Explosive charging reaction threshold value measuring device based on thermal-compression-shear coupling effect

Abstract

The invention provides a thermal-compression-shear coupling effect-based explosive charging reaction threshold value measuring device, which comprises a sleeve, the sleeve comprises a cylindrical sleeve body, and the sleeve body is internally and coaxially provided with an axially through sleeve center cylindrical cavity; a lower striking column, a grain bottom isolation plastic pad, a grain circumferential isolation plastic ring, a compression-shear conversion rubber pad and an upper striking column are sequentially and coaxially arranged in the cylindrical cavity in the center of the sleeve from bottom to top in the axial direction. An explosive column is further coaxially arranged in the explosive column circumferential isolation plastic ring, the axial length of the explosive column is equal to the axial length of the explosive column circumferential isolation plastic ring, and the diameter of the explosive column is equal to the inner diameter of the explosive column circumferential isolation plastic ring. The sleeve body is further provided with a sleeve thermocouple, and the sleeve body is further coaxially sleeved with an annular heating sleeve. According to the device, the reaction threshold value of the explosive charge under the heat-pressure-shear coupling effect can be obtained, and the amplitudes of the heat load and the mechanical impact load borne by the explosive charge can be quantitatively adjusted.

Description

Technical Field

[0001] This invention belongs to the field of explosive performance testing technology, and relates to a reaction threshold measuring device, specifically a device for measuring the reaction threshold of explosive charge based on thermal-compression-shear coupling. Background Technology

[0002] With the rapid development of hypersonic weapons, the problem of internal explosive charges heating due to aerodynamic heating during flight has become increasingly prominent. Furthermore, when hypersonic penetrating weapons attack deep underground fortifications, the internal explosive charges are simultaneously subjected to intense impact loads, creating a state where temperature and impact loads act synchronously. This poses a more severe challenge to the stability of the explosive charge. Current research in this area is slow due to the lack of reliable thermo-mechanical synchronous coupling loading test equipment, failing to meet the requirements for optimized design of hypersonic weapon charges.

[0003] Current research on the reaction characteristics of explosive charges under external stimuli has two main shortcomings: First, existing studies usually only consider single load effects, such as thermal loads or mechanical loads, without considering the situation of multiple load coupling effects, and lack reliable experimental devices for simultaneous loading of multiple loads; Second, existing experimental studies on mechanical load effects cannot quantitatively adjust the proportion of different types of mechanical loads. For example, in the Steven test, the ratio of compressive load and shear load on the explosive charge is fixed and cannot be adjusted. However, for explosive charges, the reaction characteristics of the explosive charge are usually different under different types of mechanical loads. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide an explosive charge reaction threshold measuring device based on thermal-compression-shear coupling, thereby solving the technical problem that existing reaction threshold measuring devices cannot simultaneously achieve the simultaneous loading of multiple loads on explosive charges and the control of the mechanical load ratio.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A device for measuring the reaction threshold of explosive charge based on thermal-compression-shear coupling includes a sleeve. The sleeve includes a cylindrical sleeve body. An axially penetrating central cylindrical cavity is coaxially arranged within the sleeve body. A lower impact post, a bottom insulating plastic pad for the explosive charge, and a circumferential insulating plastic ring for the explosive charge are coaxially arranged from bottom to top within the central cylindrical cavity.

[0006] The explosive charge is coaxially arranged inside the circumferentially insulating plastic ring of the explosive charge. The axial length of the explosive charge is equal to the axial length of the circumferentially insulating plastic ring of the explosive charge, and the diameter of the explosive charge is equal to the inner diameter of the circumferentially insulating plastic ring of the explosive charge.

[0007] The sleeve's central cylindrical cavity is also coaxially provided with a pressure-shear conversion rubber pad, which is positioned at the axial top of the circumferentially isolating plastic ring of the propellant; the sleeve's central cylindrical cavity is also coaxially provided with an upper impact post, which is positioned at the axial top of the pressure-shear conversion rubber pad.

[0008] The sleeve body is also equipped with a sleeve thermocouple, and an annular heating sleeve is coaxially fitted outside the sleeve body.

[0009] The present invention also has the following technical features: Specifically, the compression-shear conversion rubber pad includes a cylindrical compression-shear conversion rubber pad body, and a compression-shear conversion rubber pad top concave spherical surface is coaxially formed at the top of the compression-shear conversion rubber pad body.

[0010] The upper impact column includes a cylindrical upper impact column body. The bottom of the upper impact column body is coaxially provided with a convex spherical surface at the bottom of the upper impact column. The convex spherical surface at the bottom of the upper impact column is in contact with the concave spherical surface at the top of the pressure-shear conversion rubber pad. The radius of the spherical surface of the convex spherical surface at the bottom of the upper impact column is equal to the radius of the spherical surface of the concave spherical surface at the top of the pressure-shear conversion rubber pad.

