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Woven composite material plate damage shape identification method based on ultrasonic guided waves

A composite material plate and ultrasonic guided wave technology, applied in the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, analyze materials, etc., can solve problems such as structural failure

Pending Publication Date: 2022-03-25
DALIAN MARITIME UNIVERSITY +3
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AI Technical Summary

Problems solved by technology

Braided composite structures face complex chemical / physical environment challenges during service, and the occurrence and accumulation of damage may lead to catastrophic failure of the structure, which poses severe challenges to structural safety

Method used

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  • Woven composite material plate damage shape identification method based on ultrasonic guided waves
  • Woven composite material plate damage shape identification method based on ultrasonic guided waves
  • Woven composite material plate damage shape identification method based on ultrasonic guided waves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0071] Example: according to figure 1 The flow shown is for damage identification. The layering method of the T700 12k woven composite board monitored in this example is [0 / 90 / 0 / 90 / 0 / 90], and the specific steps are as follows:

[0072] First, the size of the braided composite board in this embodiment is 450mm×450mm×3mm, and the material parameter is E 1 =56GPa,E 2 =55GPa,E 3 =8.7GPa,G 12 =G 13 =G 23 =4GPa,ν 12 =0.042,ν 23 =0.34, the density is 1577.8kg / m 3 ;

[0073] According to the above parameters, the modal wave velocity of the guided wave propagating on the woven composite board can be obtained by the semi-analytical finite element method, and then the wave velocity of the guided wave propagation at different frequencies can be measured by the omnidirectional wave velocity measurement method. Using the measured wave velocity and the semi-analytic The wave velocity predicted by the finite element method is compared to modify the semi-analytical finite element mod...

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Abstract

The invention discloses a method for identifying a damage shape of a braided composite material plate based on ultrasonic guided waves. The method comprises the following specific steps: S1, analyzing by a semi-analytical finite element method to obtain a guided wave propagation wave velocity on the braided composite material plate; s2, the guided wave propagation wave velocity on the woven composite material plate is measured through an omni-directional wave velocity measurement method, the semi-analytical finite element model is corrected, and a guided wave mode and frequency suitable for monitoring are selected; s3, a guided wave sensor network is arranged on the woven composite material plate, a sensor is pasted on the surface of the structure, and a propagation path is set for damage monitoring; s4, acquiring guided wave signals of different propagation paths in a lossless state and a lossless state, obtaining damage scattering signals of different paths, and determining a damage center point by using an ellipse weighted imaging method; s5, extracting a real damage reflection time difference; s6, estimating damage boundary points based on the elliptical trajectory, and removing noise points; and S7, predicting the damage area and shape according to the damage boundary points.

Description

technical field [0001] The invention relates to the technical field of structural health monitoring, in particular to a method for recognizing damage shapes of braided composite materials based on ultrasonic guided waves. Background technique [0002] Due to the advantages of high strength, dimensional stability, and design flexibility, braided composites are considered as important reinforcement materials and have been applied in engineering fields such as railways, civil and aircraft structures. Braided composite structures face the challenges of complex chemical / physical environments during service, and the occurrence and accumulation of damage may lead to catastrophic failure of the structure, which poses severe challenges to structural safety. To achieve damage tolerance and ensure structural safety, the type, location, size and shape of damage must be precisely identified. In the past decades, structural health monitoring (SHM) has been considered as one of the most p...

Claims

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Application Information

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IPC IPC(8): G01N29/44G01N29/07G01N29/24G01N29/265
CPCG01N29/44G01N29/4472G01N29/07G01N29/2437G01N29/265G01N2291/011G01N2291/0231G01N2291/0289Y02T90/00
Inventor 杨正岩杨雷廖文林马书义邓德双田童徐浩武湛君张浩范兴华
Owner DALIAN MARITIME UNIVERSITY
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