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Second harmonic detection method for early damage of periodic composite material

A composite material, second harmonic technology, applied in the analysis of materials, the use of sonic/ultrasonic/infrasonic waves to analyze solids, and the use of sonic/ultrasonic/infrasonic waves for material analysis, etc., to achieve sustainable accumulation, reliable technical solutions, and ensure the use of safe effect

Active Publication Date: 2022-05-10
CHONGQING IND POLYTECHNIC COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the research on second harmonic detection technology has become mature, its research results are mainly applied to thin plates of the same homogeneous material. At present, there is no flaw detection method for composite materials that are periodically distributed by two materials.

Method used

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  • Second harmonic detection method for early damage of periodic composite material
  • Second harmonic detection method for early damage of periodic composite material
  • Second harmonic detection method for early damage of periodic composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Introduction to the principle of material quasi-phase matching technology:

[0032] The present invention is based on the basic principle proposed by the inventor for the first time in this patent, which the inventor calls: Material Quasi-Phase Matching Technical Principle, referred to as MQPM. Before introducing the embodiments, the material quasi-phase matching technology will be introduced first.

[0033] For the second harmonic of nonlinear Lamb wave, consider the reasonable and special spatial distribution of nonlinear coefficients to overcome the limitation of phase-velocity matching conditions, so that the second harmonic excited by any fundamental frequency can get rid of the effect of its periodic oscillation Constraints, and then realize the continuous accumulation of the second harmonic of the nonlinear Lamb wave, and realize the material quasi-phase-matching technique (MQPM) of the second harmonic of the nonlinear Lamb wave.

[0034] According to the litera...

Embodiment 2

[0078] The difference between this embodiment and Embodiment 1 is that the ultrasonic probe in this embodiment (mainly referring to the receiving point) includes: a housing 1, a CMUT sheet 4, an acoustic lens 3 and a controller; the CMUT sheet 4 includes multiple a CMUT element; the acoustic lens 3 is located on the surface of the CMUT sheet 4; the bottom surface of the CMUT sheet 4 is provided with a liner layer 7, the liner layer 7 is bonded to the CMUT sheet 4, and the liner layer 7 and the acoustic lens 3 are respectively Located at the top and bottom of the CMUT sheet 4; the CMUT sheet 4 is connected to the flexible substrate 2 through a wire; the flexible substrate 2 is electrically connected to the controller (the flexible substrate 2 is also connected to the controller with an external power lamp and other equipment); the housing 1 is provided with a piezoelectric ceramic sheet 5, and the piezoelectric ceramic sheet 5 is provided with an electrode 6 with opposite polari...

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Abstract

The invention belongs to the field of composite material early-stage damage detection, and particularly relates to a periodic composite material early-stage damage second harmonic detection method, which comprises the following steps: S1, composite material parameter acquisition: the specific parameters comprise composite material change distribution period wavelength and thickness h; s2, fundamental wave parameters are determined, and corresponding fundamental wave frequencies are selected according to the composite material parameters; the change distribution period wavelength of the composite material is the same as the cumulative change period distance Ln of the second harmonic excited by the corresponding frequency in the flat plate with the same thickness; s3, flaw detection; s4, performing damage analysis. According to the scheme, the limitation of the traditional secondary harmonic detection phase velocity matching condition is broken through, the detected fundamental frequency is selected according to the period of the composite material, the secondary harmonic can be continuously accumulated without attenuation, and a reliable technical scheme is provided for early damage secondary harmonic detection of the composite material in which two materials are periodically distributed.

Description

technical field [0001] The invention belongs to the field of early damage detection of composite materials, and in particular relates to a second harmonic detection method for early damage of periodic composite materials. Background technique [0002] The plate and shell structure has excellent performance and is widely used in all walks of life. These plate and shell structural materials will be more or less affected by stress, high temperature, high pressure and corrosion during use, and are very prone to damage such as fatigue, plasticity, corrosion and creep, which will gradually degrade the performance of the plate and cause an explosion. Safety accidents such as breakage, breakage and leakage of hazardous substances threaten the operation of equipment and the safety of personnel's lives and property, causing major social and economic losses. Therefore, it is a very important research topic in our country's national economic production and life to study powerful non-de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/24G01N29/44
CPCG01N29/04G01N29/245G01N29/4472G01N2291/023Y02E30/30
Inventor 孙晓强杨茹兰
Owner CHONGQING IND POLYTECHNIC COLLEGE
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