CN115876606A - Bullet impact explosive loading compression shear test device and design method - Google Patents
Bullet impact explosive loading compression shear test device and design method Download PDFInfo
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Abstract
The invention provides an explosive loading compression shearing process simulation test device under bullet impact and a design method thereof, wherein a punching shear pressure head is arranged in a sleeve, the simulation test device also comprises a fixing ring and a baffle plate, the fixing ring is sleeved in the sleeve, two ends of the fixing ring are respectively provided with a first through hole and a second through hole, an explosive column is filled in the second through hole, the baffle plate is fixedly sleeved in the sleeve and connected with one side of the fixing ring provided with the second through hole to plug the explosive column, one end of the punching shear pressure head can penetrate into the first through hole and is contacted with the explosive column, explosives around an impact point in the impact compression shearing process have no axial displacement and are more close to the compression shearing load characteristic of the explosive loading under the constraint condition after a warhead shell is locally perforated under the impact action of real bullet impact, the explosive column can not generate impact again to ignite after receiving the impact, the test result is not mixed up, and the device is more close to the stress condition of the real bullet impact explosive loading compression shearing, and the accuracy of the test result is effectively improved.
Description
Technical Field
The invention belongs to the field of explosive and powder testing devices, and particularly relates to a bullet impact explosive loading compression shear testing device and a design method.
Background
With the increasing complexity of the environment in which weapon systems are used and the large number of high-value weapons are used in the battlefield, the requirements for the survivability of weapons are increasing. Bullet impact is one of the most common threats in modern battlefields, and the bullet impact test is an indispensable assessment item in the currently most authoritative low-vulnerability ammunition risk assessment test standards (MIL-STD 2105D in the United states and STANAG 4439-2-10 in North York). The bullet impact test usually adopts a method of intercepting a typical structure of a bullet body for testing, but the loading amount is generally in a kilogram magnitude, so that the test cost, the safety and other factors are considered, a simulation test device capable of simulating the compression shear load borne by the loaded bullet body under the impact action of a real bullet needs to be established, and a basis is provided for the safety research of evaluating the full-size loaded bullet body.
Under the impact action of a bullet, explosive charges are generally difficult to directly impact and detonate, and deformation damage and even ignition reaction occur inside the explosive charges due to compression, shearing, friction and other complex stress states after the bullet penetrates through a shell. In Tianxuan et al, the dynamic response characteristic of explosive under shear loading of explosive containing AP (explosive article, 2-15,38 (3): 69-72) is studied by using a small drop hammer loading device and a self-designed shear loading device, the loading principle is that a pressing block is impacted by a free falling body of a drop hammer to push an explosive column to move downwards integrally, and the explosive column moves continuously because a preset shear die can prevent the central explosive from moving downwards and the peripheral explosive columns move continuously, so that the explosive column generates relative displacement and forms high-speed shear. However, the method for simulating the forced process of explosive loading under the impact action of the bullet has the following two problems: (1) In the loading process, the explosive columns integrally move downwards, the explosive columns around the shearing die have inertia force, and because the lower surfaces of the peripheral explosive columns are not axially constrained, when the shearing die extrudes the central explosive column, the explosive columns shear and flow to enable the peripheral explosive columns to axially move, and the motion state of the explosive columns is different from the motion state of real explosive charges under the constraint of the shell; (2) Because the explosive column is likely to be partially broken in the shearing process, and a step is arranged below the shearing die, the broken explosive column is impacted again and is easy to ignite, and at the moment, whether the ignition reaction of the explosive is directly caused by the shearing action cannot be distinguished, so that the real critical ignition threshold of explosive charging is difficult to obtain.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a bullet impact explosive charging compression shear test device and a design method thereof, and solve the problems in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a simulation test device for explosive loading compression shearing process under bullet impact comprises a sleeve and a punching and shearing pressure head, wherein the punching and shearing pressure head is arranged in the sleeve,
still including solid fixed ring and baffle, gu fixed ring cover locates in the sleeve, gu fixed ring both ends set up first through-hole and second through-hole respectively, pack the explosive powder column in the second through-hole, the fixed cover of baffle is located in the sleeve and is connected the explosive powder column shutoff with solid fixed ring one side that sets up the second through-hole, and punching shear pressure head one end can go deep into first through-hole and contact with the explosive powder column.
