A simulation material for mechanical testing of press-loaded explosives

Abstract

This invention proposes a simulation material for mechanical testing of press-loaded explosives, which, by weight, is made from the following raw materials: 65.5% ammonium sulfate, 27%–33% aluminum powder, 1.5%–4% microcrystalline wax, 1%–2% butadiene rubber, and 0.2%–0.8% graphite. The compressive and tensile strengths of the explosive charge formed by this simulation material are essentially consistent with those of the charge charge formed from polyaluminum black-2 (JHL-2) explosive. It can realistically reflect the trend and limit of strength changes during mechanical testing, and provides effective reference data for mechanical performance evaluation. It also provides relatively realistic and reasonable model parameters for the digital design of the mechanical properties of press-loaded explosives. In aging tests, tensile tests, mechanical compression tests, and dynamic Brazilian tests, using this simulation material avoids contact with energetic explosive components, increasing test safety and reducing safety hazards.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of simulation materials for press-packed explosive mechanics test, mainly suitable for press-packed explosive mechanics test such as aging mechanical property evaluation, storage period evaluation and structural integrity test. BACKGROUND

[0002] In the process of press-packed explosive aging, structural integrity test, a simulation material with mechanical property parameters basically consistent with real press-packed explosive is needed to carry out related tests, verify the generation process of structural defects and analyze its mechanism.For example, the Chinese patent "a kind of simulation material for polymer-based cast explosive process test" with application publication number CN110470521A discloses a simulation material using cast process, which simulates the density and process viscosity of real cast explosive, and is mainly used in the process test of polymer-based cast explosive.The Chinese patent "a kind of simulation material for cast explosive process test" with application publication number CN112048188A discloses a simulation material using cast process, which simulates the rheological properties and mechanical properties of real cast explosive, and is mainly used in the process test of polymer-based cast explosive.Cast explosive and press-packed explosive have great difference in preparation process, and the above two patents do not involve press-packed explosive and the simulation of mechanical properties of press-packed explosive. SUMMARY

[0003] In view of the deficiencies in the prior art, the present application aims to provide a kind of simulation material for press-packed explosive mechanics test, to solve the technical problems of large sample size in the prior art, which leads to great safety hazards.

[0004] To solve the above technical problems, the present application adopts the following technical solutions:

[0005] A kind of simulation material for press-packed explosive mechanics test, made of the following raw materials in parts by weight: 65.5% ammonium sulfate, 27% aluminum powder, ～ 33% aluminum powder, 1.5% ～ 4% microcrystalline wax, 1% ～ 2% butadiene rubber, 0.2% ～ 0.8% graphite.

[0006] The preferred scheme of the present application is made of the following raw materials in parts by weight: 65.5% ammonium sulfate, 30% aluminum powder, 3% microcrystalline wax, 1.2% butadiene rubber, 0.3% graphite.

[0007] The present application also has the following technical features:

[0008] The aluminum powder is flaky aluminum powder or spherical aluminum powder.

[0009] The preparation process of the simulated material for the mechanical test of the pressed explosive is as follows: ammonium sulfate and an ethanol solvent are added into a kneading pot for infiltration and mixing, then dissolved microcrystalline wax solution and butadiene rubber solution are added for mixing, finally aluminum powder and graphite are added for uniform kneading, and molding powder is obtained through a granulator.

[0010] The pressing process of the simulated material for the mechanical test of the pressed explosive is as follows: a mold is selected according to the size of the explosive column, the mass of the molding powder is weighed according to the molding density of the explosive column, the molding powder is poured into the mold, the pressing pressure and the pressure holding time are set for pressing, and after completion, demolding and trimming are performed to obtain the molded explosive column.

[0011] The pressing pressure is 120MPa-210MPa.

[0012] The mold has a diameter of 20mm and a height of 20mm.

[0013] The molding density of the explosive column is 1.8g / cm 3 .

[0014] The pressure holding time is 3min.

[0015] The tensile strength of the explosive column ranges from 0.5MPa to 0.8MPa.

[0016] Compared with the prior art, the present application has the following technical effects:

[0017] (I) The compressive strength and tensile strength of the explosive column pressed by the simulated material for the mechanical test of the pressed explosive are basically the same as those of the explosive column pressed by JHL-2, which can truly reflect the change trend and limit of the strength in the mechanical test process, and provide effective reference data for the mechanical performance evaluation and more realistic and reasonable model parameters for the digital design of the mechanical performance of the pressed explosive.

[0018] (II) The simulated material for the mechanical test of the pressed explosive has simple components, simple preparation process, short molding cycle, and can be reused, which improves the work efficiency and reduces the material cost. DETAILED DESCRIPTION

[0019] It should be noted that all raw materials in the present application, unless otherwise specified, are all known raw materials in the prior art.

