Method for testing actuating pressure of explosion contact surface of explosive and test device

Abstract

The invention relates to a method for testing actuating pressure of an explosion contact surface of an explosive and a test device. According to the method, the purpose of test on the explosion pressure of the explosive under high temperature and high pressure (dozens of GPa) is achieved. The pressure on the explosion contact surface comprises change of pressure on the contact surface, which is caused by the pressure in an explosive detonation strengthening and attenuating process. Theoretical derivation for measuring the explosion pressure is realized by a higher mathematics calculus relation and value analysis method according to momentum conservation in order to realize measurement of the pressure on the explosion contact surface of the explosive. The test device is designed to comprise an explosion container, a throwing columnar rigid body, a high-speed camera, a data analysis system, a vacuum pump, a safety valve, a container for the throwing columnar rigid body, a detonation device and a scaleplate.

Description

technical field [0001] The invention relates to a method for testing the action pressure of an explosive contact surface and the design of a testing device, especially for realizing high-pressure testing under the condition that direct testing at high temperature and high pressure is relatively difficult at the present stage. Background technique [0002] At present, although there are many methods to test the pressure, no one has proposed a direct test method for the pressure of the explosive explosion and the contact object. The explosive explosion process is high-speed, high-temperature and high-pressure. For example, the detonation pressure of PETN and RDX single-substance explosives can reach 30 according to the different explosive densities. ~50GPa, the explosion temperature can reach 4000K. The detonation pressure of commonly used industrial explosives is generally lower than that of the above simple explosives, but also reaches the order of tens of gigaPascals, while...

AI Technical Summary

Problems solved by technology

At present, researchers measure the shock wave pressure at different distances from the explosion of explosives, and then estimate the detonation pressure through the attenuation law of the shock wave in the air. The attenuation law of the shock wave, and the attenuation law of the shock wave in the air itself is not perfect, so there is a certain error in the method of estimating the detonation pressure, so further using the detonation pressure, the double law and the acoustic similarity to calculate the explosion pressure will also be There is a certain error

At present, researchers have proposed many methods for the detonation pressure test of explosives, including the free surface velocity method, the water tank method, the electromagnetic method and the manganin piezoresistive method in addition to the methods mentioned above, but none of them has given a method. The Method of Accurately Measuring the Pressure of Explosion Action

[0003] 201110116907.0 provides a method for testing the detonation performance of high-energy internal explosives. The method is to install a pressure sensor on the wall of a sealed explosion vessel, and the actual measured pressure is the pressure after the detonation product diffuses. This can be used as a basis for evaluating the performance of explosives, but the detonation pressure of explosives is not measured

[0004] 201210400836.1 provides a high-temperature and high-pressure explosion limit tester, a method and application for determining the explosion limit. This invention is limited to the explosion test of the test gas with a maximum temperature of 400°C and a maximum pressure of 2.2MPa. Obviously, it cannot reach the explosion limit of the test explosive. condition

[0005] 201210369067.3 Provided a multifunctional fine water mist suppression combustible gas explosion test system and test method, which also involves a pressure test, but the test conditions for explosive explosion cannot be realized

[0007] Zhao Jibo, Tan Duowang, Li Jinhe and others from the Shock Wave Physics and Detonation Physics Laboratory of the Institute of Fluid Physics of the Chinese Academy of Engineering Physics have studied the near-field radial pressure of the explosion of cylindrical charges in water, and proposed to use a high-speed scanning camera to record the shock wave The velocity method and the Rankine-Hugoniot relationship are used to calculate the pressure of the near-field shock wave, but this method is only a test of the near-field shock wave

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