An Ultrasonic Measurement and Inversion Method for the Elastic Constant of a Uniform Substrate Coating
An elastic constant and ultrasonic measurement technology, which is applied in measuring devices, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, and using sound waves/ultrasonic waves/infrasonic waves for material analysis, etc., can solve the problems of difficult non-destructive measurement of elastic constants of coating layers, and achieve The initial value is robust, the inversion precision is high, and the effect of improving accuracy
Active Publication Date: 2021-10-15
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
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[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 the elastic constant of a uniform base coating layer, which belongs to the technical field of ultrasonic nondestructive testing. The ultrasonic measurement and inversion method of the elastic constant of the uniform substrate coating layer measures the geometric size, density and sound velocity of the coating layer and the substrate sample, and uses the ultrasonic water immersion measurement device to collect the refraction information of the longitudinal and transverse waves of the coating layer. The reflection signal, according to Snell's law, combined with the sound velocity to determine the effective angle range of the longitudinal wave and shear wave of the coating layer, and the acoustic time algorithm of the water / coating layer / substrate multi-interface structure is used to calculate the sound velocity of the longitudinal wave and shear wave of the coating layer at different angles, Based on the Christoffel equation, the elastic constants of the coating layer were obtained by inversion with the simulated annealing algorithm. This method solves the problem that the elastic constant of the coating layer with a base is difficult to measure non-destructively, and provides an effective method for the evaluation of the elastic properties of the coating layer and the acquisition of the elastic constant in the modeling and simulation of the coating layer material.
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...
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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