Explosion structure for realizing fixed-layer / fixed-depth explosion without fuze charge

Abstract

The invention discloses an explosion structure for realizing fixed-layer / fixed-depth explosion without fuze charge. According to the invention, the active core body is arranged in the penetration rod body to form an explosion damage section of an explosion structure; the part, not internally provided with the active core body, in the penetration rod body forms a penetration damage section of the explosion structure; by adjusting the positions and the number of the explosion damage sections and the penetration damage sections and the activation threshold value of the active core body, fixed-layer / fixed-depth damage to the target plate is achieved. Under the condition that fuses and explosives are not contained, fixed-layer / fixed-depth explosion damage to a multi-layer large ship target can be achieved on the basis of the non-self-sustaining activation explosion characteristic of the active material, the influence limitation of high overload in the launching and target hitting process on fuses and charging of a traditional explosion structure is broken through, and the explosion effect of the multi-layer large ship target is improved. And an effective technical approach is provided for efficiently and reliably exerting the fixed-layer / fixed-depth damage effect of the high-speed / high-landing-speed missile warhead.

Description

Technical Field

[0001] The present invention relates to the technical field of explosive structures, and in particular to an explosive structure that does not contain a fuze charge and can achieve fixed-layer / fixed-depth explosion. The explosive structure can be adapted to high-flying-speed / high-impact-speed missile weapon platforms, eliminate the adverse effects of high-overload environments on traditional explosive structure fuzes and explosives during the process of attacking large ships and building targets, improve the reliability of the explosive structure's fixed-layer / fixed-depth damage, and promote the multi-purpose development of the explosive structure. Background Art

[0002] The explosive structure is the main type of structure for attacking multi-layer large ship targets, mainly composed of high-strength metal shells, high-energy explosive charges, fuses, etc. The basic working principle is that the explosive structure relies on kinetic energy to penetrate the target, and through the layer counting / timing function of the fuse, after penetrating a certain number of layers of the target structure or penetrating to a certain depth of the target, the high-energy explosive charge is detonated to cause fixed-layer / fixed-depth damage to a specific compartment or structural area.

[0003] With the improvement of anti-missile interception technology and terminal target protection performance, the terminal ballistic speed of the explosive structure is constantly increasing. Traditional explosive structures are facing two severe technical challenges. First, the flight speed and falling speed of the platform carrying the explosive structure weapon are constantly developing towards supersonic and hypersonic speeds. Due to the viscous resistance and friction of the air, the explosive structure produces a strong aerodynamic heating effect. While the surface temperature of the explosive structure rises sharply, its internal charge is also subjected to a harsh thermal environment under the action of heat conduction, which may cause the internal charge to be unstable and cause premature explosion; second, due to the high overload during the penetration process, the reliable timing / layer / depth detonation of the fuze is easily affected by extreme overload during the process of acting on the target. The above two shortcomings limit the performance of the efficient terminal damage power and multi-purpose application of the existing explosive structure.

[0004] Active materials are a new type of high-energy-density energetic material with typical characteristics of "quasi-inert insensitivity, quasi-explosive energetics, micro-millisecond activation delay, and non-self-sustaining explosive energy release". In a broad sense, active materials include polymeric, chemical, alloy, amorphous and other material systems. Under normal conditions, they are in an inert metastable state with good mechanical properties; but under strong impact loading, they will be activated to undergo chemical reactions, rapidly and violently releasing a large amount of chemical energy, producing shock waves, heat, combustion and other effects. This has laid an important technical foundation for the transformation of traditional invasive explosive structures to a non-fuze, non-charge technology system.

[0005] By breaking the traditional basic structure and action system of explosives, combining the extreme speed and load characteristics of the explosive structure projectile, and inventing a new explosive structure, it can provide an effective technical approach for fixed-layer / fixed-depth damage effects. Summary of the invention

[0006] In view of this, the present invention provides an explosive structure that does not contain a fuze charge and can achieve fixed-layer / fixed-depth explosion. It can adapt to high-flying-speed / high-impact-speed missile weapon platforms, eliminate the adverse effects of high-overload environments on traditional explosive structure fuses and explosives in the process of acting on large ships and building targets, improve the reliability of fixed-layer / fixed-depth damage of the explosive structure, and promote the multi-purpose development of the explosive structure.