[0011] Specifically, the axial top of the upper striking post extends beyond the axial top of the sleeve body, and a pressure-acting end cap is also provided at the axial top of the upper striking post.

[0012] Preferably, the axial length of the compression-shear conversion rubber pad at the central axis is 1mm to 2mm when it is not compressed.

[0013] When the compression-shear conversion rubber pad is not compressed, the diameter of the compression-shear conversion rubber pad body is still equal to the inner diameter of the central cylindrical cavity of the sleeve.

[0014] Specifically, the axial bottom of the impact post extends beyond the axial bottom of the sleeve body.

[0015] The downward striking post is cylindrical in shape, and its diameter is equal to the inner diameter of the central cylindrical cavity of the sleeve.

[0016] Specifically, the shape of the insulating plastic pad at the bottom of the drug cartridge is a cylindrical sheet, and the diameter of the insulating plastic pad at the bottom of the drug cartridge is equal to the inner diameter of the central cylindrical cavity of the sleeve.

[0017] The cross-sectional shape of the circumferential insulating plastic ring of the drug cartridge is circular, and the outer diameter of the circumferential insulating plastic ring of the drug cartridge is equal to the inner diameter of the central cylindrical cavity of the sleeve.

[0018] Specifically, the diameter of the upper striking column body is equal to the inner diameter of the central cylindrical cavity of the sleeve.

[0019] The pressure-acting end cap includes a cylindrical pressure-acting end cap body. The bottom of the pressure-acting end cap body is also coaxially provided with a blind hole at the bottom of the end cap. The inner diameter of the blind hole at the bottom of the end cap is equal to the diameter of the upper impact column body. The top of the upper impact column body is installed on the pressure-acting end cap through the blind hole at the bottom of the end cap.

[0020] Specifically, a sleeve thermocouple mounting groove is provided along the axial direction at the bottom of the outer side of the sleeve body, and a sleeve thermocouple is provided in the sleeve thermocouple mounting groove.

[0021] The length of the sleeve thermocouple mounting groove is less than the axial length of the sleeve body; the width of the sleeve thermocouple mounting groove is greater than or equal to the width of the sleeve thermocouple; and the depth of the sleeve thermocouple mounting groove is greater than or equal to the radial height of the sleeve thermocouple.

[0022] Specifically, the annular heating sleeve has a circular cross-sectional shape, the inner diameter of the annular heating sleeve is greater than or equal to the outer diameter of the sleeve body, and the axial length of the annular heating sleeve is less than the axial length of the sleeve body.

[0023] The axial bottom of the annular heating sleeve is flush with the axial bottom of the sleeve body, and the axial top of the sleeve body extends beyond the axial top of the annular heating sleeve.

[0024] Specifically, the sleeve, lower striking post, upper striking post, and pressure-applying end cap are all made of metal.

[0025] Compared with the prior art, the present invention has the following technical effects: (I) The device in this invention can obtain the reaction threshold of the explosive charge under the action of heat-pressure-shear coupling, and can quantitatively adjust the amplitude of the thermal load and mechanical impact load on the explosive charge. The initial temperature of the charge is precisely controlled by the annular heating jacket and the sleeve thermocouple, and the magnitude of the impact load on the charge is precisely controlled by filling the high-pressure gas chamber with high-pressure nitrogen at different pressures.

[0026] (II) The device in this invention can quantitatively adjust the ratio of compressive load to shear load on the explosive charge. By adjusting the radius of curvature of the convex spherical surface at the bottom of the upper striking post, the ratio of compressive load to shear load on the explosive charge is adjusted. The larger the radius of curvature, the closer the convex spherical surface at the bottom of the upper striking post is to a plane, the less likely the explosive charge is to flow outwards, and the larger the proportion of compressive load on the explosive charge; conversely, the smaller the radius of curvature, the larger the proportion of shear load on the explosive charge. The specific amplitudes of shear load and compressive load are obtained through numerical simulation calculation.

[0027] (III) The device in this invention can not only simultaneously provide a quantitative thermal and mechanical stimulus to the explosive charge, but also change the flow direction of the explosive charge upon impact by adjusting the radius of curvature of the convex spherical surface at the bottom of the upper impact post, thereby adjusting the ratio of compressive load to shear load on the explosive charge. By using the projectile impact method, the reaction threshold of the explosive charge under the synchronous coupling of a quantitative thermal load, compressive load, and shear load can be obtained, providing necessary technical support for the development of new anti-overload explosive charges and the selection of charges for penetrating munitions. Attached Figure Description

[0028] Figure 1 This is a cross-sectional schematic diagram of the overall structure of the testing device in this invention.

