CN-116952755-B - Solid explosive state equation testing device and parameter determining method

CN116952755BCN 116952755 BCN116952755 BCN 116952755BCN-116952755-B

Abstract

The invention relates to the technical field of explosive detonation testing, and particularly discloses a solid explosive state equation testing device and a parameter determining method, wherein the solid explosive state equation testing device comprises a dynamic load loading device, a partition board, a piezoelectric probe and an oscilloscope, and the partition board comprises an aluminum partition board and an organic glass partition board; the dynamic load loading device is connected with the aluminum partition board, the aluminum partition board is connected with the organic glass partition board, a sample to be tested is placed between the aluminum partition board and the organic glass partition board, through holes are formed in the organic glass partition board, the piezoelectric probes penetrate through the through holes of the organic glass partition board and are respectively connected with the lower surface of the aluminum partition board and the lower surface of the sample to be tested, and the oscillograph is connected with the piezoelectric probes. The device greatly reduces the complexity of the device by measuring the shock wave speed in the explosive sample, reduces the measurement error, is convenient for the assembly and implementation of the serialization experiment, and can realize the rapid and reliable determination of the solid explosive state equation parameters.

Inventors

Du Lixiaosong
WANG MENGXIA
BAI XIAOPENG
WANG PENG
WANG SHUAI
PENG PANPAN
WANG QI
LI BIN

Assignees

湖北航天化学技术研究所

Dates

Publication Date: 20260505
Application Date: 20230727

Claims (6)

1. The method for determining the solid explosive state equation parameters is characterized by comprising the following steps of: S101, carrying out shock wave loading to an explosive sample and an organic glass sample test based on a solid explosive state equation testing device so as to obtain the time of voltage signals generated by the shock wave acting on an axis probe, the explosive sample probe and the organic glass sample probe respectively, wherein the solid explosive state equation testing device comprises a dynamic load loading device, a baffle plate, a piezoelectric probe (4) and an oscilloscope (5), and the baffle plate comprises an aluminum baffle plate (21) and an organic glass baffle plate (22); The dynamic load loading device is connected with the aluminum partition board (21), the aluminum partition board (21) is connected with the organic glass partition board (22), a sample to be tested is placed between the aluminum partition board (21) and the organic glass partition board (22), through holes are formed in the organic glass partition board (22), and the piezoelectric probe (4) penetrates through the through holes of the organic glass partition board (22) and is respectively connected with the lower surface of the aluminum partition board (21) and the lower surface of the sample to be tested; S102, calculating to obtain propagation speeds of shock waves in the explosive sample and the organic glass sample based on the time of the shock waves for acting on voltage signals generated by the axis probe, the explosive sample probe and the organic glass sample probe respectively and the height of the explosive sample and the height of the organic glass sample; S103, calculating and obtaining shock wave pressure and particle velocity of the explosive sample and the organic glass sample by a pressure comparison method based on the shock wave propagation velocity in the explosive sample and the organic glass sample; S104, carrying out a sequential aluminum partition plate thickness loading experiment based on the shock wave pressure and the particle velocity of the explosive sample and the organic glass sample, so as to obtain different shock wave velocities of the explosive sample and the organic glass sample; S105, calculating the pressure of shock waves and particle velocity in the explosive sample under different shock wave velocities of the explosive sample and the organic glass sample based on a pressure comparison method; s106, fitting shock wave speed-particle speed equation parameters of the explosive sample by a least square method based on particle speeds of the explosive sample under different shock wave speeds; s107, calculating the shock wave pressure-temperature-specific volume data of the explosive sample based on a shock wave conservation equation and shock wave speed-particle speed equation parameters of the explosive sample; and S108, fitting the shock wave pressure-temperature-specific volume data of the explosive sample into JWL state equation by adopting an intelligent optimization algorithm, so as to obtain the state equation parameters of the explosive sample.
2. The method according to claim 1, wherein the step S101 includes: The method comprises the steps of placing an explosive sample and an organic glass sample between an aluminum partition plate and the organic glass partition plate, generating plane shock waves through a dynamic load loading device, generating loading pressure by the plane shock waves, attenuating the plane shock waves through the aluminum partition plate, and applying the loading pressure to the explosive sample and the organic glass sample, wherein a piezoelectric probe connected with the lower surfaces of the explosive sample, the organic glass sample and the aluminum partition plate is subjected to the action of the plane shock waves to generate voltage signals, and an oscilloscope records the time of the voltage signals generated by an axis probe of the action of the shock waves, the time of the voltage signals generated by the probe of the explosive sample of the action of the shock waves and the time of the voltage signals generated by the probe of the organic glass sample of the action of the shock waves.
3. The method according to claim 1, wherein the propagation velocity of shock waves in the explosive sample in step S102 is calculated by the following formula: (1) In the formula, The propagation velocity of shock waves in the explosive sample; Is the height of the explosive sample; the time of the voltage signal generated for the shock wave to act on the explosive sample probe; The time of the voltage signal generated by the axis probe for the shock wave action; the propagation velocity of the shock wave in the plexiglass sample is calculated by the following formula: (2) In the formula, Is the propagation speed of shock waves in the organic glass sample; Is the organic glass sample height; Time for the shock wave to act on the voltage signal generated by the plexiglass sample probe; the time for the voltage signal generated by the axis probe to act on the shock wave.
4. The method according to claim 1, wherein the pressure contrast method in step S103 is a simultaneous equation set of the shock wave velocity-particle velocity equation of the shock wave, the theoretical momentum conservation equation of the shock wave, the aluminum separator, and the organic glass.
5. The method according to claim 1, wherein the shock wave pressure of the explosive sample in step S107 is calculated by the following formula: (11) In the formula, V 0 and V are the initial specific volume and the compression specific volume of the explosive sample respectively; The slope of the shock wave velocity-particle velocity equation for the explosive sample; Sound velocity for the explosive sample; The impact adiabatic temperature of the explosive sample is calculated by the following formula: (12) In the formula, The temperature of the explosive sample in an impact adiabatic compression state; the temperature of the explosive sample in the initial state; Is a natural constant; the Grunessen coefficient of the explosive sample in the initial state; Specific volume of the explosive sample in the initial state; specific volume of the explosive sample; Specific heat capacity of the explosive sample; is the shock wave pressure of the explosive sample in the shock adiabatic compression state.
6. The method of determining according to claim 1, wherein the JWL equation of state of the explosive sample in step S108 is expressed by the following formula: (14) In the formula, The pressure of the state equation of the explosive sample; the temperature of the explosive sample; is the specific heat capacity of the explosive sample, The relative specific volume of the explosive sample is represented by A s 、B s 、R 1 、R 2 、ω s , which is a constant term of a state equation.

