Electromagnetic loading based online measurement system for acoustoelasticity coefficient of metal plate

Abstract

The invention relates to an electromagnetic loading based online measurement system for an acoustoelasticity coefficient of a metal plate. The online measurement system is characterized by comprising a single chip microcomputer, a pulse signal generator, an ultrasonic emitting head, an ultrasonic receiving head, an oscilloscope, an adjustable voltage-stabilized power supply, an energy-storage capacitor, controllable silicon and four loading heads, wherein an output end of the pulse signal generator is connected with the ultrasonic emitting head; the ultrasonic emitting head emits ultrasonic waves to a to-be-measured piece; the ultrasonic waves are transmitted to the ultrasonic receiving head through the to-be-measured piece; the ultrasonic receiving head is connected with the oscilloscope; the single chip microcomputer is connected with control ports of the pulse signal generator and controllable silicon; an output end of the adjustable voltage-stabilized power supply is connected with the energy-storage capacitor, controllable silicon and the four loading heads sequentially; the four loading heads are of the same structure, two loading heads constitute one group, and each group is of a vertically symmetrical structure to be arranged on the upper surface and the lower surface of the to-be-loaded metal plate; each loading head comprises an exciting coil and a permanent magnet.

Description

technical field [0001] The invention belongs to the technical field of nondestructive testing, and in particular relates to an online measurement system for the acoustic elastic coefficient of a metal plate based on electromagnetic loading. Background technique [0002] Under the influence of stress factors, metal parts will have defects or even break, causing serious consequences. Therefore, the study and detection of stress in metal materials is of great significance to production and scientific experiments. The ultrasonic method is considered to be one of the most promising methods in stress testing due to its many advantages, but the elastic coefficient of the material to be tested must be obtained in advance when using the generation method. The existing method is to stretch the standard test piece in the laboratory using a material testing machine to obtain the acoustoelastic coefficient of the material, but the difference between the working environment of the tested...

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Problems solved by technology

The ultrasonic method is considered to be one of the most promising methods in stress detection due to its many advantages, but the use of the generation method must obtain the elastic coefficient of the material to be tested in advance

The existing method is to stretch the standard test piece in the laboratory using a material testing machine to obtain the acoustoelastic coefficient of the material, but the difference between the working environment of the tested workpiece and the laboratory environment will make the actual acoustoelastic coefficient of the material Differences with laboratory data lead to errors in stress test results

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