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A rapid detection method and system for composite material plate damage

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

Active Publication Date: 2017-09-26
XI AN JIAOTONG UNIV
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  • Claims
  • Application Information

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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

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  • A rapid detection method and system for composite material plate damage
  • A rapid detection method and system for composite material plate damage
  • A rapid detection method and system for composite material plate damage

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Embodiment Construction

[0031] In one embodiment, a method for rapid damage detection of a composite material plate is provided, the method comprising the steps of:

[0032] S100, performing a modal test on the composite material plate, obtaining modal vibration data, and then obtaining a modal vibration surface;

[0033] S200. Calculating the two-dimensional generalized local entropy of the mode shape data points on the mode shape surface;

[0034] S300, judging whether there is abnormal data in the two-dimensional generalized local entropy;

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

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

[0037]

[0038] In the formula:

[0039] p(x i ,y i ) represents the measured point (x i ,y j ) at the entropy value;

[0040] N=2N t +1,N t as the measuring point (x i ,y j ) as the...

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Abstract

The present disclosure relates to a rapid detection method and system for composite material plate damage, which includes the following steps: conducting modal testing on the composite material plate to obtain modal shape data; calculating two-dimensional generalized local entropy of the modal shape data; judging Whether there are abnormal data in the two-dimensional generalized local entropy; judge whether there is damage to the composite plate based on the judgment results of the previous step. Based on the method described, a rapid detection of composite plate damage is achieved for the application of convenient methods. The disclosed method has the characteristics of good computational implementation, simplicity and versatility, can clearly identify the shape and location of damage, and is suitable for rapid non-destructive detection of damage to general composite plate structures.

Description

technical field [0001] The disclosure relates to structural dynamics non-destructive testing technology, in particular to a rapid damage testing method and system for a composite material plate. Background technique [0002] The improvement of the level of science and technology has led to the widespread application of composite materials and the enlargement of structures, and gradually changed from non-load-bearing component materials to main load-bearing component materials. 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 fracture, and matrix cracking eventually develop into visible macroscopic damage, which directly threatens the sa...

Claims

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Application Information

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Patent Type & Authority Patents(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