non-destructive detection system and detection method

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Embodiment Construction

[0032] The present invention will be further elaborated below through specific embodiments in conjunction with the accompanying drawings.

[0033] Such as figure 1 As shown, the composite nondestructive testing system of the present invention includes: a signal generator 1, a piezoelectric beam 2, a mobile platform 3, a strain gauge 4, a motion control card 5, a data acquisition card 6, and a computer 7; wherein, the signal generator 1 is connected to the piezoelectric beam 2 through a data line; one end of the piezoelectric beam 2 is a free end, and the other end is fixed on the mobile platform 3; the mobile platform 3 is connected to the motion control card 5 through a data line; the motion control card 5 passes the data The cable is connected to the computer 7; the piezoelectric beam 2 is connected to the strain gauge 4 through the data line; the strain gauge 4 is connected to the data acquisition card 6 through the data line; the acquisition card 6 is connected to the comp...

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Abstract

The invention discloses a partial stiffness method based composite material non-destructive detection system and detection method. According to the invention, a partial stiffness method and a technique capable of rapidly acquiring the partial stiffness information of samples to be tested are adopted, the stiffness information of the samples is calculated through tested contact resonance parameters, a stiffness configuration image is formed, and further the material stiffness and health state are evaluated; and from the stiffness detection of the samples to be tested, the internal mechanics information of a structure is characterized through the stiffness information of the samples to be tested. Therefore, the detection method is especially suitable for detection of thin plates of composite materials, and is a brand new non-destructive detection method, wherein the thicknesses of the thin plates are below 5mm. According to the invention, under the premise that the performances and the structure integrity of the materials are not influenced, the testing of stiffness information of the samples to be tested is completed, thus defects and destructive distribution of the structure are estimated.

Description

technical field [0001] The invention belongs to the field of non-destructive testing, and in particular relates to a composite material non-destructive testing system and a testing method based on a local stiffness method. Background technique [0002] Composite materials have the advantages of high specific strength, high specific stiffness, and designability, and have been widely used in many industrial fields. However, the performance of composite materials is severely anisotropic, and has a significant effect on sound wave attenuation; there are many types of defects in composite materials, and the more common defects include cracks, delamination, fractures, and ply wrinkles. Therefore, traditional methods are difficult. Complete the task of non-destructive testing of composite materials. Some detection methods proposed by the non-destructive testing community for the non-destructive testing of composite material structures are mainly based on ultrasonic or microwave de...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32G01N19/00
Inventor 李法新付际周锡龙高鹏
Owner PEKING UNIV
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