An Ultrasonic Detection Method of Surface Residual Stress Based on Directly Coupled Wave Generation

Abstract

The invention relates to a surface residual stress ultrasonic detection method capable of achieving direct coupling wave generation, and belongs to the technical filed of ultrasonic detection. According to the method, a wave generation mode of coupling agent direct coupling is adopted, ultrasonic waves pass through a single coupling agent medium and directly emit into a measured material, and an adopted direct coupling wave generation ultrasonic probe is in a one-emitting double-receiving stress measurement mode. Firstly, the direct coupling wave generation ultrasonic probe is designed and assembled, the assembled direct coupling wave generation ultrasonic probe is placed on the surface of the measured material, and the measurement cardinal plane is kept in full contact with the surface. A coupling agent is stably injected into a coupling agent cavity from a valve opening, an ultrasonic wave direct spreading passageway is formed, and surface residual stress ultrasonic detection is carried out. According to the method, wave generation and coupling are completed at the same time, fewer ultrasonic wave spreading interfaces exist, the quality of received signals is guaranteed, and the signal to noise ratio is increased. According to the adopted stress measurement mode, transit time difference calculation precision is guaranteed, and the measurement spatial resolution is improved.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic detection, in particular to an ultrasonic detection method of surface residual stress by direct coupling wave generation. Background technique [0002] Residual stress detection has become one of the indispensable links in the manufacturing and service of major equipment. The stress ultrasonic testing method has the advantages of no damage to the tested part, high measurement efficiency, simple device structure, and portable operation. It can meet the urgent needs of on-site environmental testing and has great development potential. [0003] Stress ultrasonic testing based on critically refracted longitudinal waves is the main means to measure and obtain the surface residual stress of parts, among which the construction of highly reliable critically refracted longitudinal waves is the core link, also known as wave-making technology. Conventional wave-making methods mostly use plexiglass wedges...

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Problems solved by technology

[0006] The main problem to be solved by the present invention is to overcome the deficiencies of the existing methods, aiming at the problem that the multi-interface propagation of ultrasonic waves in the conventional wedge wave-making method is easy to cause fast attenuation of sound energy and poor signal-to-noise ratio of acoustic signals, and invents a direct-coupled wave-making method. Ultrasonic testing method for surface residual stress

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