[0029] Figure 2 This is a schematic diagram of the layout structure of the testing device in this invention during the experiment.

[0030] Figure 3 These are the time history curves of the compressive load amplitude and shear load amplitude experienced by the explosive charge in the embodiments of the present invention.

[0031] The labels in the diagram represent the following: 1-sleeve, 2-downward impact pin, 3-bottom insulating plastic pad of the propellant charge, 4-circumferential insulating plastic ring of the propellant charge, 5-explosive charge, 6-compression-shear conversion rubber pad, 7-upward impact pin, 8-pressure-acting end cap, 9-sleeve thermocouple, 10-ring heating sleeve, 11-installation chamber, 12-projectile movement chamber, 13-high-pressure launch chamber, 14-installation cavity, 15-downward impact pin installation platform, 16-protective cylinder, 17-downward impact pin installation blind hole, 18-positioning ring, 19-thermocouple wire perforation, 20-high-speed impact projectile.

[0032] 101-Sleeve body, 102-Sleeve central cylindrical cavity, 103-Sleeve thermocouple mounting groove.

[0033] 601 - Compression-shear conversion rubber pad body; 602 - Top concave spherical surface of compression-shear conversion rubber pad.

[0034] 701 - Strike the main body of the upper column; 702 - Strike the convex spherical surface at the bottom of the upper column.

[0035] 801 - Pressure-acting end cap body; 802 - Blind hole at the bottom of the end cap.

[0036] The specific content of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0037] It should be noted that, unless otherwise specified, all components, materials and methods in this invention adopt commonly used components, materials and methods known in the art in the prior art. For example, the high-pressure launch chamber adopts a known high-pressure launch chamber, the T10A steel adopts a known T10A steel, the projectile impact method adopts a known projectile impact method, and the numerical simulation method adopts a known numerical simulation method.

[0038] Following the above technical solution, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of the present invention fall within the protection scope of the present invention.

[0039] Example: This embodiment provides a device for measuring the reaction threshold of explosive charges based on thermal-compression-shear coupling, such as... Figure 1 As shown, it includes a sleeve 1, which includes a cylindrical sleeve body 101. A central cylindrical cavity 102 is coaxially disposed inside the sleeve body 101. A lower striking post 2, a bottom insulating plastic pad 3 of the drug post, and a circumferential insulating plastic ring 4 of the drug post are coaxially disposed from bottom to top inside the central cylindrical cavity 102.

[0040] An explosive charge 5 is coaxially arranged inside the circumferentially insulating plastic ring 4 of the explosive charge. The axial length of the explosive charge 5 is equal to the axial length of the circumferentially insulating plastic ring 4 of the explosive charge, and the diameter of the explosive charge 5 is equal to the inner diameter of the circumferentially insulating plastic ring 4 of the explosive charge.

[0041] A pressure-shear conversion rubber pad 6 is also coaxially arranged inside the central cylindrical cavity 102 of the sleeve, and the pressure-shear conversion rubber pad 6 is arranged at the axial top of the circumferential isolation plastic ring 4 of the propellant; an upper impact post 7 is also coaxially arranged inside the central cylindrical cavity 102 of the sleeve, and the upper impact post 7 is arranged at the axial top of the pressure-shear conversion rubber pad 6.

[0042] A sleeve thermocouple 9 is also installed on the sleeve body 101, and an annular heating sleeve 10 is coaxially fitted outside the sleeve body 101.

[0043] As a preferred embodiment, the compression-shear conversion rubber pad 6 includes a cylindrical compression-shear conversion rubber pad body 601, and a compression-shear conversion rubber pad top concave spherical surface 602 is coaxially formed at the top of the compression-shear conversion rubber pad body 601.

[0044] The upper striking post 7 includes a cylindrical upper striking post body 701. The axial bottom of the upper striking post body 701 is coaxially provided with a bottom convex spherical surface 702 of the upper striking post. The bottom convex spherical surface 702 of the upper striking post is in contact with the top concave spherical surface 602 of the pressure-shear conversion rubber pad. The spherical radius of the bottom convex spherical surface 702 of the upper striking post is equal to the spherical radius of the top concave spherical surface 602 of the pressure-shear conversion rubber pad.

[0045] As a preferred embodiment, the axial top of the upper striking post 7 extends beyond the axial top of the sleeve body 101, and a pressure-acting end cap 8 is also provided at the axial top of the upper striking post 7.

[0046] In this embodiment, the axial direction of the sleeve body 101 is the horizontal direction, the inner diameter refers to the internal diameter, and the outer diameter refers to the external diameter.

