Anisotropic material damage evaluation method based on ultrasonic array bottom surface reflection method

Abstract

The invention discloses an anisotropic material damage evaluation method based on an ultrasonic array bottom surface reflection method, and belongs to the field of material detection and evaluation. The method comprises the following steps: acquiring an anisotropic material sample A scanning signal based on an ultrasonic array bottom surface reflection method; performing continuous wavelet transform on signals corresponding to different array element combinations, reading sound time corresponding to the highest approximation coefficient, calculating longitudinal wave sound velocity under different incident angles, and reading the highest amplitude from the signals; changing a rotation angle in a contact surface of the ultrasonic array and the sample, and obtaining a distribution curve of longitudinal wave sound velocity and maximum amplitude along with the rotation angle; and repeating the steps on the sample at different damage degrees, and establishing the relationship among the longitudinal wave sound velocity, the highest amplitude and the damage degrees under different incident angles and rotation angles. According to the method, the three-dimensional distribution of the longitudinal wave sound velocity and the highest amplitude of the anisotropic material along with the incident angle and the rotation angle can be obtained, the test process is simple, the repeatability is good, and multi-parameter evaluation of the damage degree can be realized.

Description

technical field [0001] The invention relates to an anisotropic material damage evaluation method based on an ultrasonic array bottom surface reflection method, and belongs to the field of high-end equipment detection. Background technique [0002] Anisotropic materials have important applications in many high-end equipment fields. For example, directionally solidified nickel-based superalloys are widely used in aero-engines, and carbon fiber reinforced resin matrix composites (Carbon Fiber Reinforced Plastics, CFRP) are widely used in aerospace fields. Corresponding to the harsh service environment, damage is inevitable. Therefore, if an effective non-destructive evaluation of the damage of materials or components can be carried out, the serious harm caused by the damage in the later stage can be warned in advance, which is of great significance to ensure the bearing performance and service reliability of high-end equipment. [0003] Ultrasound-based NDT evaluation technol...

AI Technical Summary

Problems solved by technology

However, the distribution of the acoustic properties of anisotropic materials in three-dimensional space is relatively complex, and after damage occurs, the three-dimensional spatial distribution is different due to the different forms and degrees of damage.

The existing ultrasonic evaluation method mainly extracts the feature quantity corresponding to a single angle or direction, which is difficult to fully reflect the damage characteristics, the sensitivity is low, and the effect is not ideal

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