Method for measuring near field blast wave pressure of underwater explosion of explosive

Abstract

The invention discloses a method for measuring near field blast wave pressure of underwater explosion of an explosive. The measuring method is characterized in that a thin-film stress gauge is glued on cotton cloth by use of an epoxy adhesive, the thin-film stress gauge is welded with a coaxial cable, the other end of the coaxial cable is connected with a charge amplifier, the charge amplifier is connected with a signal wire, and the other end of the signal wire is connected with a data acquisition instrument. The cotton cloth glued with the thin-film stress gauge is put on a test support, a sample is fixed in a position away from the thin-film stress gauge by a certain distance by use of a cotton thread and an enameled wire, a detonator is connected to the sample, the test support is sunk in water, the technical parameters of the data acquisition instrument are set, the test sample is detonated, and the near field output pressure of underwater explosion of the sample is measured. The method can be applied to testing in a small pool; the test process is simple, and the test data can be obtained directly without secondary deduction. The test components are simple and easy to manufacture, and relatively low in cost. The method is capable of measuring the underwater near field blast wave pressure of samples at a hectogram level.

Description

technical field [0001] The invention belongs to the technical field of propellant and explosives, and in particular relates to a method for measuring the near-field shock wave pressure of explosive underwater explosion. The method can measure the near-field shock wave pressure of explosive underwater explosion. Background technique [0002] The near-field shock wave pressure of the explosion has the characteristics of high peak pressure, fast pressure rise frequency, and rapid expansion of the pressure wave front. The impact of the explosion sparse wave on the shock wave pressure and the adiabatic compression of the high-pressure shock wave on water cause the loss of near-field shock wave energy. Huge, resulting in a very fast drop in near-field shock wave pressure, and a very wide range of shock wave pressure. Therefore, in measurement technology, there are high requirements for the response frequency, range, sensitivity and recording rate of the data acquisition recorder of...

AI Technical Summary

Problems solved by technology

[0004] (1) The equipment required for the test cost is expensive, and the test cost is high, which is not conducive to the measurement of the near-field shock wave pressure of a large number of underwater explosions by repeatedly adjusting the formula components and processes and other factors in the initial process of underwater explosive formula design

[0005] (2) The measured pressure is the pressure calculated according to the shock wave velocity in water and the shock Hugo Neo equation of water. There are many links in the test data, and the test accuracy is difficult to guarantee, especially for non-ideal system explosives, the initial stage of detonation, The bubbles formed by the explosion products expand outward together with the shock wave, making it difficult to obtain a clearer path of shock wave propagation in water

[0006] (3) With the development of underwater explosives, the critical size of many new underwater explosives is relatively large at present. Due to the increase in the amount of charge, the above-mentioned optical measurement technology can no longer meet the requirements of the test process for the test charge.

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