[0047] In this embodiment, the inner diameter of the central cylindrical cavity 102 of the sleeve, i.e., the inner hole diameter d, is used as the reference. The outer diameter of the sleeve body 101 is 2.0d to 4.0d, and the axial length of the sleeve body 101 is 2.0d to 6.0d. In a further preferred embodiment, the inner diameter d of the central cylindrical cavity 102 of the sleeve is 40mm, the outer diameter of the sleeve body 101 is 88mm, and the axial length of the sleeve body 101 is 150mm.

[0048] In this embodiment, the explosive charge 5 is the explosive charge. The explosive charge 5 is an octogen (HMX) based aluminum explosive. The diameter of the explosive charge 5 is 30 mm and the axial length of the explosive charge 5 is 30 mm. The octogen (HMX) based aluminum explosive is a commonly known octogen (HMX) based aluminum explosive in the art.

[0049] In this embodiment, the compression-shear conversion rubber pad 6 is used between the upper impact post 7 and the explosive charge 5 to restrict the displacement of the explosive charge 5 and push the explosive charge 5 outward; the radius of the concave spherical surface 602 at the top of the compression-shear conversion rubber pad is 0.5d to 2.0d; in a further preferred embodiment, in the uncompressed state, the diameter of the compression-shear conversion rubber pad body 601 is 40mm, the radius of the concave spherical surface 602 at the top of the compression-shear conversion rubber pad is 25mm, and the axial length of the compression-shear conversion rubber pad 6 at the central axis is 1mm.

[0050] In this embodiment, the upper impact post 7 is used to impact the explosive charge 5, providing an axial impact load to the explosive charge 5 and pushing the explosive charge 5 outward; the axial length of the upper impact post body 701 is 2.0d to 4.0d; in this embodiment, it is further preferred that the diameter of the upper impact post body 701 is 40mm, the axial length of the upper impact post body 701 is 120mm, and the spherical radius of the convex spherical surface 702 at the bottom of the upper impact post is 25mm.

[0051] In this embodiment, the convex spherical surface 702 at the bottom of the upper impact column and the concave spherical surface 602 at the top of the compression-shear conversion rubber pad can be completely fitted together. The size of the spherical radius or the radius of curvature can be adjusted by replacing the compression-shear conversion rubber pad 6 and the upper impact column 7. The adjustment range of the spherical radius of the two is 0.5d to 2.0d. The proportion of shear load on the explosive charge 5 can be changed by adjusting the spherical radius or the radius of curvature of the two. The larger the spherical radius of the concave spherical surface 602 at the top of the compression-shear conversion rubber pad, the closer it is to a plane, the more difficult it is for the explosive charge 5 to flow to the surroundings, and the greater the proportion of compressive load it receives; conversely, the smaller the spherical radius of the explosive charge 5, the easier it is for it to flow to the surroundings, and the greater the proportion of shear load it receives.

[0052] In this embodiment, to ensure proper assembly, the inner diameter tolerance of the cylindrical cavity 102 at the center of the sleeve is set to 0.02mm to 0.05mm, and the diameter tolerances of the lower impact column 2, the bottom insulating plastic pad 3 of the propellant, the outer diameter tolerance of the circumferential insulating plastic ring 4 of the propellant, the pressure-shear conversion rubber pad body 601, and the upper impact column body 701 are all set to -0.025mm to -0.05mm.

[0053] In this embodiment, the surface roughness Ra of the inner wall of the sleeve 1, the outer wall of the lower striking post 2, and the outer wall of the upper striking post 7 is set to 0.8.

[0054] As a preferred embodiment, the axial length of the compression-shear conversion rubber pad 6 at the central axis is 1mm to 2mm when it is not compressed.

[0055] When the compression-shear conversion rubber pad 6 is not compressed, the diameter of the compression-shear conversion rubber pad body 601 is still equal to the inner diameter of the central cylindrical cavity 102 of the sleeve.

[0056] As a preferred embodiment, the axial bottom of the striking post 2 extends beyond the axial bottom of the sleeve body 101.

[0057] The shape of the lower striking post 2 is cylindrical, and the diameter of the lower striking post 2 is equal to the inner diameter of the cylindrical cavity 102 in the center of the sleeve.

[0058] In this embodiment, the axial length of the lower impact post 2 is 1.5d to 3.0d; in a further preferred embodiment, the diameter of the lower impact post 2 is 40mm and the axial length of the lower impact post 2 is 70mm.

[0059] As a preferred embodiment, the bottom insulating plastic pad 3 of the drug cartridge is shaped as a cylindrical sheet, and the diameter of the bottom insulating plastic pad 3 of the drug cartridge is equal to the inner diameter of the central cylindrical cavity 102 of the sleeve.

