Delamination damage imaging method based on interface waves and used for a double-layer metal composite board

Abstract

The invention discloses a delamination damage imaging method based on an interface wave and used for a double-layer metal composite board. The method comprises the following steps: taking a coincidedpart of the metal composite board as an imaging detection region and arranging N measuring points; numbering the N measuring points, sequentially selecting each measuring point to be stimulated to generate a surface wave according to numbers, and enabling the other measuring points to sequentially receive the surface wave and convert the received surface wave into a detection signal; repetitivelyexecuting the steps 1 and 2 until the N measuring points are respectively stimulated to generate the surface waves, receive the surface waves and generate N groups of detection signals; according to anumber sequence of the measuring points, numbering the N groups of detection signals; and based on the N groups of numbered detection signals, drawing an image of damage in the imaging detection region by utilizing an elliptical localization process. The invention also discloses a device used for stimulating the surface waves. The method disclosed by the invention utilizes the characteristics that the interface wave does not result in frequency dispersion when being propagated at a combined part of the metal composite board and energy can be concentrated on an interface, and effectiveness ofdetecting delimitation damage on the interface can be improved.

Description

technical field [0001] The disclosure belongs to the field of non-destructive testing of mechanical structures, and in particular relates to a layered damage imaging method for a double-layer metal composite plate based on interface waves. Background technique [0002] The double-layer metal composite panel is prepared by two different metal materials through bonding, explosive welding, extrusion and other methods, and the metal material layers are closely combined. Compared with homogeneous plates, double-layer metal plates fully combine the performance advantages of the two metal materials, overcome the performance limitations of a single metal material, and are widely used in national defense, aerospace and various civil fields. development trend. [0003] However, during the manufacturing process of double-layer metal composite panels, defects such as cracks, delamination, and inclusions are easily formed on the material bonding surface due to problems such as process o...

AI Technical Summary

Problems solved by technology

These damages may cause performance degradation and even failure of metal composite panels

Because these defects exist on the joint surface, they cannot be observed by naked eyes, and it is difficult to effectively identify them by traditional damage detection methods.

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