Method for measuring longitudinal wave velocity of anisotropic material

Abstract

The invention belongs to the technical field of the nondestructive detection, and relates to improvement of a method for measuring a longitudinal wave velocity of an anisotropic material by adopting an ultrasonic probe. The method is characterized in that a phased-array ultrasonic linear array probe is adopted to measure the longitudinal wave velocity. The method comprises the following steps: acquiring and storing ultrasonic echo data; acquiring a bottom wave propagation time data group of an ultrasonic echo signal; calculating a bottom wave propagation time average value data group; calculating sound wave shortest-path propagation angle data group and a sound wave shortest propagation path data group; calculating a longitudinal wave velocity data group corresponding to each sound wave shortest-path propagation angle; and establishing an analysis function of the longitudinal wave propagation velocity V and the sound wave propagation angle theta. According to the improved method for measuring the longitudinal wave velocity of the anisotropic material, the measurement steps are simplified, the measurement period is shortened, and the measurement precision is improved.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing and relates to the improvement of a method for measuring the sound velocity of longitudinal waves of anisotropic materials by using an ultrasonic probe. Background technique [0002] Ultrasonic testing is to study the reflected, transmitted and scattered waves through the interaction of ultrasonic waves with the tested sample, to measure the geometric characteristics of the sample, to detect macroscopic defects, to detect and characterize changes in tissue structure and mechanical properties, and to further analyze its A technique for evaluating the performance of a specific application. Conventional ultrasonic probes used in ultrasonic testing usually have two types in terms of the number of chips: one contains only one chip, which is used for both transmitting and receiving ultrasonic waves; the other contains a pair of chips, and one chip is used for transmitting Ultrasound, an...

AI Technical Summary

Problems solved by technology

The traditional method of ultrasonic measurement of sound velocity is mostly realized by the reflection method of a single probe or the penetration method of a pair of probes. Due to the sound velocity directionality of anisotropic materials, when measuring the sound velocity at different propagation angles, it is necessary to use a computer-controlled measuring method. The angle of incidence is constantly adjusted by using a horn, and the water temperature is stabilized by means of a water immersion circulating pump. At the same time, due to the influence of mode conversion and reflection / transmission coefficient, the amplitude of the reflected echo signal is relatively low (such as Li Jiawei, Chen Jimao. Nondestructive Testing Handbook [ M]. Beijing: Machinery Industry Press, 2002, p238)

Its disadvantages are: complex measurement steps, long measurement cycle and low measurement accuracy

Images