Preferably, the explosive charge compression shear process simulation test device under bullet striking still includes:
the gasket is arranged on one side, close to the first through hole, in the fixing ring, a third through hole is formed in the gasket, the third through hole is matched with the first through hole, and one end of the punching and shearing pressure head can penetrate into the third through hole of the gasket.
The fixed step is arranged in the sleeve, the fixed ring is arranged on the fixed step, and the fixed step is used for preventing the fixed ring from moving towards one side of the punching shear pressure head in the sleeve.
Preferably, the explosive charge compression shear process analogue test device still includes under the bullet striking:
the upper impact column and the lower impact column are sleeved on the sleeve, one end of the upper impact column is connected with the punching shear pressure head, and the other end of the upper impact column extends out of the sleeve; one end of the lower striking column is connected with the baffle, and the other end of the lower striking column extends out of the sleeve.
Preferably, the sleeve side wall is provided with a pressure relief hole, the pressure relief hole is located between the punching shear pressure head and the fixing ring, the punching shear pressure head is provided with a boss, the boss can extend into the first through hole, and the pressure relief hole is communicated with the groove on one side of the boss.
Preferably, the center lines of the upper striking column, the punching shear pressure head, the fixing ring, the gasket, the explosive column, the baffle and the lower striking column are coaxially arranged.
Preferably, the ratio of the vertical length of the upper striking column to the vertical length of the sleeve is 0.5-0.7; the ratio of the vertical length of the lower striking column to the vertical length of the sleeve is 0.25-0.40; the ratio of the vertical length of the punching shear pressure head to the vertical length of the sleeve is 0.2-0.4, the vertical length of the boss is 10-15 mm larger than the sum of the vertical lengths of the first through hole and the gasket, and the ratio of the diameter of the boss to the diameter of the upper striking column is 0.15-0.25.
A design method of a simulation test device for an explosive loading compression shearing process under bullet impact comprises the following specific steps:
s10: according to the allowable explosive amount in the laboratory, the equivalent weight of the explosive used in the test and the strength of the test protection device, the mass m of the explosive column is estimated 5 ；
S20: according to mass m of explosive 5 Determining the diameter d of the explosive column 5 Length l of explosive column 5 Diameter of explosive column d 5 Length l of explosive column 5 Designing according to a proportion;
s30: the outer radius R of the fixing ring is estimated according to the elastic theory of the thick-wall cylinder 3 ；
S40: selecting the diameter d of the lug boss of the punching shear pressure head by combining the size of the explosive column and the actual bullet diameter 2 ；
S50: determining the wall thickness t on the fixing ring by adopting a geometric scaling method according to the actual warhead shell thickness 3 ；
S60: according to the upper wall thickness t of the fixing ring 3 And gasket thickness t 4 Determining the length l of a boss of a punching shear pressure head 22 Length l of press head of punching shear 2 And a length l of the fixing ring 3 ；
S70: according to the length l of the punching shear pressure head 2 And length l of the fixing ring 3 Determining the length l of the sleeve 8 ：
S80: determining the length l of the upper striking cylinder 1 And lower impact column length l 7 。
Preferably, the explosive column diameter d 5 Length l of explosive column 5 Comprises the following steps:
wherein d is 5 Is the diameter of explosive column, unit: mm; l. the 5 Is the length of explosive column, unit: mm; m is a unit of 5 The mass of the explosive column is as follows: g;
outer radius R of the fixing ring 3 ：
Wherein R is 3 Outer radius of the retaining ring, unit: mm; sigma max Is the dynamic compressive peak stress of the explosive; epsilon 0 For maximum elastic deformation of the retaining ring material, 0.002 is usually taken; e is the modulus of elasticity of the retaining ring material.
Preferably, the shear head boss diameter d 2 ：
Wherein, d 2 For the shearing head boss diameter, unit: mm;
the length l of the boss of the shearing and pressing head 22 ：
l 22 ＝t 3 +t 4 +Δ
Wherein, delta is punching shear pressureMaximum depth of the head pressed into the explosive column, unit: mm; t is t 3 The upper wall thickness of the fixing ring is unit mm; t is t 4 Is the gasket length, unit: mm;
length l of the sleeve 8 ：
l 8 ≈2(l 2 +l 3 )
l 2 ＝2.5～3.5(l 22 )
l 3 ＝t 3 +t 4 +l 5
Length l of the upper striking column 1 ：
Length l of the lower striking column 7 ：
Wherein,
the distance from the upper surface of the sleeve to the center of the pressure relief hole, unit: mm;
For the distance of sleeve lower surface to pressure release hole central point, the unit: mm; l. the 21 The length of a cylindrical section of a punching shear pressure head; l. the 3 For the length of the retaining ring, unit: mm; l 6 Is the length of the baffle, unit: mm; h is 1 The unit of the overhanging length of the upper striking column is: mm; h is 7 The overhanging length of the lower striking column is shown in unit: mm.