[0020] The concept of the present application is:

[0021] Due to high solid content, high charge density and great power, pressed explosive has been widely used in warhead charge of various weapons. In the fields of service period evaluation, life extension, failure cause, manufacturing and weapon development, mechanical property test is needed, so a simulated material for mechanical test of pressed explosive is needed to simulate the mechanical characteristics of real pressed explosive and reduce the risk in manufacturing, storage, transportation and research process.

[0022] In the design of simulated formula for pressed explosive, raw materials similar to the components and density of JHL-2 explosive are selected, and the simulated material similar to the mechanical property of real explosive is designed according to the mechanical property data of the material and the pressing process parameters; in order to facilitate the study of aging performance, the simulated material with ammonium sulfate as the matrix can be recycled and discarded conveniently.

[0023] The butadiene rubber in the simulated material for mechanical test of pressed explosive helps to improve the plasticity of the material, and the graphite is a process aid.

[0024] According to the above technical solution, the specific embodiments of the present application are given below, and it should be noted that the present application is not limited to the following specific embodiments, and any equivalent transformation based on the technical solution of the present application falls within the protection scope of the present application.

[0025] Example 1:

[0026] The simulated material for mechanical test of pressed explosive is prepared from the following raw materials in parts by weight: 65.5% ammonium sulfate, 30% aluminum powder, 3% microcrystalline wax, 1.2% butadiene rubber and 0.3% graphite.

[0027] In this embodiment, the aluminum powder is flaky aluminum powder.

[0028] The preparation process of the simulated material for mechanical test of pressed explosive is as follows: first, 65.5% ammonium sulfate and ethanol solvent are added to a kneading pot for infiltration and mixing, 3% microcrystalline wax solution is added under the condition of 75℃ for mixing, kneading for 10 min, then 1.2% butadiene rubber solution is added for mixing, finally 30% flaky aluminum powder and 0.3% graphite are added, kneading for 20 min, and granulating by a granulator to obtain molding powder.

[0029] The pressing process of the simulated material for mechanical test of pressed explosive is as follows: when pressing, a mold with a diameter of 20 mm and a height of 20 mm is used, the mass of the molding powder is weighed according to the molding density of 1.8 g / cm 3 , the molding powder is poured into the mold, the pressure is set to 150 MPa, the pressure holding time is set to 3 min, and the pressing is carried out, then the mold is removed and trimmed after completion to obtain a shaped charge column.

[0030] The performance of the simulated material pressed into a propellant column and the poly black aluminum-2 (JHL-2) propellant pressed into a propellant column was compared and tested. The performance was tested according to the method specified in 413.1 and 416.1 of the known published national military standard GJB772A. The performance data is compared in Table 1.

[0031] Table 1 Performance data comparison

[0032]

[0033] As shown in Table 1, the tensile strength of the simulated material pressed into a propellant column is 0.53 MPa, the compression strength of the simulated material pressed into a propellant column is 7.25 MPa, and the tensile strength and compression strength of the simulated material pressed into a propellant column are equivalent to those of the poly black aluminum-2 (JHL-2) propellant pressed into a propellant column.

[0034] Example 2

[0035] The simulated material for the mechanical test of the pressed propellant is prepared according to the preparation process and the propellant pressing process of the example 1. The mass percentage composition of each component of the simulated material for the mechanical test of the pressed propellant is the same as that disclosed in the example 1. The difference is that the pressure setting in the propellant pressing process of the simulated material for the mechanical test of the pressed propellant is different.

[0036] In this example, the aluminum powder is a flaky aluminum powder.

[0037] In this example, the pressure setting in the propellant pressing process of the simulated material for the mechanical test of the pressed propellant is 200 MPa.

[0038] The preparation process of the simulated material for the mechanical test of the pressed propellant is as follows: 65.5% ammonium sulfate and ethanol solvent are added to a kneading pot for infiltration and mixing, 3% microcrystalline wax solution is added for mixing under the condition of 75°C, kneading for 10 min, 1.2% butadiene rubber solution is added for mixing, and finally 30% flaky aluminum powder and 0.3% graphite are added for kneading for 20 min. The molding powder is obtained by a granulator.

[0039] The propellant pressing process of the simulated material for the mechanical test of the pressed propellant is as follows: when pressing the propellant, a mold with a diameter of 20 mm and a height of 20 mm is used, the mass of the molding powder is weighed according to the molding density of the propellant column of 1.8 g / cm 3 , the molding powder is poured into the mold, the pressure is set to 200 MPa, the pressure holding time is set to 3 min, and the pressing is performed. After completion, the mold is removed and trimmed to obtain the molded propellant column.

[0040] The performance of the simulated material pressed into a propellant column and the JHL-2 propellant pressed into a propellant column was compared and tested. The performance was tested according to the method specified in 413.1 and 416.1 of the known published GJB772A. The performance data is shown in Table 2.

