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Ultrasonic guided wave propagation mechanism and detection method of defects in resin-based plywood with sudden change in thickness

A technology of ultrasonic guided wave and detection method, which is applied in the direction of processing the response signal of the detection, and can solve the problems of numerical instability and limitation of the application range of the transfer matrix method, so as to improve the accuracy, suppress the mode conversion effect, and suppress the dispersion of the guided wave effect of effect

Inactive Publication Date: 2011-12-21
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

The most important methods for studying the propagation characteristics of guided waves in laminates are the transfer matrix method and the global matrix method. The transfer matrix method has become the most popular method in the modeling of laminates because of its simplicity, but there is a problem of numerical instability when the product is large in frequency and thickness. problem, which limits the scope of application of the transfer matrix method; and the global matrix method can not be subject to such restrictions, so as to better solve the propagation characteristics of the guided wave in the laminate

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  • Ultrasonic guided wave propagation mechanism and detection method of defects in resin-based plywood with sudden change in thickness
  • Ultrasonic guided wave propagation mechanism and detection method of defects in resin-based plywood with sudden change in thickness
  • Ultrasonic guided wave propagation mechanism and detection method of defects in resin-based plywood with sudden change in thickness

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Embodiment Construction

[0013] The specific embodiment of the present invention is described in detail below:

[0014] Such as figure 1 As shown, the left boundary is the excitation region 1 that excites the guided wave. Set the detection point 2 at the distance from the excitation area d1 to receive the guided wave signal that is directly propagated 4 and reflected by the boundary 5,

[0015] First, the motion equation should be satisfied at any time in the solution time domain 0 a t Calculate the motion state at time t+Δt a t+Δt formula.

[0016] The finite element time-varying difference scheme of ultrasonic guided wave dynamics is:

[0017] a · t + Δt = a · t + ( 1 + γ ) a · ...

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Abstract

The invention relates to an ultrasonic guided wave propagation mechanism and a detection method for defects in a resin-based plywood with a sudden change in thickness. The present invention adopts the finite element method to establish a dynamic finite element model of the resin-based plywood with a sudden change in thickness, and studies the propagation mechanism of the ultrasonic guided wave and the action mechanism between the ultrasonic guided wave and the defect in the resin-based plywood with a sudden change in thickness through the model. , proposed an ultrasonic guided wave inspection method for internal defects of resin-based plywood based on a dynamic finite element model with sudden changes in thickness. The ultrasonic guided wave dynamics finite element model can predict the ultrasonic guided wave signal at any point in the laminate, and the defect reflection echo signal can be extracted from the received signal, so that the size and position of the defect in the resin-based laminate with a sudden change in thickness can be analyzed information. In order to accurately predict the defect signal, the attenuation model of the composite plate is added to the established finite element model, and the optimized guided wave excitation technology is used to suppress the dispersion effect and mode conversion effect of the guided wave, which improves the accuracy of the detection method.

Description

1. Technical field [0001] The invention relates to an ultrasonic guided wave propagation mechanism and a detection method for defects in a resin-based plywood with a sudden change in thickness. 2. Background technology [0002] Composite materials have the advantages of light weight, high specific strength, high specific stiffness, fatigue resistance, designability, etc., which are beneficial to the weight reduction of aviation flight, so they are more and more widely used. The anisotropy of physical properties and severe sound attenuation of resin-based plywood make it different from traditional metal materials in nondestructive testing. How to control the quality of composite materials has become one of the key technologies in the field of nondestructive testing. [0003] The finite element method is an important method in computational mechanics and one of the most encouraging achievements in modern scientific and engineering calculations. As a numerical analysis method ...

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Application Information

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IPC IPC(8): G01N29/44
Inventor 徐春广许寒晖肖定国周世圆赵新玉郝娟孟凡武潘勤学张运涛
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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