Compared with the prior art, the invention has the following technical effects:
the device and the design method thereof have the advantages that the fixing ring is arranged in the sleeve, the explosive columns are arranged in the first through holes of the fixing ring and can be fixed through the baffle, when the impact shear pressure head impacts the explosive columns through the first through holes, the explosives around the impact points do not have axial displacement in the impact compression shearing process, under the impact action of real bullets, the explosive charges are subjected to compression shear load characteristics under the constraint condition after the local perforation of the shell of the warhead part, the explosive columns are broken after impact, ignition cannot occur to cause confusion of test results due to secondary impact, the device is closer to the compression shear stress state of the explosive charges when the real bullets impact the warhead part, and the accuracy of the test results is effectively improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the test apparatus of the present invention;
FIG. 2 is a schematic structural view of the sleeve of the present invention;
FIG. 3 is a schematic view of the retaining ring of the present invention;
figure 4 is a schematic diagram of the construction of the punch shear ram of the present invention.
The meaning of the individual reference symbols in the figures is:
1. the explosive cartridge comprises an upper impact column, 2 parts of a punching shear pressure head, 2-1 parts of a boss, 3 parts of a fixing ring, 3-1 parts of a first through hole, 3-2 parts of a second through hole, 4 parts of a gasket, 5 parts of an explosive column, 6 parts of a baffle, 7 parts of a lower impact column, 8 parts of a sleeve, 9 parts of a fixing step, 10 parts of a pressure relief hole.
The present invention will be explained in further detail with reference to examples.
Detailed Description
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
As used herein, directional terms such as "diameter", "radial" and "vertical" are intended to correspond to a particular direction on the page in the drawings or to a corresponding direction in space as illustrated in the drawings.
The lengths mentioned herein are the lengths of the respective parts in the vertical direction
Example 1:
the utility model provides an explosive charge compression shear process analogue test device under bullet striking, include sleeve 8 and impact shear pressure head 2, impact shear pressure head 2 locates in the sleeve 8, still include solid fixed ring 3 and baffle 6, gu fixed ring 3 overlaps locates in the sleeve 8, gu fixed ring 3 both ends set up first through-hole 301 and second through-hole 302 respectively, pack explosive cartridge 5 in the second through-hole 302, 6 fixed cover of baffle is located in the sleeve 8 and is connected 5 shutoff with explosive cartridge with solid fixed ring 3 one side that sets up second through-hole 302, impact shear pressure head 2 one end can be deep into first through-hole 301 and contact with explosive cartridge 5.
The device of this embodiment, through set up solid fixed ring in the sleeve, locate the explosive cartridge in solid fixed ring's first through-hole, the accessible baffle is fixed the explosive cartridge, when the impact shear pressure head passes through first through-hole striking explosive cartridge, there is not axial displacement in impact compression shearing in-process striking point explosive all around, more be close under the effect of true bullet striking, the compression shear load characteristic of explosive powder charge under the restraint condition after the casing part is perforated, and the explosive cartridge can not take place to ignite because of secondary striking and bring the confusion to the test result after receiving the striking, the device of the invention is the rate of accuracy of effectual promotion test result.
The explosive in this example is a PBX polymer bonded explosive with a density of about 1.80g/cm 3 The baffle is made of polyethylene, the punching shear pressure head is made of T10A steel, and the sleeve 8 and the fixing ring are made of T10A steel.
As a preferable scheme of this embodiment, the explosive charge compression shear process simulation test device under the impact of the bullet further includes:
the packing ring 4, the packing ring 4 is located the one side that is close to first through-hole 301 in the solid fixed ring 3, establishes the third through-hole in the packing ring 4, and the third through-hole matches with first through-hole 301, and 2 one end of punching shear pressure head can go deep into in the 4 third through-holes of packing ring.