[0060] The cross-sectional shape of the circumferential insulating plastic ring 4 of the propellant is circular, and the outer diameter of the circumferential insulating plastic ring 4 of the propellant is equal to the inner diameter of the central cylindrical cavity 102 of the sleeve.

[0061] In this embodiment, the bottom insulating plastic pad 3 of the explosive charge is used to isolate the explosive charge 5 from the downward striking post 2, reducing friction between the explosive and the metal; the axial length of the bottom insulating plastic pad 3 of the explosive charge is 0.1d to 0.2d; in this embodiment, it is further preferred that the diameter of the bottom insulating plastic pad 3 of the explosive charge is 40mm and the axial length of the bottom insulating plastic pad 3 of the explosive charge is 5mm.

[0062] In this embodiment, the circumferential insulating plastic ring 4 of the explosive charge is used to isolate the friction between the explosive charge 5 and the sleeve body 101; the inner diameter of the circumferential insulating plastic ring 4 of the explosive charge is 0.6d to 0.8d, and the axial length is 0.6d to 0.8d; in this embodiment, it is further preferred that the outer diameter of the circumferential insulating plastic ring 4 of the explosive charge is 40mm, the inner diameter of the circumferential insulating plastic ring 4 of the explosive charge is 30mm, and the axial length of the circumferential insulating plastic ring 4 of the explosive charge is 30mm.

[0063] As a preferred embodiment, the diameter of the upper striking column body 701 is equal to the inner diameter of the central cylindrical cavity 102 of the sleeve.

[0064] The pressure-acting end cap 8 includes a cylindrical pressure-acting end cap body 801. The bottom of the pressure-acting end cap body 801 is also coaxially provided with a blind hole 802 at the bottom of the end cap. The inner diameter of the bottom blind hole 802 is equal to the diameter of the upper impact column body 701. The top of the upper impact column body 701 is mounted on the pressure-acting end cap 8 through the bottom blind hole 802.

[0065] In this embodiment, the pressure-acting end cap 8 is used to transmit impact loads; the outer diameter of the pressure-acting end cap body 801 is 2.0d to 2.8d, and the axial length is 0.2d to 0.8d; the diameter of the blind hole 802 at the bottom of the end cap is d, and the axial depth is 0.1d to 0.2d; in a further preferred embodiment, the outer diameter of the pressure-acting end cap body 801 is 100mm, the axial length of the pressure-acting end cap body 801 is 25mm, the diameter of the blind hole 802 at the bottom of the end cap is 40mm, and the axial depth of the blind hole 802 at the bottom of the end cap is 5mm.

[0066] In this embodiment, by adjusting the thickness of the pressure-applying end cap, the response characteristics of the explosive charge under different loading intensities can be obtained; in this embodiment, adjusting the thickness of the pressure-applying end cap 8 refers to replacing the pressure-applying end cap body 801 with a different thickness.

[0067] In this embodiment, the axial top of the outer side wall of the upper impact post body 701 is also bonded to the inner side wall of the blind hole 802 at the bottom of the end cap, so as to further install and fix the pressure end cap 8 on the axial top of the upper impact post 7.

[0068] As a preferred embodiment, a sleeve thermocouple mounting groove 103 is also provided on the axial bottom of the outer side of the sleeve body 101 along the axial direction, and a sleeve thermocouple 9 is provided in the sleeve thermocouple mounting groove 103.

[0069] The length of the sleeve thermocouple mounting groove 103 is less than the axial length of the sleeve body 101; the width of the sleeve thermocouple mounting groove 103 is greater than or equal to the width of the sleeve thermocouple 9; and the depth of the sleeve thermocouple mounting groove 103 is greater than or equal to the radial height of the sleeve thermocouple 9.

[0070] In this embodiment, the groove depth of the sleeve thermocouple mounting groove 103 is 2.0mm to 2.5mm, and the groove length is 0.4d to 0.6d; in a further preferred embodiment, the groove depth of the sleeve thermocouple mounting groove 103 is 2.0mm, and the groove length is 75mm.

[0071] In this embodiment, the temperature measurement range of the sleeve thermocouple 9 is 0 to 800°C. The sleeve thermocouple 9 is an armored thermocouple, and the armored thermocouple is a commonly used armored thermocouple known in the art.

[0072] In this embodiment, the sleeve thermocouple 9 and the annular heating jacket 10 are connected by a temperature control unit. The sleeve thermocouple 9 is used to measure the temperature of the outer wall surface of the sleeve 1, and then control the temperature of the center of the explosive charge 5 through the calibration curve. The temperature control unit adopts the temperature control unit commonly known in the art. The calibration curve method adopts the calibration curve method commonly known in the art.

[0073] As a preferred embodiment, the annular heating sleeve 10 has a circular cross-sectional shape, the inner diameter of the annular heating sleeve 10 is greater than or equal to the outer diameter of the sleeve body 101, and the axial length of the annular heating sleeve 10 is less than the axial length of the sleeve body 101.

