Method for estimating thermal-friction coupling sensitivity of explosives and powders

Abstract

The invention discloses a thermal-friction coupling sensitivity estimation method for explosives and powders. The method comprises the following steps: determining the explosion probability of an explosive and powder sample according to actual demands; determining the amount of the tested explosive and powder sample, and measuring the thermal-friction coupling sensitivity of the explosive and powder sample at a certain temperature; obtaining thermal-friction coupling sensitivities of the explosive and powder samples at at least four temperatures, and respectively recording numerical values of the corresponding temperatures and friction sensitivities; analyzing an influence rule of the temperature and the friction sensitivity on the thermal-friction coupling sensitivity of the explosive and powder samples, and constructing a thermal-friction coupling sensitivity model; and analyzing and estimating the thermal-friction coupling sensitivity of the explosive and powder samples. And the thermal-friction coupling sensitivity of the explosives and powders in a certain temperature range can be estimated, and the method has the advantages of high efficiency, economy, safety and the like, and has certain reference significance for the safety of an explosive and powder production process.

Description

Technical Field

[0001] The invention belongs to the research field of safe application of explosives and firearms, relates to research on thermal-mechanical coupling response performance of explosives and firearms, and in particular to a method for estimating thermal-friction coupling sensitivity of explosives and firearms. Background Art

[0002] During the production and use of explosives, they will inevitably be subject to a variety of external stimuli and coupled stimuli. In particular, in typical processes such as melting, screw pressing, and pouring of high-energy and high-activity new materials, explosives and their materials will be subject to coupled stimulation of heat and friction and be in an environment of multiple external fields such as temperature field and force field. When the heat-friction coupling sensitivity is unclear, it is difficult to determine safe process conditions. There are high unknown risks in the preparation process of explosives and materials. When the safety threshold of explosives and materials is exceeded, it is easy to cause accidental decomposition, leading to combustion and explosion accidents. Therefore, the heat-friction coupling sensitivity of explosives and materials is the core basic supporting parameter for process safety.

[0003] At present, there are several problems in the thermal-friction coupling sensitivity test and analysis process of explosives and their materials: (1) The existing test method usually adopts the method of heating the sample to the target temperature and then transferring it to the friction sensitivity meter for sensitivity test. Due to the long heating time, the structure and composition of the sample will undergo significant changes, and it is impossible to obtain accurate test results. (2) The test cost of thermal-friction coupling sensitivity is high, time-consuming, and the test results are greatly affected by the ambient temperature and humidity. In the process of obtaining a set of valid data, it is easy to cause inaccurate test results due to the inability to ensure environmental consistency, which in turn leads to misjudgment. Summary of the invention

[0004] In order to solve the technical problem that the existing method has a long testing process, resulting in significant changes in environmental consistency, sample structure composition, etc., which causes deviations in test results and leads to misjudgment, the purpose of the present invention is to provide a method for estimating the thermal-friction coupling sensitivity of explosives.

[0005] In order to achieve the above tasks, the present invention adopts the following technical solutions:

[0006] A method for estimating thermal-friction coupling sensitivity of explosives, characterized by following the steps:

[0007] Step 1: Determine the explosion probability of the explosive sample according to actual needs;

[0008] Step 2: Determine the amount of the explosive sample to be tested, and measure the thermal-friction coupling sensitivity of the explosive sample at a certain temperature. The specific method is: use a thermal-friction coupling sensitivity test device, and use its characteristics of simultaneously controllable loading of temperature and friction load to obtain the thermal-friction coupling sensitivity of the explosive sample under the explosion probability specified in step 1, and record the corresponding temperature and friction sensitivity values;

[0009] Step 3: Repeat step 2 to obtain the thermal-friction coupling sensitivity of the ignition explosive sample at at least 4 temperatures, and record the corresponding temperature and friction sensitivity values ​​respectively;

[0010] Step 4: Analyze the influence of temperature and friction sensitivity on the thermal-friction coupling sensitivity of explosive samples, and construct a thermal-friction coupling sensitivity model. The specific method is:

[0011] According to the results obtained in step 3, a graph is drawn with temperature or the reciprocal of temperature as the horizontal axis and friction sensitivity or the logarithm of friction sensitivity as the vertical axis to obtain a heat-friction coupling sensitivity relationship diagram under the explosion probability specified in step 1, and a curve fitting is performed on it. When the correlation coefficient r 2 When >0.95, the fitting curve is accepted and the corresponding thermal-friction coupling sensitivity model is recorded;

[0012] Step 5: Analysis and estimation of thermal-friction coupling sensitivity of explosive samples

[0013] According to the fitting curve and the thermal-friction coupling sensitivity model in step 4, the friction sensitivity of the explosive sample at a given temperature is calculated in the range of (lowest test temperature -10)K to (highest test temperature +10)K, and the corresponding thermal-friction coupling sensitivity can be estimated.