Wherein, packing ring 4 is used for preventing the explosive column border from taking 1mm about with the experimental precision of solid fixed ring metal contact surface extrusion initiation in advance, influence this embodiment device, and its thickness is usually got, and the material must be non-metallic material, and packing ring 4 thickness (vertical length) is 1mm in this embodiment, and the material is polyethylene.
As a preferable scheme of this embodiment, a fixing step 9 is provided in the sleeve 8, the fixing ring 3 is provided on the fixing step 9, and the fixing step 9 is used to prevent the fixing ring 3 from moving toward the punching and shearing head 2 side in the sleeve 8.
Wherein, fixed step 9 is used for the restriction to strike the in-process because the solid fixed ring 3 upward movement that leads to when the explosive charge warp because of reaction force, can guarantee the restraint effect of solid fixed ring 3 to the explosive charge among the whole loading process, avoids producing axial displacement by the explosive around the 2 bosss of deformation in-process impact shear pressure head, is more close the compression shear load characteristic of explosive charge under the restraint condition after the local perforation of projectile body under the real bullet striking effect, further promotes the test efficiency of this embodiment.
As a preferable scheme of this embodiment, the explosive charge compression shear process simulation test device under the impact of the bullet further includes:
the upper impact column 1 and the lower impact column 7, the upper impact column 1 and the lower impact column 7 are both sleeved on a sleeve 8, one end of the upper impact column 1 is connected with the punching shear pressure head 2, and the other end of the upper impact column extends out of the sleeve 8; one end of the lower striking column 7 is connected with the baffle 6, and the other end extends out of the sleeve 8.
The upper striking column 1 and the lower striking column 7 are made of T10A steel, and the upper striking column 1 and the lower striking column 7 are used for transmitting load.
As a preferable scheme of this embodiment, a pressure relief hole 10 is formed in a side wall of the sleeve 8, the pressure relief hole 10 is located between the punching and shearing pressure head 2 and the fixing ring 3, a boss 2-1 is arranged on the punching and shearing pressure head 2, the boss 2-1 can extend into the first through hole 301, and the pressure relief hole 10 is communicated with a groove on one side of the boss 2-1.
Wherein, accessible laser velocimeter measures bullet impact velocity during experiment, and the pressure release hole on the sleeve can guarantee to go up to hit the influence that post motion in-process does not receive air compression resistance in the airtight space, if the powder column takes place the reaction, the high-pressure gas result of production also can be followed the pressure release hole and discharged to make it more be close the effect process that the ammunition security appraised bullet strikeed in the experiment, further promote the experimental precision of this embodiment device.
The boss structure can stretch into first through-hole 301 and be favorable to promoting the motion of explosive column, and pressure release hole 10 communicates with each other with the recess of boss 2-1 one side, is favorable to high-pressure gas to discharge from the pressure release hole, and the pressure release hole diameter adopts 10mm in this embodiment.
As a preferred scheme of this embodiment, the central lines of the upper striking column 1, the punching shear pressure head 2, the fixing ring 3, the gasket 4, the explosive column 5, the baffle 6 and the lower striking column 7 are coaxially arranged, so that the working stability of the experimental device of this embodiment can be improved, and the accuracy of the test can be improved.
As a preferable scheme of the embodiment, the ratio of the vertical lengths of the upper striking column 1 and the sleeve 8 is 0.5-0.7; the vertical length ratio of the lower striking column 7 to the sleeve 8 is 0.25-0.40; the ratio of the vertical lengths of the punching shear pressure head 2 and the sleeve 8 is 0.2-0.4, the vertical length of the boss 2-1 is 10-15 mm greater than the sum of the vertical lengths of the first through hole 301 and the gasket 4, and the ratio of the diameter of the boss 2-1 to the diameter of the upper striking column 1 is 0.15-0.25.
Wherein, the vertical length of the upper striking column 1 is: 90mm, the vertical length of sleeve 8 is 160mm, and the vertical length of lower hitting post 7 is: 50mm, the vertical length of the punching shear pressure head 2 is as follows: 46mm.
The boss diameter is 10mm, and the boss (the biggest displacement of impressing in the powder column) height is 10mm, and 3 wall thickness (the vertical length of first through-hole) of solid fixed ring are 5mm.