Description

Solid explosive state equation testing device and parameter determining method Technical Field The invention relates to the technical field of explosive detonation testing, in particular to a solid explosive state equation testing device and a parameter determining method. Background The solid explosive is used as a high-energy material and is widely applied to a plurality of fields such as civil blasting, explosion processing, weapon manufacturing and the like, the explosion performance of the solid explosive is of great concern, the main energy release mode of the solid explosive is detonation reaction, and the detonation reaction excitation condition is whether the solid explosive is subjected to instantaneous dynamic load with enough intensity. When explosive medium is subjected to instantaneous dynamic load exceeding the elastic limit, the velocity of backward traveling wave in the medium is higher than that of forward traveling wave, so that discontinuities appear and shock waves are formed, the shock waves propagate in the explosive to cause explosive substances to decompose at high speed, the heat released by decomposition reaction can maintain or even strengthen the propagation of the shock waves, the shock waves are gradually converted into detonation waves to be continuously and stably propagated in the explosive medium along with the continuous decomposition of the substances and the continuous reinforcement of the shock waves, the detonation reaction of the explosive is initiated, if the heat released by the decomposition reaction is insufficient to maintain the propagation of the shock waves, the shock waves gradually attenuate and disappear, the compression deformation and crushing or combustion reaction of the explosive medium are initiated, the propagation of the shock waves can cause the state parameters (temperature, pressure and particle velocity) of the explosive medium to jump before and after the wave fronts, and the state parameter jump directly influences the state change of the shock wave propagation and the detonation reaction of the explosive combustion, and the state parameter change law is closely related to the state equation of the solid explosive itself. The solid explosive state equation is the relation among five state parameters of pressure, temperature, specific volume, particle velocity and shock wave velocity of the explosive medium in an unreacted state, is the basis for researching the mechanism of explosive impact initiation and detonation reaction, has tiny defects such as pores, cracks and bubbles, complicates the structure, has instantaneous and destructive characteristics in explosive detonation reaction, and brings no small difficulty to the research of the solid explosive state equation, so that the solid explosive state equation parameters are determined by adopting a method combining test and theoretical analysis. At present, the dynamic load loading test is combined with the pressure measuring technologies such as a manganese copper pressure meter, a PVDF pressure meter and the like and the speed measuring technologies such as a combined electromagnetic speedometer, a photon Doppler velometer and the like, so that the pressure and particle velocity of the shock wave in explosive media can be measured, and the corresponding shock wave velocity, temperature and internal energy are determined by combining with the theoretical analysis of the shock wave, but the speed measuring technologies have the defects of expensive instruments and complex loading devices and are difficult to widely apply, while the pressure measuring technology loading test (baffle test) has the advantages of simplicity, reliability and low cost, but the pressure measuring technology has a pressure sensor error, so that the uncertainty exists in the shock wave pressure measurement, and in order to reduce the test uncertainty and the device complexity, the dynamic load loading device and the test method used by the technology are required to be improved. Disclosure of Invention Aiming at the problems, the invention improves the existing state equation speed measuring technology, overcomes the defects of the existing explosive detonation testing technology, provides the solid explosive state equation measuring device and the parameter determining method which are wider in applicability, safe, efficient, easy to assemble, accurate and reliable, namely the first aim of the invention is to provide the solid explosive state equation testing device which greatly reduces the complexity of the device, reduces the measuring error, is convenient for sequential experiment assembly implementation and can realize the rapid and reliable determination of the solid explosive state equation parameters by measuring the shock wave speed in an explosive sample. The second object of the invention is to provide a method for determining the state equation parameters of the solid explosive. The first technical sch