Ultrasonic measurement and inversion method for elastic constant of coating layer with uniform substrate

A technique for measuring elastic constants and ultrasonic waves, which can be used in measuring devices, using sonic/ultrasonic/infrasonic waves to analyze solids, and using sonic/ultrasonic/infrasonic waves for material analysis, etc. The initial value has strong robustness, improves measurement accuracy, and improves the effect of accuracy

Active Publication Date: 2021-02-12
DALIAN UNIV OF TECH
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Problems solved by technology

Using the acoustic-time algorithm of multi-interface structure effectively solves the problem that the elastic constant of the coating layer is difficult to measure non-destructively under the influence of a uniform substrate, and the elastic constant is obtained by inversion with the help of simulated annealing algorithm

Method used

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  • Ultrasonic measurement and inversion method for elastic constant of coating layer with uniform substrate
  • Ultrasonic measurement and inversion method for elastic constant of coating layer with uniform substrate
  • Ultrasonic measurement and inversion method for elastic constant of coating layer with uniform substrate

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Embodiment Construction

[0038] figure 1 A schematic structural diagram of an ultrasonic measurement system for the elastic constant of a uniform substrate coating layer is shown. In the figure, the ultrasonic measurement system for the elastic constant of the uniform base coating layer includes a water tank 1, a back reflector 2, a coating sample 3, an ultrasonic water immersion probe 4, an XYZ three-dimensional stepping device 5, and an ultrasonic flaw detector 6 , rotating angle measuring device 7, GHz sampling frequency oscilloscope 8 and computer 9, the back reflector 2 is located at the bottom of the tank 1, the rotating angle measuring device 7 is located directly above the back reflector 2, and the coating layer sample 3 is fixed on On the rotating angle measuring device 7, the ultrasonic water immersion probe 4 is set directly above the coating layer sample 3, the XYZ three-dimensional stepping device 5 is electrically connected to the ultrasonic water immersion probe 4 and the ultrasonic fla...

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Abstract

The invention discloses an ultrasonic measurement and inversion method for an elastic constant of a coating layer with a uniform substrate, which belongs to the technical field of ultrasonic nondestructive testing. According to the ultrasonic measurement and inversion method for the elastic constant of the coating layer with the uniform substrate, the geometric dimensions, the density and the sound velocity of a sample containing the coating layer and the substrate are measured, and a reflection signal containing longitudinal and transverse wave refraction information of the coating layer is acquired by utilizing an ultrasonic water immersion measurement device; and effective angle ranges of longitudinal waves and transverse waves of the coating layer are determined by combining the soundvelocity, sound velocities of the longitudinal waves and the transverse waves of the coating layer at different angles are calculated by utilizing a sound time algorithm of a water / coating layer / substrate multi-interface structure, and inverting is carried out by virtue of a simulated annealing algorithm on the basis of a Christoffel equation to obtain an elastic constant of the coating layer. According to the method, the problem that the elastic constant of the coating layer with the substrate is difficult to measure in a nondestructive manner is solved, and an effective method is provided for evaluating the elastic performance of the coating layer and acquiring the elastic constant in coating layer material modeling simulation.

Description

technical field [0001] The invention relates to an ultrasonic measurement and inversion method for the elastic constant of a uniform base coating layer, which belongs to the technical field of ultrasonic nondestructive testing and evaluation of materials. Background technique [0002] Coated parts have excellent mechanical, physical and chemical properties, and have been widely used in important industrial fields such as aerospace, petrochemical, and automobile manufacturing. As an important parameter, the elastic properties of the coating layer can effectively evaluate its mechanical properties, and can also provide a reference for the improvement of industrial coating technology. [0003] At present, researchers at home and abroad have developed many measurement methods for the elastic properties of coatings, such as indentation method, tensile method, and bending test method, but these methods are all destructive or micro-damage measurements, and due to The different deg...

Claims

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Application Information

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IPC IPC(8): G01N29/07G01N29/44
CPCG01N29/07G01N29/4436G01N2291/0231
Inventor 林莉孙珞茗马志远雷明凯
Owner DALIAN UNIV OF TECH
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