[0007] The explosive structure for realizing fixed layer / fixed depth explosion without fuze charge of the present invention comprises: a wind cap, a posture adjustment cap, a penetration rod body, a confining pressure peak cutting structure and an active core body;

[0008] Among them, the wind cap and the attitude adjustment cap are installed on the head of the penetration rod body to achieve the attitude adjustment of the penetration structure when it hits the target;

[0009] The active core is built into the penetrating rod to form an explosive damage section of the penetrating structure; the part of the penetrating rod without the active core built into it forms the penetrating damage section of the penetrating structure; based on the fixed layer / deep damage target of the target plate, the position and number of the explosive damage section and the penetrating damage section are adjusted; when there are multiple explosive damage sections, the activation threshold of the built-in active core decreases from the head to the tail of the penetrating rod;

[0010] The confining pressure peak-cutting structure is wrapped around the outside of the active core, and is used to form a confining pressure constraint on the active core and reduce the peak short-time load generated by the penetrating rod during the penetration of the target into a low-peak long-time load.

[0011] Preferably, a weak groove is prefabricated on the outer circumference of the penetration rod body.

[0012] Preferably, the weakened groove is a V-shaped groove, a sawtooth groove or a rectangular groove.

[0013] Preferably, the length of the weak slot engraved on the rod body is L = min [L 1 ,L 2 ],in,

[0014] L 1 =-(1 / α)ln(P c / P 0 )

[0015]

[0016] Among them, α is the coefficient related to the material properties of the penetrating rod, ρ f , P f , U f and ρ t , P t , U t It is the density, pressure and wave speed of the shock wave penetrating the rod body and target plate material after transmission.

[0017] Preferably, the penetration rod has a tensile strength of not less than 1000MPa and an impact energy of not less than 30J / cm 2 , made of high entropy alloy with an elongation at break of not less than 8%.

[0018] The optimal confining pressure peak-cutting structure adopts a compression rate of not less than 20% and an energy absorption density of not less than 150MJ / m 3 Made of metal material.

[0019] Preferably, the outer diameter of the confining pressure peak-cutting structure is 0.7 to 0.9 times the outer diameter of the penetration rod; the thickness h of the confining pressure peak-cutting structure satisfies:

[0020] P=(1+λ)P 0 exp(-αh)

[0021] Where P is the pressure transmitted into the active material; λ is the activation factor of the active core in the confining pressure peak-cutting structure; P 0 is the pressure of the shock wave at the pressure-cutting peak structure; α is the shock wave attenuation coefficient, which is related to the material of the confining pressure-cutting peak structure.

[0022] Preferably, when there are multiple explosion damage sections, the high-threshold active core adopts a high-energy and highly insensitive polymer-based fluoropolymer active material with a theoretical energy content of not less than 7MJ / kg and an activation threshold greater than 2GPa; the low-threshold active core adopts a high-energy sensitized polymer-based fluoropolymer active material with a theoretical energy content of not less than 7MJ / kg and an activation threshold less than 900MPa.

[0023] Preferably, the activation threshold of the active material is determined according to the projectile-target action conditions, satisfying the following relationship:

[0024] P p =ρ 0p [c 0 +s p (vu t )](vu t )exp(-δl)

[0025] Among them, P p is the internal pressure of the active material, ρ 0p is the initial density of the explosion structure, c 0 is the sound velocity of the active material, s p is the empirical coefficient, v is the speed at which the explosive structure collides with the target plate, and u t is the particle velocity in the target plate, δ is the equivalent shock wave attenuation factor, and l is the equivalent shock wave attenuation length.