In the embodiment, a first-stage light gas gun is adopted to drive 2kg of polyethylene shot, the shot 1 is impacted at different speeds to load the PBX press-fitting explosive column, the shot impact speed is measured through a laser speed measuring system of the first-stage light gas gun during the test, the shot impact speed is gradually increased, when the shot speed is increased to 320m/s, the ignition reaction of the PBX press-fitting explosive column occurs, the critical shear speed of the PBX explosive is about 320m/s, the ignition reaction of the PBX press-fitting explosive column occurs by adopting the conventional device, other conditions are unchanged, when the shot speed is increased to 260m/s, the ignition reaction of the PBX press-fitting explosive column occurs, therefore, the influence caused by axial displacement around an impact point in the impact compression shear process is reduced, the ignition is not caused by the secondary impact of the broken explosive column after the impact, the confusion of the test result is avoided, and the test accuracy of the device is further improved.
The working and using process of the embodiment is as follows:
the upper impact column 1 and the punching shear pressure head 2 are sequentially arranged at one end of the sleeve 8 from top to bottom; assembling the fixing ring 3 provided with the gasket 4 at the other end of the sleeve 8, wherein a first through hole of the fixing ring 3 faces to a boss of the punching and shearing pressure head 2, and penetrating the boss of the punching and shearing pressure head 2 into the fixing ring 3 and the gasket 4; installing an explosive column 5 in the second through hole, wherein the upper surface of the explosive column is tightly contacted with the gasket 4 and the surface of the boss, and the lower surface of the explosive column is flush with the bottom surface of the fixing ring 3; and finally, sequentially installing a baffle 6 and a lower striking column 7, ensuring that the upper striking column 1, the punching shear pressure head 2, the fixing ring 3, the gasket 4, the explosive column 5, the baffle 6 and the lower striking column 7 are coaxially installed, enabling the upper edge of the fixing ring 3 to be in close contact with a fixed step of a sleeve 8, driving 2kg of polyethylene shot by adopting a first-stage light gas gun, and gradually increasing the speed to impact the upper striking column 1 to load the PBX press-mounting explosive column.
Example 2:
s10: according to the allowable explosive amount in the laboratory, the equivalent weight of the explosive used in the test and the strength of the test protection device, the mass m of the explosive column is estimated 5 (ii) a In the embodiment, a first-level light gas gun loading device is adopted for testing, the allowable dosage is 60g of TNT, the explosive used in the test of the embodiment is PBX press-fit explosive, the equivalent weight of the TNT is 1.5 times, and the maximum mass of the PBX explosive in the test is 40g;
s20: according to mass m of explosive 5 Determining the size of an explosive column, wherein the length-diameter ratio of the explosive column is 1, and the diameter d of the explosive 5 Length l 5 Is composed of
Density rho of PBX explosive used 5 Is 1.80g/cm 3 The diameter of the explosive is not more than 30.48mm according to the calculation of the allowable amount of the drug in a laboratory, the unit number in the embodiment is rounded, and the diameter d of the explosive column 5 And length l 5 All are 30mm.
S30: the outer radius R of the fixing ring is estimated according to the elastic theory of the thick-wall cylinder 3 ：
Wherein:σ max is the dynamic compressive peak stress of the explosive; epsilon 0 To maximize elastic deformation of the retaining ring material, 0.002 is typically taken; e is the modulus of elasticity of the retaining ring material. Dynamic compressive peak stress sigma of PBX explosive in this example max About 160MPa, T10A as the material of the fixed ring, 210GPa as the elastic modulus E, and R obtained through calculation 3 ≥1.46×d 5 The/2 =19.91mm, the outer diameter of the fixing ring is 20mm in the embodiment;
s40: selecting the diameter d of the lug boss of the punching shear pressure head by combining the size of the explosive column and the actual bullet diameter 2 ，
Considering that the standard test of the impact safety of the warhead bullet is to use a 12.7mm armor piercing bomb for impact, and the diameter of the explosive column is 30mm in the embodiment, here the diameter d of the punching shear pressure head boss 2 Selecting the thickness as 10mm;
s50: determining the wall thickness t on the fixed ring by adopting a geometric scaling method according to the actual warhead shell thickness 3 (ii) a In the embodiment, the wall thickness of the warhead is 35mm, the radius of the payload of the warhead is 110mm, and the wall thickness t on the fixing ring is obtained through calculation 3 Is 5mm;
s60: according to the upper wall thickness t of the fixing ring 3 And gasket thickness t 4 Determining the length l of the boss of the punching shear pressure head 22 ：
l 22 ＝t 3 +t 4 +Δ
