An ultrasonic longitudinal wave detection method and system for the internal stress of the epoxy test block of the gis pot insulator

Abstract

The invention provides a method for ultrasonic longitudinal wave detection of the internal stress of the epoxy test block of GIS basin type insulators, comprising: (1) setting the epoxy test block as a cuboid; (2) compressing the epoxy test block, and recording the corresponding stress and pressure (3) Obtain the waveform diagram of the ultrasonic longitudinal wave passing through the epoxy test block corresponding to each stress loading; (4) Calculate the acoustic time difference between the ultrasonic transmitting wave and the ultrasonic receiving wave, and obtain the ultrasonic longitudinal wave corresponding to each stress loading (5) measure the ultrasonic sound path, and calculate the ultrasonic longitudinal wave propagation velocity in the epoxy test block; (6) draw the internal stress-ultrasonic longitudinal wave fitting curve to obtain the acoustic elasticity of the epoxy test block coefficient; (7) Find the internal stress pressure value caused by mechanical stress loading. The invention utilizes the sound velocity of the ultrasonic longitudinal wave to quickly and non-destructively detect the internal stress and pressure value of the epoxy test block of the GIS basin type insulator.

Description

technical field [0001] The invention relates to the detection field, in particular to an ultrasonic longitudinal wave detection method and system for internal stress of an epoxy test block of a GIS basin-type insulator. Background technique [0002] Internal stress is the stress that exists in an object in an equilibrium state without external force. At present, the testing methods of internal stress are mainly mechanical measurement method and physical measurement method. Commonly used mechanical determination methods include drilling method, ring core method and indentation method. The physical measurement method to detect internal stress is to use the physical properties of materials to measure its internal stress. At present, there are mainly X-ray method, photoelastic method and ultrasonic method. [0003] The mechanical measurement methods represented by the drilling method and the ring core method will cause damage to the workpiece when detecting internal stress. X...

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Problems solved by technology

[0003] The mechanical measurement method represented by the drilling method and the ring core method will cause damage to the workpiece when detecting internal stress

X-ray diffraction method is a non-destructive stress detection method, but X-ray diffraction method can only be applied to measure the internal stress of crystalline materials, and cannot be measured for typical amorphous materials such as epoxy resin

The photoelastic method is only suitable for transparent photoelastic materials, and epoxy resins are usually doped with a large amount of alumina filler during casting, so the internal stress cannot be measured by the photoelastic method

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