[0026] Beneficial effects:

[0027] The active explosive structure of the present invention, through the mutual combination of a high-threshold active core, a low-threshold active core, a high-entropy alloy penetration rod and a confining pressure peak-cutting structure, can, without the presence of fuses or explosives, achieve fixed-layer / fixed-depth explosive damage to multi-layer large ship targets based on the non-self-sustaining activation explosion characteristics of active materials, breaking through the limitations of the influence of high overloads during launch and impact on the fuses and charges of traditional explosive structures, and providing an effective technical approach for high-speed / high-impact speed explosive structures to efficiently and reliably exert fixed-layer / fixed-depth damage effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 In order to penetrate six target plates, it is necessary to produce layer-specific damage between the 1st-2nd and 5th-6th target plates, and the schematic diagram of the explosion structure of the present invention.

[0029] Figure 2 In order to penetrate six layers of target plates, it is necessary to produce layer-specific damage between the 4th-5th and 5th-6th target plates, and the schematic diagram of the explosion structure of the present invention.

[0030] Figure 3 It is a schematic diagram of the hood structure of the present invention.

[0031] Figure 4 It is a schematic diagram of the posture-adjusting quilt cap structure of the present invention.

[0032] Figure 5 It is a schematic diagram of the confining pressure peak cutting structure in the present invention.

[0033] Figure 6 It is a schematic diagram of the high threshold active core structure in the present invention.

[0034] Figure 7 It is a schematic diagram of the low threshold active core structure of the present invention.

[0035] Figure 8 It is a schematic diagram of the penetrating rod structure in the present invention.

[0036] Fig. 9 The figure shows that when penetrating six target plates, it is necessary to produce fixed layer damage between the 1st-2nd and 5th-6th target plates. Figure 1 The effect of layer-specific damage on the structure shown.

[0037] Fig.10 The figure shows that when penetrating six target plates, it is necessary to produce fixed layer damage between the 4th-5th and 5th-6th target plates. Figure 2 The effect of layer-specific damage on the structure shown.

[0038] Among them, 1- wind cap, 2- posture adjustment cap, 3- penetration rod body, 4- confining pressure peak clipping structure, 5- high threshold active core, 6- low threshold active core. DETAILED DESCRIPTION

[0039] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0040] The present invention provides an explosive structure for realizing fixed layer / fixed depth explosion without a fuze charge, comprising a wind cap 1, a posture adjustment cap 2, a penetration rod body 3, a confining pressure peak cutting structure 4 and an active core body;

[0041] The penetration rod body 3 is a cylindrical body with a large aspect ratio and a truncated oval head, which is used to ensure the adjustment of the projectile posture under the conditions of large impact angle and large attack angle. The penetration rod body preferably has a tensile strength of not less than 1000MPa and an impact energy of not less than 30J / cm 2 , high entropy alloys with a fracture elongation of not less than 8%, such as CrMnFeCoNi, Al0.3CoCrFeNi, etc.;

[0042] The posture adjustment cap 2 is installed on the head of the penetration rod body 4, and the outer generatrix is ​​a pointed oval, and the inner generatrix is ​​the same shape as the head of the penetration rod body 4, which is a truncated oval, and is used to correct the posture of the projectile during the tilting action target;

[0043] The hood 1 is a pointed oval thin-walled structure, which is installed on the head of the penetration rod 4 and wrapped with the attitude adjustment cap 2, so as to achieve a good aerodynamic shape of the explosion structure during flight without affecting the penetration process of the explosion structure; the geometric shape of the hood 1 is controlled by parameters such as thickness, curvature radius, and length, and the thickness is 0.01 to 0.03 times the diameter of the explosion structure;

[0044] The wind cap 1, the posture adjustment cap 2 and the oval head of the penetration rod 4 form the head of the explosion structure;

[0045] The active core is placed inside the penetration rod 3 to form an explosion damage section of the explosive structure; the position and number of the active cores are determined according to the target characteristics and damage requirements of the target to be penetrated. The activation threshold of each active core decreases from the head to the tail of the penetration rod 3.

[0046] The confining pressure peak-cutting structure 4 is wrapped around the outside of the active core. On the one hand, it forms a confining pressure constraint on the active core material. On the other hand, it reduces the peak short-time load generated by the penetration rod 3 penetrating the target into a low-peak long-time load, thereby preventing the active core inside from activating prematurely and exploding.