Wherein: and delta is the maximum depth of the punching shear pressure head pressed into the explosive column. Gasket thickness t in the present embodiment 4 1mm, the maximum depth of the punching shear pressure head pressed into the explosive column is 10mm, and the height l of the boss of the punching shear pressure head 22 Is 16mm; length l of punching shear head 2 About the length l of the boss of the punching shear pressure head 22 2.5-3.5 times of the length of the punching shear pressure head l in the embodiment 2 Is 46mm;
s70: according to the length l of the punching shear pressure head 2 And length l of the fixing ring 3 Determining the length l of the sleeve 8 Length l of said fixing ring 3 For securing the ring upper wall thickness t 3 Thickness t of the gasket 4 Length l of explosive column 5 And (4) summing. Length l of the fixing ring in this embodiment 3 Is 5+1+30=36mm, and the length l of a punching shear pressure head 2 46mm, the height of the sleeve is 160mm;
s80: determining the length l of the upper striking column 1 And lower impact column length l 7 Height of upper striking column l 1 Height of sleeve 8 The ratio of the lower striking height to the upper striking height is about 0.5-0.7 7 Height of sleeve 8 The ratio of about 0.25 to about 0.40; l 6 The length of the baffle is 3 mm-5 mm, the height of the upper striking column in the embodiment is 90mm, and the height of the lower striking column is 50mm.
According to the test device designed by the design method, the explosives around the impact point do not have axial displacement in the impact compression shearing process, the compression shear load characteristic of the explosive loaded under the constraint condition after the shell is locally perforated is more approximate to the impact action of a real bullet, the explosive column is broken after being impacted, the ignition cannot happen again, and the confusion of the test result is caused, so that the accuracy of the test result is effectively improved.
Claims (10)
1. A simulation test device for explosive loading compression shearing process under bullet impact comprises a sleeve (8) and a punching shear pressure head (2), wherein the punching shear pressure head (2) is arranged in the sleeve (8),
still including solid fixed ring (3) and baffle (6), gu fixed ring (3) cover is located in sleeve (8), gu fixed ring (3) both ends set up first through-hole (301) and second through-hole (302) respectively, pack explosive charge (5) in second through-hole (302), baffle (6) fixed cover is located in sleeve (8) and is connected explosive charge (5) shutoff with solid fixed ring (3) one side that sets up second through-hole (302), ram shear pressure head (2) one end can go deep into first through-hole (301) and contact with explosive charge (5).
2. The explosive charge compression shear process simulation test device under bullet impact of claim 1, wherein the explosive charge compression shear process simulation test device under bullet impact further comprises:
the gasket (4), one side that is close to first through-hole (301) in solid fixed ring (3) is located in gasket (4), establishes the third through-hole in gasket (4), and the third through-hole matches with first through-hole (301), and punching shear pressure head (2) one end can go deep into in gasket (4) third through-hole.
3. The explosive charge compression shear process simulation test device under bullet impact of claim 1, characterized in that a fixed step (9) is arranged in the sleeve (8), the fixed ring (3) is arranged on the fixed step (9), and the fixed step (9) is used for preventing the fixed ring (3) from moving towards one side of the impact shear ram (2) in the sleeve (8).
4. The explosive charge compression shear process simulation test apparatus under bullet impact of claim 1, wherein the explosive charge compression shear process simulation test apparatus under bullet impact further comprises:
the upper striking column (1) and the lower striking column (7), the upper striking column (1) and the lower striking column (7) are sleeved on the sleeve (8), one end of the upper striking column (1) is connected with the punching shear pressure head (2), and the other end of the upper striking column extends out of the sleeve (8); one end of the lower striking post (7) is connected with the baffle (6), and the other end extends out of the sleeve (8).
5. The explosive charge compression shear process simulation test device under bullet impact according to claim 1, wherein a pressure relief hole (10) is formed in the side wall of the sleeve (8), the pressure relief hole (10) is located between the punching shear ram (2) and the fixing ring (3), a boss (2-1) is arranged on the punching shear ram (2), the boss (2-1) can extend into the first through hole (301), and the pressure relief hole (10) is communicated with a groove on one side of the boss (2-1).
6. The explosive charge compression shear process simulation test device under bullet impact according to claim 1, characterized in that the center lines of the upper impact column (1), the impact shear ram (2), the fixing ring (3), the gasket (4), the explosive column (5), the baffle (6) and the lower impact column (7) are coaxially arranged.
