Unidirectional stress electromagnetic ultrasonic detection method

Abstract

The invention relates to a unidirectional stress electromagnetic ultrasonic detection method, belongs to the technical field of detection and particularly relates to a unidirectional stress electromagnetic ultrasonic detection system and a detection method. The method comprises the following steps: assembling the electromagnetic ultrasonic detection system, acquiring signal waveforms of an electromagnetic ultrasonic transverse wave probe and an electromagnetic ultrasonic longitudinal wave probe on unidirectional stress detection, and calculating the size of the unidirectional stress through atransverse and longitudinal wave combined detection theoretical formula. In the detection method, the electromagnetic ultrasonic transverse wave probe and the longitudinal wave probe are used for exciting the ultrasonic transverse wave and the ultrasonic longitudinal wave to perform combined detection on the unidirectional stress, the external electromagnetic interference can be shielded, and thesignal-to-noise ratio is high. The defect that the influence on the stress detection by bolt deformation is not considered by the traditional single waveform is overcome, combined detection on the unidirectional stress by the electromagnetic ultrasonic transverse and longitudinal probes is realized, the influence on detection by axial tensile deformation can be eliminated, and the detection precision is high.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a unidirectional stress electromagnetic ultrasonic detection system and detection method. Background technique [0002] The stress state of key components or structures in equipment is the core parameter that affects its service performance. In particular, unidirectional stress often exists in parts such as bolts and shafts, which affects preload reliability and structural dimensional stability, thus affecting the mechanical properties and service life of the complete equipment and functional components. Therefore, it is necessary to detect and evaluate the level of unidirectional stress of the workpiece. Traditionally, piezoelectric ultrasonic probes are often used to excite ultrasonic longitudinal waves or transverse waves to detect the unidirectional stress of workpieces. These methods require couplant and contact with the surface of the workpiece, and its surf...

AI Technical Summary

Problems solved by technology

[0006] The main technical problem to be solved by the present invention is to overcome the deficiencies of the existing devices and methods. Aiming at the many problems existing in the ultrasonic method currently used for unidirectional stress detection, a unidirectional stress electromagnetic ultrasonic detection system and detection method are invented.

Images