[0047] The outer diameter of the confining pressure peak-cutting structure is 0.7 to 0.9 times the outer diameter of the penetration rod, achieving efficient explosive disintegration of the explosion-damaged section in the target specific compartment / position.

[0048] The confining pressure peak cutting structure is preferably made of high compression rate and high energy absorption metal material (compression rate is not less than 20%, energy absorption density is not less than 150MJ / m 3), such as foam metal (aluminum foam, titanium foam, etc.), dense porous metamaterials (porous ceramics, porous carbon materials, etc.); the thickness of the confining pressure peak-cutting structure should be determined based on the high-speed target characteristics of the penetrating rod and the load evolution characteristics inside the penetrating rod. The shock wave decays exponentially in the confining pressure peak-cutting structure. The thickness of the structure should ensure that the active material is activated and exploded in time, and the pressure transmitted to the active material should satisfy the following relationship:

[0049] P=(1+λ)P 0 exp(-αh)

[0050] Where h is the thickness of the confining pressure peak-cutting structure, α is the shock wave attenuation coefficient, which is related to the material of the confining pressure peak-cutting structure, and P 0 is the pressure at the shock wave clipping peak structure, and λ is the activation factor of the active material.

[0051] The penetration rod body 3 is excluding the explosion damage section with the active core, and the remaining penetration rod body is the penetration damage section of the explosion structure. According to the specific conditions of the target plate, the penetration damage section can be located in front of all the explosion damage sections, such as Figure 1 As shown, it can also be located between the explosion damage sections, such as Figure 2 shown.

[0052] The high threshold active core is cylindrical and uses high energy content and high insensitivity (theoretical energy content is not less than 7MJ / kg, activation threshold is greater than 2GPa) polymeric fluoropolymer-based active materials; key parameters such as the outer envelope size and theoretical energy content of the high threshold active core should be determined in combination with the target damage requirements. Preferably, the high threshold active core can use a PTFE / Al / W formula system.

[0053] The low threshold active core is cylindrical and uses a high energy sensitized (theoretical energy content is not less than 7MJ / kg, activation threshold is less than 900MPa) polymeric fluoropolymer-based active material; key parameters such as the outer envelope size and theoretical energy content of the low threshold active core should be determined in combination with the target damage requirements. Preferably, the low threshold active core can be made of PTFE / Al / TiH 2 Formula system.

[0054] Preferably, the activation threshold of the active material should be determined according to the projectile-target action conditions and should satisfy the following relationship:

[0055] P p =ρ 0p [c 0 +s p (vu t )](vu t )exp(-δl)

[0056] Where v is the speed at which the explosive structure collides with the target plate, ut is the particle velocity in the target plate, c 0 is the sound velocity of the active material, s is a constant, ρ 0p is the initial density of the explosion structure, δ is the equivalent shock wave attenuation factor, and l is the equivalent shock wave attenuation length.

[0057] A weak groove can be set on the outer circumference of the penetration rod body 3 of the penetration and damage section, and the penetration rod body 3 can be prefabricated into multiple sections. The fragmentation and destruction of the front section of the penetration rod body have little effect on the rear section of the rod body, thereby regulating the destructive behavior of the penetration and damage section of the rod body during the process of penetrating the target.

[0058] Preferably, the weakened groove is sawtooth-shaped, the sawtooth is an equilateral triangle, the top angle is 60°, and the direction angle is 60°.

[0059] The length of the weak groove (penetration section) engraved on the penetration rod body is related to conditions such as the target plate material, target plate thickness, and impact speed.

[0060] Among them, the shock wave pressure generated by the penetration rod colliding with the single-layer ship target plate can be calculated by the one-dimensional shock wave theory:

[0061] L 1 =-(1 / α)ln(P c / P 0 )

[0062]

[0063] In the formula, α is a coefficient related to material properties, ρ f , P f , U f and ρ t , P t , U t It is the density, pressure and wave velocity in the fragments and target plate materials after the shock wave passes.