[0074] The axial bottom of the annular heating sleeve 10 is flush with the axial bottom of the sleeve body 101, and the axial top of the sleeve body 101 extends beyond the axial top of the annular heating sleeve 10.

[0075] In this embodiment, the annular heating sleeve 10 is used to heat the entire measuring device in this embodiment. The annular heating sleeve 10 is a metal annular heating sleeve, and the metal annular heating sleeve adopts the commonly used metal annular heating sleeve known in the art. In this embodiment, it is further preferred that the axial length of the annular heating sleeve 10 is 140mm.

[0076] As a preferred embodiment, the sleeve 1, the lower striking post 2, the upper striking post 7, and the pressure-acting end cap 8 are all made of metal.

[0077] In this embodiment, the sleeve 1, the lower striking post 2, the upper striking post 7, and the pressure-acting end cap 8 are all made of T10A steel, and the T10A steel used is the commonly known T10A steel in the art.

[0078] In this embodiment, the high-speed impact projectile 17 of the 2kg polyethylene pellet is a high-speed impact projectile commonly known in the art; the high-pressure launch chamber 13 is a high-pressure launch chamber commonly known in the art; and the high-pressure gas chamber is a high-pressure gas chamber commonly known in the art.

[0079] The measuring device in this embodiment needs to be used in conjunction with the test unit, such as... Figure 2 As shown, the test unit includes, from bottom to top along the axial direction, a coaxially arranged and sealed installation chamber 11, a projectile movement chamber 12, and a high-pressure launch chamber 13. An installation cavity 14 is coaxially arranged within the installation chamber 11. Within the installation cavity 14, from bottom to top along the axial direction, a strike post mounting platform 15 and a protective cylinder 16 are coaxially installed. The strike post mounting platform 15 includes a cuboid mounting platform body. A strike post mounting blind hole 17 is coaxially opened at the top axial direction of the mounting platform body. The inner diameter of the strike post mounting blind hole 17 is equal to the diameter of the strike post 2. The bottom axial direction of the strike post 2 is inserted into the strike post mounting blind hole 17 to support the bottom axial direction of the measuring device. The top axial direction of the mounting platform body is also connected to the bottom axial direction of the protective cylinder 16.

[0080] The protective cylinder 16 is a cylindrical structure with open ends along the axial direction. The inner diameter of the protective cylinder 16 is larger than the outer diameter of the annular heating sleeve 10. A positioning ring 18 is coaxially installed inside the protective cylinder 16 near the axial front end. The axial distance between the bottom of the positioning ring 18 and the bottom of the blind hole 17 for mounting the lower impact post is greater than the axial distance between the top of the annular heating sleeve 10 and the bottom of the lower impact post 2. The outer diameter of the positioning ring 18 is equal to the inner diameter of the protective cylinder 16. The inner diameter of the positioning ring 18 is equal to the outer diameter of the sleeve 1. The top of the sleeve 1 is installed inside the positioning ring 18 to support the top of the measuring device along the axial direction. A radially penetrating thermocouple wire through hole 19 is also provided on the bottom of the side wall of the protective cylinder 16.

[0081] The projectile movement chamber 12 is long and tubular. The cavity inside the projectile movement chamber 12 is a projectile airflow movement chamber. A high-speed impact projectile 20 is installed inside the projectile airflow movement chamber. The high-speed impact projectile 20 is coaxially arranged with the pressure end cap 8. The cross-section of the high-speed impact projectile 20 is larger than the cross-section of the pressure end cap body 801. Under the impetus of high-pressure nitrogen, the high-speed impact projectile 20 moves axially from top to bottom from the projectile airflow movement chamber of the projectile movement chamber 12 to the installation cavity 14, and then impacts the axial top of the pressure end cap 8.

[0082] In this embodiment, the high-pressure nitrogen gas used is the commonly known high-pressure nitrogen gas in the art.

[0083] In this embodiment, the protective cylinder 16 is a thin-walled steel cylinder, which is a commonly used thin-walled steel cylinder known in the art.

[0084] In this embodiment, high-pressure nitrogen is introduced from the high-pressure launch chamber 13, and then released to push the high-speed impact projectile 20 to move from top to bottom along the axial direction, so that the high-speed impact projectile 20 impacts the top of the pressure-acting end cap 8, thereby forming a punching and shearing compression effect on the explosive charge 5, and obtaining the reaction threshold of the explosive through the reaction state of the explosive.

