Lamination-proof structure of laser shock processing

Abstract

The invention relates to an anti-spallation structure processed by laser shock processing, metal target material is titanium alloy, aluminium alloy or stainless steel; wherein, the back of the metal target material is coated with a protection layer made of a material which has an acoustic resistance close to the acoustic resistance of the metal target material, namely a single-layer or multiple-layer aluminium foil tapes with the thickness between 0.2 and 0.5 millimetres; when spallation occurs in a wave-absorbing layer of a reflection area and the reflection area overlaps on the area to be reinforced next time for 50%, the wave-absorbing layer needs to be changed. The technical proposal of the invention has excellent effects on thin wall structure processed by laser shock processing or parts which have thick sections but are close to the inner wall.

Description

Technical field [0001] The invention is a spall prevention structure for laser shock treatment, belonging to laser processing technology, and relates to a spall prevention measure for laser shock treatment. Background technique [0002] Most engineering materials are more resistant to compression than tensile. They can often withstand considerable compressive stress, but cannot withstand large tensile stress. Therefore, in the laser shock treatment, the intensity of the shock wave must be controlled to obtain plastic strain and residual compressive stress on the front surface of the material, and the strong tensile wave cannot be generated when reflected on the back surface to cause the material to spall. [0003] However, when processing thin-walled structures by laser shock, the attenuation of the shock wave is relatively small during the propagation process. When the pressure wave with a large amplitude propagates to the back of the structure, the reflection of the wave occurs...

AI Technical Summary

Problems solved by technology

[0004] In order to prevent back delamination, the method of back support can be used, but for curved surface structures, it is difficult to have matching solid supports. In addition, for shock waves, the support body and the supported body need to be closely bonded to be effective; liquid is also used. The method of absorbing waves on the back, but because the acoustic impedance of the liquid is quite different from that of the solid material, the reflection coefficient of the shock wave is still very high, so the protection effect is not very good

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