[0014] According to the present invention, the thermal-friction coupling sensitivity model has a linear relationship, a logarithmic relationship or an exponential relationship.

[0015] The method for estimating the thermal-friction coupling sensitivity of explosives of the present invention has the following beneficial effects:

[0016] (1) It avoids the problem that the conventional method has a long testing process, which leads to significant changes in environmental temperature and humidity, sample structure and composition, resulting in deviations in test results.

[0017] (2) This method can be used to estimate the thermal-friction coupling sensitivity of explosives within a certain temperature range. It has the advantages of high efficiency, economy, and safety, and has certain reference significance for the safety of explosives production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the fitting curve and model of the thermal-friction coupling sensitivity of CL-20 of a certain particle size.

[0019] Figure 2 This is a schematic diagram of the heating unit of the thermal-friction coupling sensitivity test device. The symbols therein represent: 1. Ceramic rod, 2. Calibration temperature sensor, 3. Temperature control sensor, 4. Heating plate, 5. Ceramic plate.

[0020] Figure 3 This is a port diagram of a temperature controller and a solid-state relay of a thermal-friction coupling sensitivity test device.

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0022] It should be noted that in the following embodiments, the thermal-friction coupling sensitivity test device is designed by the applicant to analyze the thermal-friction coupling sensitivity test of explosives. Based on the existing BAM friction sensitivity meter, it is equipped with a heating unit consisting of a ceramic rod 1, a calibration temperature sensor 2, a temperature control sensor 3 and a heating plate 4. The temperature control sensor 3 and the calibration temperature sensor 2 form a temperature feedback correction structure to calibrate the temperature difference between the explosive sample and the heating plate 4 and control the temperature revision, thereby achieving rapid heating of the explosive sample. See the schematic diagram of the heating unit of the thermal-friction coupling sensitivity test device for details. Figure 2 As shown. It has been used as a test auxiliary equipment in the test and analysis of the thermal-friction coupling sensitivity of explosives. And applied for a Chinese national defense patent (patent application number: 202218015264.X).

[0023] The heating plate 4 is composed of a ceramic plate 5 with a built-in tungsten wire, and silver is plated on the surface of the ceramic plate 5 by an immersion method. The power range is 30 to 100 W, and it is powered by 24 VDC. The heating plate 4 has two connection ends, one of which is connected to the 2nd port of the solid-state relay, and the other end is connected to the power supply 24 VDC. During the experiment, the power is turned on and off by quickly opening and closing the solid-state relay to achieve the purpose of heating and stopping heating.

[0024] The temperature control sensor 3 and the correction temperature sensor 2 form a temperature feedback correction structure for temperature difference calibration and control temperature revision.

[0025] The temperature control sensor 3 is a patch type platinum resistance temperature sensor, which is attached to one end of the heating plate 4 with a high temperature resistant adhesive to obtain the temperature data of the heating plate 4 .

[0026] The port diagram of the temperature controller and solid-state relay of the thermal-friction coupling sensitivity test device is shown in Figure 3 The temperature control sensor 3 is connected to the T1, S1, and R1 ports of the temperature controller. The temperature measurement range is 5 to 250°C, and the temperature measurement accuracy is ±0.1°C.

[0027] The calibration temperature sensor 2 is a SMD platinum resistance temperature sensor. During the experiment, the SMD platinum resistance temperature sensor can obtain the temperature data of the surface of the ceramic plate 5 (i.e. the temperature data of the sample explosive). The calibration temperature sensor 2 is connected to the T1, S2 and R2 ports of the temperature controller. The temperature measurement range is 5 to 250°C, and the temperature measurement accuracy is ±0.1°C.

[0028] The applicant uses the above-mentioned thermal-friction coupling sensitivity test device to determine the thermal-friction coupling sensitivity of explosives and materials, and analyzes and estimates the thermal-friction coupling sensitivity by building a model, thereby realizing a method for estimating the thermal-friction coupling sensitivity of explosives, which is specifically carried out in the following steps:

[0029] Step 1: Determine the explosion probability of the explosive sample according to actual needs;

[0030] Step 2: determine the amount of test samples, and measure the thermal-friction coupling sensitivity of the explosive sample at a certain temperature; the specific method is: using a thermal-friction coupling sensitivity test device, using its temperature and friction load controllable loading characteristics, to obtain the thermal-friction coupling sensitivity of the explosive sample under the explosion probability specified in step 1, and record the corresponding temperature and friction sensitivity values;

[0031] Step 3: Repeat step 2 to obtain the thermal-friction coupling sensitivity of the ignition explosive sample at at least 4 temperatures, and record the corresponding temperature and friction sensitivity values ​​respectively;

[0032] Step 4: Analyze the influence of temperature and friction sensitivity on the thermal-friction coupling sensitivity of explosive samples, and construct a thermal-friction coupling sensitivity model. The specific method is:

[0033] According to the results obtained in step 3, a graph is drawn with temperature or the reciprocal of temperature as the horizontal axis and friction sensitivity or the logarithm of friction sensitivity as the vertical axis to obtain a heat-friction coupling sensitivity relationship diagram under the explosion probability specified in step 1, and a curve fitting is performed on it. When the correlation coefficient r 2 When >0.95, the fitting curve is accepted and the corresponding thermal-friction coupling sensitivity model is recorded. The thermal-friction coupling sensitivity model exists in the form of linear relationship, logarithmic relationship or exponential relationship;

[0034] Step 5: Analysis and estimation of thermal-friction coupling sensitivity of explosive samples

[0035] According to the fitting curve and the thermal-friction coupling sensitivity model in step 4, the friction sensitivity of the explosive sample at a given temperature is calculated in the range of (lowest test temperature -10)K to (highest test temperature +10)K, and the corresponding thermal-friction coupling sensitivity can be estimated.

[0036] The following are specific embodiments given by the inventors. It should be noted that, in the following embodiments, the thermal-friction coupling sensitivity model has a linear relationship, a logarithmic relationship or an exponential relationship.

[0037] Embodiment 1:

[0038] The estimation of the thermal-friction coupling sensitivity of CL-20 of a certain particle size is taken as an example for specific explanation.

[0039] First, determine that the explosion probability of CL-20 of a certain particle size is 1 / 6.

[0040] Determine the test sample size to be 10mm 3 , using the thermal-friction coupling sensitivity test device, the thermal-friction coupling sensitivity of CL-20 of a certain particle size under 4 groups of 1 / 6 explosion probability was measured, and the corresponding temperature and friction sensitivity were recorded, as shown in Table 1.

[0041] Table 1: CL-20 thermal-friction coupling sensitivity of a certain particle size under 1 / 6 explosion probability

[0042]

[0043] According to the data in Table 1, it is found that when the temperature rises, the friction sensitivity value of a certain particle size CL-20 decreases. With the inverse of temperature as the horizontal axis and the logarithm of friction sensitivity as the vertical axis, a heat-friction coupling sensitivity relationship diagram of a certain particle size CL-20 under a 1 / 6 explosion probability is obtained, that is, a relationship diagram between the logarithm of friction sensitivity and the inverse of temperature, as shown in Figure 1 As shown, a curve fitting is performed on it, and the correlation coefficient r 2 =0.9920>0.95, accept the fitting curve, and record the corresponding thermal-friction coupling sensitivity model as:

[0044] y=671.84x+2.1821 (1)

[0045] Where: x is the reciprocal of temperature, unit is K -1 ; y is the logarithm of friction sensitivity, unit is ln(N).

[0046] According to formula (1), the thermal-friction coupling sensitivity of a certain particle size CL-20 in the range of 278K to 383K (i.e., 15°C to 110°C) can be predicted. For example, at 333K (i.e., 60°C), the thermal-friction coupling sensitivity of a certain particle size CL-20 is about 67N.

Claims

1. A method for estimating thermal-friction coupling sensitivity of explosives, characterized in that: Follow these steps: Step 1: Determine the explosion probability of the explosive sample according to actual needs; Step 2: Determine the amount of explosive sample to be tested and measure the thermal-friction coupling sensitivity of the explosive sample at a certain temperature; The specific method is: using a thermal-friction coupling sensitivity test device, using its characteristics of simultaneously controllable loading of temperature and friction load, to obtain the thermal-friction coupling sensitivity of the explosive sample under the explosion probability specified in step 1, and record the corresponding temperature and friction sensitivity values; Step 3: Repeat step 2 to obtain the thermal-friction coupling sensitivity of the ignition explosive sample at at least 4 temperatures, and record the corresponding temperature and friction sensitivity values ​​respectively; Step 4: Analyze the influence of temperature and friction sensitivity on the thermal-friction coupling sensitivity of explosive samples, and construct a thermal-friction coupling sensitivity model. The specific method is: According to the results obtained in step 3, a graph is drawn with temperature or the reciprocal of temperature as the horizontal axis and friction sensitivity or the logarithm of friction sensitivity as the vertical axis to obtain a heat-friction coupling sensitivity relationship diagram under the explosion probability specified in step 1, and a curve fitting is performed on it. When the correlation coefficient r 2 When >0.95, the fitting curve is accepted and the corresponding thermal-friction coupling sensitivity model is recorded. The thermal-friction coupling sensitivity model exists in the form of linear relationship, logarithmic relationship or exponential relationship; Step 5: Analysis and estimation of thermal-friction coupling sensitivity of explosive samples According to the fitting curve and the thermal-friction coupling sensitivity model in step 4, the friction sensitivity of the explosive sample at a given temperature is calculated in the range of (lowest test temperature -10)K to (highest test temperature +10)K, and the corresponding thermal-friction coupling sensitivity can be estimated.

2. The method according to claim 1, characterized in that The thermal-friction coupling sensitivity model has a linear relationship, a logarithmic relationship or an exponential relationship.

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