[0085] The method of using and working principle of the measuring device in this embodiment is as follows: The lower impact column 2, the bottom insulating plastic pad 3 of the explosive charge, and the circumferential insulating plastic ring 4 of the explosive charge 5 are sequentially installed into the central cylindrical cavity 102 of the sleeve 1. One flat end of the pressure-shear conversion rubber pad 6 is inserted into one side of the explosive charge 5. One convex spherical surface 702 of the bottom of the upper impact column 7 is inserted into one side of the concave spherical surface 602 of the top of the pressure-shear conversion rubber pad 6. The pressure-acting end cap 8 is installed on one side of the flat end of the upper impact column 7. The sleeve thermocouple 9 is installed into the sleeve thermocouple mounting groove 103 of the sleeve 1. The annular heating sleeve 10 is wrapped around the sleeve 1, securely preventing it from falling off. A cross-sectional schematic diagram of the overall structure of the fully installed testing device is attached. Figure 1 As shown. During the test, the test device was subjected to impact loading using a projectile impact method.

[0086] The load on the explosive charge 5 consists of two stages: the first stage is the compression stage, and the second stage is the shear stage. After the high-pressure launch chamber 13 is released, the high-pressure nitrogen gas propels the high-speed impact projectile 20 to accelerate, impacting the pressure end cap 8 at a preset speed. The impact load on the explosive charge 5 is achieved through the transmission of the upper impact column 7 and the compression-shear conversion rubber pad 6. In the first stage, the explosive charge 5 is mainly subjected to axial compression by the upper impact column 7, resulting in volume change under the compressive load. In the second stage, due to the softness of the compression-shear conversion rubber pad 6, the explosive charge 5 flows outward under the action of the convex spherical surface 702 at the bottom of the upper impact column, thus generating a shear effect. The smaller the radius of curvature of the convex spherical surface 702 at the bottom of the upper impact column 7, the easier it is for the explosive charge 5 to flow radially, and the higher the proportion of shear load it experiences. Therefore, the proportion of shear load on the explosive charge 5 can be changed by altering the radius of curvature of the convex spherical surface 702 at the bottom of the upper impact column 5. In this embodiment, the maximum pressure of the explosive charge (5) is used to represent the compressive load on the explosive charge, and the maximum equivalent stress of the explosive charge is used to represent the shear load on the explosive charge. Figure 3 The time history curves of the compressive load amplitude and the shear load amplitude show that the compression-shear ratio in this embodiment is 2.4.

[0087] In this embodiment, the radius of curvature of the convex spherical surface 702 at the bottom of the upper impact post 7 is 25 mm, the preset temperature of the explosive charge 5 is 80°C, and the high-speed impact projectile 20 is a 2 kg polyethylene pellet. The impact velocity of the high-speed impact projectile 20 is adjusted by changing the pressure of the high-pressure nitrogen gas in the high-pressure chamber of the high-pressure launch chamber 13. The impact velocity is used to represent the reaction threshold of the explosive charge. High-pressure nitrogen gas at different pressures is introduced into the high-pressure chamber to regulate the impact velocity of the high-speed impact projectile 20. The HMX-based aluminum-containing explosive charge is loaded onto the end cap 8 with impact pressure at different velocities. When the velocity of the high-speed impact projectile 20 increases to 400 m / s, the HMX-based aluminum-containing explosive charge undergoes an ignition reaction, indicating that the critical reaction threshold of the HMX-based aluminum-containing explosive charge under the action of thermo-compression-shear coupling is 400 m / s.

Claims

1. A device for measuring the reaction threshold of explosive charges based on thermal-compression-shear coupling, characterized in that, Includes a sleeve (1), the sleeve (1) includes a cylindrical sleeve body (101), the sleeve body (101) has an axially penetrating central cylindrical cavity (102) coaxially arranged inside the sleeve body (101), and the central cylindrical cavity (102) has a lower striking post (2), a bottom insulating plastic pad (3) of the drug cartridge and a circumferential insulating plastic ring (4) of the drug cartridge coaxially arranged from bottom to top along the axial direction. The explosive charge (5) is also coaxially arranged inside the circumferentially insulating plastic ring (4) of the charge charge. The axial length of the explosive charge (5) is equal to the axial length of the circumferentially insulating plastic ring (4) of the charge charge, and the diameter of the explosive charge (5) is equal to the inner diameter of the circumferentially insulating plastic ring (4) of the charge charge. The sleeve's central cylindrical cavity (102) is also coaxially provided with a pressure-shear conversion rubber pad (6), which is arranged at the axial top of the circumferential isolation plastic ring (4) of the drug cartridge; the sleeve's central cylindrical cavity (102) is also coaxially provided with an upper impact column (7), which is arranged at the axial top of the pressure-shear conversion rubber pad (6); The sleeve body (101) is also equipped with a sleeve thermocouple (9), and an annular heating sleeve (10) is coaxially fitted outside the sleeve body (101).

