Sonoelastic coefficient calibration device for detecting residual stress of explosive through ultrasonic detection method

Abstract

The invention relates to the field of residual stress detection of explosives, and specifically relates to a sonoelastic coefficient calibration device for detecting the residual stress of an explosive through an ultrasonic detection method. The device comprises a digital material testing machine and an ultrasonic stress meter. The digital material testing machine comprises an explosive jaw and atensioning machine clamping tool, wherein the explosive jaw is provided with a fixing groove for clamping an explosive sample, and the shape of the fixing groove is matched with the shape of the explosive sample. A cover plate is arranged on the explosive jaw, and the tensioning machine clamp is connected with a tension machine, and the ultrasonic stress meter comprises a frame. A sliding rail device is mounted on the frame, and an ultrasonic detecting device is fixed on the sliding rail device. The ultrasonic detecting device comprises an ultrasonic probe bracket and an ultrasonic probe, wherein the ultrasonic probe is fixed on the ultrasonic probe bracket, and an elastic member is disposed between the ultrasonic probe brackets. The device can detect the acoustic time difference - load curve of the explosive sample during the loading of a load, and is suitable for the calibration of the sonoelastic coefficient of the explosive sample.

Description

technical field [0001] The invention relates to the field of residual stress detection of explosives, in particular to an acoustoelastic coefficient calibration device for the ultrasonic detection method of residual stress of explosives. Background technique [0002] Polymer Bonded Explosives (PBX for short) is an important class of high-energy explosives composed of high-energy elemental explosives and polymer binders. PBX is formed by hot pressing of molding powder. During the forming process, due to the external pressure, elastic-plastic deformation occurs to varying degrees. After the pressure is removed, a certain amount of elastic strain energy will be accumulated, resulting in residual stress. It can be said that residual stress is a part of PBX explosives. an invisible defect. However, PBX explosives are significantly affected by environmental factors such as temperature and stress during use, and are sensitive to strong external stimuli. Therefore, it is of great t...

AI Technical Summary

Problems solved by technology

In the process of calibrating the acoustoelastic coefficient of explosives, PBX explosives need to be loaded and stretched. The most widely used tensile machine is the universal material testing machine. However, due to the particularity of PBX explosive detection, it is necessary to combine the ultrasonic testing device with the tensile machine. In combination, there is no such detection device on the market

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