A Collinear Mixing Frequency Ultrasonic Detection Method for Mechanical Performance Degradation of Tank Torsion Shaft

Abstract

The invention discloses a collinear frequency mixing ultrasonic detection method for the degradation of the mechanical performance of the tank torsion shaft. A coupling agent is used to bond the longitudinal wave ultrasonic transducer and the transverse wave ultrasonic transducer to both sides of the torsion fatigue test piece of the tank torsion shaft respectively for excitation. Stimulate longitudinal wave and excite shear wave and receive signal wave. Calculate the occurrence time of the mixing wave through theoretical calculation, add the calibrated time window to the mixing wave signal to realize signal discrimination, and eliminate the cause of the torsion shaft test piece of the tank when the parallel section and the non-parallel section are transitioned due to the curved surface at the different shaft diameter The interference of the reflected signal. The mixed wave signal after windowing is processed by the all-phase inversion method, and the phase inversion process is carried out on the all-phase signal of the mixed wave, and the mixed wave signal is further extracted. Finally, the spectrum analysis method is used to process the experimental results after phase inversion processing, and a nonlinear energy parameter of energy distribution in the mixing frequency range is extracted from the frequency domain diagram of the spectrum analysis method.

Description

technical field [0001] The invention belongs to the field of non-destructive detection of metal materials, and in particular relates to a detection system for detecting the degradation of mechanical properties of a tank torsion shaft based on collinear frequency mixing nonlinear ultrasonic waves. Background technique [0002] When the mechanical properties of the materials that make up the structure change, the structural properties will inevitably change. Material performance change is a time-varying process, which can generally be divided into three stages: early performance degradation (including physical and chemical aging and degradation), initiation and accumulation of damage (hole formation and cracking), and fracture failure. For most materials, early performance degradation stages occupy most of their lifetime. The research shows that metal materials under cyclic loading, from the generation of a large number of dislocation groups inside the material to the formati...

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Problems solved by technology

However, at present, the prediction work for the fatigue life of military equipment has not yet been carried out

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