2. The explosive charge reaction threshold measuring device based on thermal-compression-shear coupling as described in claim 1, characterized in that, The pressure-shear conversion rubber pad (6) includes a cylindrical pressure-shear conversion rubber pad body (601), and the top of the pressure-shear conversion rubber pad body (601) is coaxially provided with a pressure-shear conversion rubber pad top concave spherical surface (602). The upper impact column (7) includes a cylindrical upper impact column body (701). The bottom of the upper impact column body (701) is coaxially provided with a bottom convex spherical surface (702). The bottom convex spherical surface (702) of the upper impact column is in contact with the top concave spherical surface (602) of the pressure-shear conversion rubber pad. The spherical radius of the bottom convex spherical surface (702) of the upper impact column is equal to the spherical radius of the top concave spherical surface (602) of the pressure-shear conversion rubber pad.

3. The explosive charge reaction threshold measuring device based on thermal-compression-shear coupling as described in claim 2, characterized in that, The axial top of the upper striking post (7) extends beyond the axial top of the sleeve body (101), and a pressure-acting end cap (8) is also provided on the axial top of the upper striking post (7).

4. The explosive charge reaction threshold measuring device based on thermal-compression-shear coupling as described in claim 3, characterized in that, When the compression-shear conversion rubber pad (6) is not compressed, the axial length of the compression-shear conversion rubber pad (6) at the central axis is 1mm to 2mm. When the compression-shear conversion rubber pad (6) is not compressed, the diameter of the compression-shear conversion rubber pad body (601) is still equal to the inner diameter of the cylindrical cavity (102) at the center of the sleeve.

5. The explosive charge reaction threshold measuring device based on thermal-compression-shear coupling as described in claim 3, characterized in that, The axial bottom of the lower striking post (2) extends beyond the axial bottom of the sleeve body (101); The shape of the lower striking post (2) is a cylinder, and the diameter of the lower striking post (2) is equal to the inner diameter of the cylindrical cavity (102) at the center of the sleeve.

6. The explosive charge reaction threshold measuring device based on thermal-compression-shear coupling as described in claim 3, characterized in that, The shape of the insulating plastic pad (3) at the bottom of the drug column is a cylindrical sheet, and the diameter of the insulating plastic pad (3) at the bottom of the drug column is equal to the inner diameter of the cylindrical cavity (102) at the center of the sleeve; The cross-sectional shape of the circumferential isolation plastic ring (4) of the drug column is circular, and the outer diameter of the circumferential isolation plastic ring (4) of the drug column is equal to the inner diameter of the central cylindrical cavity (102) of the sleeve.

7. The explosive charge reaction threshold measuring device based on thermal-compression-shear coupling as described in claim 3, characterized in that, The diameter of the upper striking column body (701) is equal to the inner diameter of the central cylindrical cavity (102) of the sleeve; The pressure end cap (8) includes a cylindrical pressure end cap body (801). The bottom of the pressure end cap body (801) is also coaxially provided with a blind hole (802) at the bottom of the end cap. The inner diameter of the blind hole (802) at the bottom of the end cap is equal to the diameter of the upper impact column body (701). The top of the upper impact column body (701) is installed on the pressure end cap (8) through the blind hole (802) at the bottom of the end cap.

8. The explosive charge reaction threshold measuring device based on thermal-compression-shear coupling as described in claim 3, characterized in that, The outer side of the sleeve body (101) is provided with a sleeve thermocouple mounting groove (103) along the axial direction at the bottom. A sleeve thermocouple (9) is provided in the sleeve thermocouple mounting groove (103). The length of the sleeve thermocouple mounting groove (103) is less than the axial length of the sleeve body (101); the width of the sleeve thermocouple mounting groove (103) is greater than or equal to the width of the sleeve thermocouple (9); and the depth of the sleeve thermocouple mounting groove (103) is greater than or equal to the radial height of the sleeve thermocouple (9).

9. The explosive charge reaction threshold measuring device based on thermal-compression-shear coupling as described in claim 3, characterized in that, The annular heating sleeve (10) has a circular cross-sectional shape. The inner diameter of the annular heating sleeve (10) is greater than or equal to the outer diameter of the sleeve body (101). The axial length of the annular heating sleeve (10) is less than the axial length of the sleeve body (101). The axial bottom of the annular heating sleeve (10) is flush with the axial bottom of the sleeve body (101), and the axial top of the sleeve body (101) extends beyond the axial top of the annular heating sleeve (10).

10. The explosive charge reaction threshold measuring device based on thermal-compression-shear coupling as described in claim 3, characterized in that, The sleeve (1), lower striking post (2), upper striking post (7) and pressure-acting end cap (8) are all made of metal.

Images