Short-sonic-path, ultrasonic and non-destructive probe for surface residual stress of large-curvature member

Abstract

The invention relates to a device for the residual stress ultrasonic measurement of a member that is large in curvature and hard in coupled contact. The device comprises an organic glass wedge, a piezoelectric wafer and a sealing cover. A sensor device realizes the function of a pitch-catch structure and the function of a self-transmitting and self-receiving structure via the piezoelectric wafer. The sensor device is characterized by the short-sonic-path propagation of critically refracted longitudinal waves in a to-be-detected member and the detection function of measuring the spacing and detecting longitudinal and transverse residual stresses. The device is novel in design concept and wide in application prospect. Based on the structure of the device, the residual stress detection problem of members large in curvature and hard in coupled contact in the prior art can be well solved.

Description

1. Technical field [0001] The invention designs an ultrasonic detection probe suitable for the residual stress of components with large curvature and difficult coupling contact detection. The device can excite the critical refraction longitudinal wave in a non-contact way through water coupling and propagate in a short sound path in the component to be tested, so as to realize the detection of the residual stress in the small area near the surface of the complex component. It belongs to the field of non-destructive testing. 2. Background technology [0002] Residual stress is the stress retained after deformation due to the uneven stress field, strain field, temperature field and tissue inhomogeneity during metal processing. The existence of residual stress has a great influence on the reliability of mechanical components, especially on the fatigue life, dimensional stability and corrosion resistance of structural parts and can lead to stress concentration, which leads to m...

AI Technical Summary

Problems solved by technology

[0004] Compared with the already approved patent: "Ultrasonic detection and receiving device for residual stress of curved steel plate, application number: CN201110283060", the curvature of the measured curved surface is single, and it does not have the flexibility of measuring residual stress on curved surface components with variable curvature and small areas. On the other hand, its invention does not With the relevant design idea of ​​modern automatic detection, the process of detecting different areas is completed by the movement of the hand, which greatly reduces the detection efficiency

And the movement accuracy is also subject to unavoidable subjective effects

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