7. The apparatus for simulating the compression shear process of an explosive charge under impact of a bullet according to claim 4, wherein the ratio of the vertical length of the upper striking pin (1) to the vertical length of the sleeve (8) is 0.5 to 0.7; the ratio of the vertical length of the lower striking column (7) to the vertical length of the sleeve (8) is 0.25-0.40; the ratio of the vertical lengths of the punching shear pressure head (2) and the sleeve (8) is 0.2-0.4, the vertical length of the boss (2-1) is 10-15 mm greater than the sum of the vertical lengths of the first through hole (301) and the gasket (4), and the ratio of the diameter of the boss (2-1) to the diameter of the upper striking column (1) is 0.15-0.25.
8. A design method of a simulation test device for an explosive loading compression shearing process under bullet impact is characterized by comprising the following specific steps:
s10: according to the allowable explosive amount in the laboratory, the equivalent weight of the explosive used in the test and the strength of the test protection device, the mass m of the explosive column is estimated 5 ；
S20: according to mass m of explosive 5 Determining the diameter d of the explosive column 5 Length l of explosive column 5 Diameter d of explosive column 5 Length l of explosive column 5 Designing according to a proportion;
s30: the outer radius R of the fixing ring is estimated according to the elastic theory of the thick-wall cylinder 3 ；
S40: selecting the diameter d of the lug boss of the punching shear pressure head by combining the size of the explosive column and the actual bullet diameter 2 ；
S50: determining the wall thickness t on the fixed ring by adopting a geometric scaling method according to the actual warhead shell thickness 3 ；
S60: according to the upper wall thickness t of the fixing ring 3 And a gasket thickness t 4 Determining the length l of a boss of a punching shear pressure head 22 Length l of press head of punching shear 2 And a length l of the fixing ring 3 ；
S70: according to the length l of the punching shear pressure head 2 And length l of the fixing ring 3 Determining the length l of the sleeve 8 ：
S80: determining the length l of the upper striking cylinder 1 And lower impact column length l 7 。
9. A method of designing an explosive charge compression shear process simulation test apparatus upon impact of a bullet as in claim 8 wherein said explosive column diameter d 5 Length l of explosive column 5 Comprises the following steps:
wherein d is 5 Is the diameter of explosive column, unit: mm; l 5 Is the length of explosive column, unit: mm; m is 5 The mass of the explosive column is as follows: g;
outer radius R of the fixing ring 3 ：
Wherein R is 3 Outer radius of the retaining ring, unit: mm; sigma max Is the dynamic compressive peak stress of the explosive; epsilon 0 For maximum elastic deformation of the retaining ring material, 0.002 is usually taken; and E is the elastic modulus of the material of the fixed ring.
10. The method of designing an explosive charge compression shear process simulation test device under impact of a bullet according to claim 9, wherein the shear head boss diameter d 2 ：
Wherein d is 2 For the shearing head boss diameter, unit: mm;
shearing and pressing head boss length l 22 ：
l 22 ＝t 3 +t 4 +Δ
Wherein, delta is the maximum depth of the punching shear pressure head pressed into the explosive column, and the unit is as follows: mm; t is t 3 The upper wall thickness of the fixing ring is unit mm; t is t 4 Is the gasket length, in units: mm;
length l of the sleeve 8 ：
l 8 ≈2(l 2 +l 3 )
l 2 ＝2.5～3.5(l 22 )
l 3 ＝t 3 +t 4 +l 5
Length l of the upper striking column 1 ：
Length l of the lower striking column 7 ：
Wherein,
the distance from the upper surface of the sleeve to the center of the pressure relief hole, unit: mm;
For the distance of sleeve lower surface to pressure release hole central point, the unit: mm; l 21 The length of a cylindrical section of a punching shear pressure head; l 3 For the length of the retaining ring, unit: mm; l 6 Is the length of the baffle, unit: mm; h is 1 The unit of the overhanging length of the upper striking column is: mm; h is 7 The overhanging length of the lower striking column is shown in unit: mm. />
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211199490.3A CN115876606A (en) | 2022-09-29 | 2022-09-29 | Bullet impact explosive loading compression shear test device and design method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211199490.3A CN115876606A (en) | 2022-09-29 | 2022-09-29 | Bullet impact explosive loading compression shear test device and design method |
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