Magnetostrictive guide wave damage-free detection method

Abstract

The utility model relates to a non-destructive examination method for the magnetostriction guided wave, which belongs to the technical field of non-destructive examination; wherein, a group of signals are extracted respectively from the zero defects signals of standard samples and the actual detection signals as reference signals and detection signals according to definite length and starting point of the data. The method one is that: a group of signals are acquired via the difference between the detection signals and the reference signals; defects are detected by judging whether the signals are deformed or not; the loss amounts of the section surface of tested members are measured by using the peak-to-peak value of the signals according to the linear relationship between the peak-to-peak value of the defect signals and the loss amounts of the section surface of the tested members. The method two is that: a group of signals are acquired via the difference between the square of the detection signals and the reference signals; defects are examined by judging whether the signals are deformed or not. The originally indistinguishable signals of small defects are processed into signals with easily distinguishable defects through the signal processing method, thus realizing the examination of minor defects defying examination and greatly enhancing the precision of measurement.

Description

technical field [0001] The invention belongs to the technical field of nondestructive testing, and in particular relates to a nondestructive testing method for magnetostrictive guided waves. Background technique [0002] Ultrasonic guided wave technology has the advantages of single-point excitation and can detect a certain distance. It has been widely used in the industry in recent years. For example, the invention patent application with application number 200310123047.9 discloses a non-destructive inspection device using guided Invention inspection method (disclosure date is February 2, 2005); application number is 200610072881.3 invention patent application discloses a method for guided wave detection of liquid-filled pipeline with viscoelastic coating (disclosure date is September 6, 2006 No.); the invention patent application with application number 200610144294.0 discloses an ultrasonic guided wave time-reversal detection device and method for pipeline defects (public...

AI Technical Summary

Problems solved by technology

The above technologies are mainly carried out around piezoelectric ultrasonic guided waves, mainly focusing on how to obtain guided waves with a single mode

Since the magnetostrictive guided wave is difficult to obtain a simple mode guided wave, resulting in low detection accuracy, the signal processing method based on the piezoelectric guided wave is difficult to apply to the magnetostrictive guided wave signal processing

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