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Method and system for quickly detecting damage to composite material plate

A composite material plate and detection method technology, applied in the direction of analyzing materials, testing of machine/structural components, measuring devices, etc., can solve internal damage of materials, complex mechanical properties and behaviors of composite materials, threats to overall structural safety and normal service, etc. problem, to achieve the effect of good operation performance and strong versatility

Active Publication Date: 2016-07-20
XI AN JIAOTONG UNIV
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Problems solved by technology

In addition, composite materials have complex mechanical properties and behaviors, and are composed of multiple materials. Compared with traditional metal or alloy materials, it is easier to produce internal damage that is not easy to identify under the action of complex environmental factors, including crack initiation, Various mesoscopic damage forms such as interlayer delamination, fiber breakage, and matrix cracking will eventually develop into visible macroscopic damage, directly threatening the safety and normal service of the overall structure

Method used

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  • Method and system for quickly detecting damage to composite material plate
  • Method and system for quickly detecting damage to composite material plate
  • Method and system for quickly detecting damage to composite material plate

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Embodiment Construction

[0031] In one embodiment, a rapid damage detection method for a composite material board is provided. The method includes the following steps:

[0032] S100. Perform a modal test on the composite material plate to obtain the modal shape data, and then obtain the modal shape surface;

[0033] S200. Calculate the two-dimensional generalized local entropy of the modal data points on the modal surface;

[0034] S300: Determine whether there are abnormal data in the two-dimensional generalized local entropy;

[0035] S400. If there is abnormal data in S300, it is judged that the composite material board is damaged; otherwise, it is judged that the composite material board is healthy;

[0036] The two-dimensional generalized local entropy is expressed as follows:

[0037] H ( p ( x i , y j ) ) = - p ( x i , y j ) log 2 p ( x i , y j ) log 2 ( N + 1 )

[0038] Where:

[0039] p(x i ,y j...

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Abstract

The invention relates to a method and a system for quickly detecting damage to a composite material plate. The method comprises the following steps: performing modal test on the composite material plate to acquire modal shape data; calculating a two-dimensional generalized local entropy of the modal shape data; judging whether the two-dimensional generalized local entropy has abnormal data; judging whether the composite material plate is damaged according to a judgment result of the last step. According to the method, quick detection for the damage to the composite material plate is realized, and can be applied to methods conveniently. The method disclosed by the invention has the characteristics of high calculation implementation capacity, simplicity, feasibility and high generality; the shape and the position of the damage can be clearly identified, and the method is suitable for quick and nondestructive detection of structural damage to the composite material plate.

Description

Technical field [0001] The present disclosure relates to structural dynamics non-destructive testing technology, in particular to a rapid damage detection method and system for composite material plates. Background technique [0002] The improvement of the level of science and technology has led to the widespread application of composite materials and the large-scale structure, and gradually changed from non-load-bearing component materials to main load-bearing component materials. In addition, the mechanical properties and behavior of composite materials are complex, and they are composed of a variety of materials. Compared with traditional metal or alloy materials, it is easier to cause internal damage of the material that is not easy to identify under the action of complex environmental factors, including crack initiation, Various forms of mesoscopic damage such as delamination between layers, fiber fracture, and matrix cracking eventually develop into visible macroscopic dama...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01M7/02
CPCG01M7/025G01N33/00G01N33/0003
Inventor 杨志勃陈雪峰田绍华张兴武王诗彬
Owner XI AN JIAOTONG UNIV
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