[0041] Table 2 Performance data comparison

[0042]

[0043] As shown in Table 2, the tensile strength of the simulated material pressed into a propellant column is 0.60 MPa, the compressive strength of the simulated material pressed into a propellant column is 7.55 MPa, and the tensile strength and the compressive strength of the simulated material pressed into a propellant column are equivalent to those of the JHL-2 propellant pressed into a propellant column. Compared with the pressure setting of 150 MPa in the propellant pressing process in Example 1, when the pressure setting in the propellant pressing process in the present example is 200 MPa, the tensile strength and the compressive strength of the simulated material pressed into a propellant column are improved.

[0044] Example 3

[0045] The present example provides a simulated material for pressing explosive mechanical test, and the preparation process and the propellant pressing process of the simulated material for pressing explosive mechanical test are basically the same as those disclosed in Example 1. The mass percentage composition of each component of the simulated material for pressing explosive mechanical test is the same as that disclosed in Example 1. The difference lies in the different forms of aluminum powder in the preparation process of the simulated material for pressing explosive mechanical test and the different pressure settings in the propellant pressing process of the simulated material for pressing explosive mechanical test.

[0046] In the present example, the aluminum powder is spherical aluminum powder.

[0047] In the present example, the pressure setting in the propellant pressing process of the simulated material for pressing explosive mechanical test is 200 MPa.

[0048] The preparation process of the simulated material for pressing explosive mechanical test is as follows: first, 65.5% ammonium sulfate and an ethanol solvent are added to a kneading pot for infiltration and mixing, 3% microcrystalline wax solution is added under the condition of 75°C for mixing, kneading for 10 min, 1.2% butadiene rubber solution is added for mixing, and finally 30% spherical aluminum powder and 0.3% graphite are added, and kneading for 20 min to obtain molding powder through a granulator.

[0049] The propellant pressing process of the simulated material for pressing explosive mechanical test is as follows: when pressing the propellant, a mold with a diameter of 20 mm and a height of 20 mm is used, and the propellant column is formed according to the density of 1.8 g / cm3 The mass of the molding powder is weighed, the molding powder is poured into a mold, the pressure is set to 200 MPa, the pressure maintaining time is set to 3 min, and pressing is performed. After completion, demolding and trimming are performed to obtain a shaped grain.

[0050] The performance of the grain pressed from the simulation material for mechanical test of pressed explosive and the grain pressed from JHL-2 explosive is compared and tested. The performance is determined by the method specified in 413.1 and 416.1 of GJB772A. The performance data comparison is shown in Table 3.

[0051] Table 3 Performance data comparison

[0052]

[0053] As shown in Table 3, the tensile strength of the grain pressed from the simulation material for mechanical test of pressed explosive is 0.71 MPa, the compressive strength of the grain pressed from the simulation material for mechanical test of pressed explosive is 7.72 MPa, and the tensile strength and the compressive strength of the grain pressed from the simulation material for mechanical test of pressed explosive are equivalent to those of the grain pressed from JHL-2 explosive. Compared with the flaky aluminum powder used in the preparation process of the simulation material for mechanical test of pressed explosive in Example 2, the spherical aluminum powder used in this example improves the tensile strength and the compressive strength of the grain pressed from the simulation material for mechanical test of pressed explosive.

Claims

1. A simulated material for use in a press-pack explosive mechanics test, characterised in that, The following raw materials are used in parts by weight: 65.5% ammonium sulfate, 30% aluminum powder, 3% microcrystalline wax, 1.2% butadiene rubber, and 0.3% graphite; The aluminum powder is flaky aluminum powder or spherical aluminum powder; The preparation process of the simulated material for the mechanical test of the pressed explosive is as follows: ammonium sulfate and an ethanol solvent are added into a kneading pot for infiltration and mixing, dissolved microcrystalline wax solution and butadiene rubber solution are added for mixing, and aluminum powder and graphite are added for uniform kneading, and then granulation is performed by using a granulator to obtain molding powder; The explosive pressing process of the simulated material for the mechanical test of the pressed explosive is as follows: a mold is selected according to the size of the explosive column, the mass of the molding powder is weighed according to the molding density of the explosive column, the molding powder is poured into the mold, the explosive pressing pressure and the pressure maintaining time are set for pressing, and after completion, demolding and trimming are performed to obtain a molded explosive column.

2. The simulated material for press-detonating explosive mechanics testing of claim 1, wherein, The explosive pressing pressure is 120 MPa to 210 MPa.

3. The simulated material for press-detonating explosive mechanics testing of claim 1, wherein, The mold has a diameter of 20 mm and a height of 20 mm.

4. The simulated material for press-detonating explosive mechanics testing of claim 1, wherein, The formed density of the said propellant is 1.8g / cm 3 .

5. The simulated material for press-detonating explosive mechanics testing of claim 1, wherein, The pressure maintaining time is 3 min.

6. The simulated material for press-detonating explosive mechanics testing of claim 1, wherein, The tensile strength of the explosive column ranges from 0.5 MPa to 0.8 MPa.

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