Method and system for detecting internal stress ultrasonic longitudinal wave of GIS basin type insulator epoxy test block

Abstract

The invention provides a method for detecting the internal stress ultrasonic longitudinal wave of a GIS basin type insulator epoxy test block. The method comprises: step one, setting an epoxy test block to be in a shape like a cuboid; step two, compressing the epoxy test block and recording a corresponding stress pressure intensity value; step three, acquiring a waveform diagram of an ultrasonic longitudinal wave corresponding to each stress loading through the epoxy test block; step four, calculating an acoustic time difference between an ultrasonic transmitted wave and an ultrasonic receiving wave and acquiring time needed by the ultrasonic longitudinal wave corresponding to each stress loading in the epoxy test block; step five, measuring an ultrasonic sound path and calculating an ultrasonic longitudinal wave propagation velocity in the epoxy test block; step six, drawing an internal stress-ultrasonic longitudinal wave fitting curve to obtain an acoustic elasticity coefficient of the epoxy test block; and step seven, searching an internal stress pressure intensity value caused by mechanical stress loading. According to the invention, with the ultrasonic longitudinal wave soundvelocity, the internal stress pressure intensity value of the GIS basin type insulator epoxy test block can be detected rapidly without destruction.

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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