[0064] Taking into account the shock wave attenuation effect and the rarefaction wave unloading effect, the length of the penetrating rod that breaks into pieces after impacting a single-layer target plate can be written as:

[0065] L=min[L 1 ,L 2 ]

[0066] The axial residual velocity v of the explosive structure after penetrating the single-layer target plate r It can be given by Demre formula:

[0067] v r =v 0 -Gd 0.75 h 0.7 / M 0.5

[0068] Furthermore, the length of the penetration rod body with the weak groove passing through the multi-layer target plate and breaking (the length of the penetration section passing through the multi-layer target plate and breaking) can be approximately calculated by repeating the above steps.

[0069] The following is an explanation with reference to a specific example.

[0070] Penetrate six target plates, and produce fixed layer damage between the 1st-2nd and 5th-6th target plates. Figure 1 The blasting structure shown, from the head to the back, consists of a high-threshold blast damage section I (with a built-in high-threshold active core), a penetration damage section (with pre-fabricated serrated weak grooves on the outer circumference), and a low-threshold blast damage section II (with a built-in low-threshold active core).

[0071] like Figure 3 As shown, the hood is a pointed oval thin-walled structure with a bottom diameter of 170mm, a hood length of 260mm, a side wall curvature radius of 680mm, and a wall thickness of 3mm. The hood material is LY12 aluminum alloy, with an elastic modulus of 72GPa, a tensile strength of 460MPa, a yield strength of 380MPa, and a density of 2.78g / cm 3 .

[0072] like Figure 4 As shown, the diameter of the bottom end of the posture adjustment cap is 170mm, the length is 160mm, the outer generatrix curvature radius is 234mm, the inner generatrix curvature radius is 192mm, and the top truncated diameter of the inner cavity is 20mm. The posture adjustment cap is made of brass with a density of 8.9g / cm 3 , tensile strength 210MPa, yield strength 33MPa, hardness 37HBS.

[0073] like Figure 5 As shown in the figure, the outer envelope size of the confining pressure peak cutting structure is Φ135mm×145mm, the inner cavity size is Φ115mm×125mm, the wall thickness is 10mm, and the material is small-pore natural cast foam aluminum with a density of 0.4g / cm 3 , dynamic platform stress is 1.37MPa, and mass specific energy absorption is 2.89kJ / kg.

[0074] like Figure 6 As shown, the high threshold active core is cylindrical, with an outer envelope size of Φ115mm×125mm, and a material formula of PTFE 66.2wt.% / Al 23.8wt.% / W 10.0wt.%, which is prepared by dry mixing, hot pressing, and vacuum sintering, with a density of 2.71g / cm 3 The theoretical energy content is 7.74MJ / kg, the activation pressure threshold is 2.46GPa, and it is tightly assembled in the inner cavity of the confining pressure peak-cutting structure.

[0075] like Figure 7As shown, the low threshold active core is cylindrical, the outer envelope size is Φ115mm×125mm, and the material formula is PTFE 66.2wt.% / Al 23.8wt.% / TiH 2 10.0wt.%, prepared by dry mixing, hot pressing and vacuum sintering, with a density of 2.41g / cm 3 The theoretical energy content is 8.82MJ / kg, the activation pressure threshold is 762MPa, and it is tightly assembled in the inner cavity of the confining pressure peak cutting structure.

[0076] like Figure 8 As shown, the length of the penetration rod is 785mm and the outer diameter is 170mm. The outer envelope geometry of the truncated oval head is consistent with the inner generatrix geometry of the posture adjustment cap. The length of the truncated oval head is 100mm, the radius of curvature of the truncated oval head is 192mm, and the truncated diameter of the head is 20mm. The geometric centers of the two short cylindrical cavities in the penetration rod are 238mm and 655mm away from the head of the rod body, respectively. Seven sawtooth prefabricated grooves are engraved in the middle of the rod body. The vertex of the bottom end of the first groove is 352mm away from the head of the rod body. The distance between the bottom vertices of each two grooves is 30mm. The sawtooth groove is an equilateral triangle with a top angle of 60°, a direction angle of 90°, and a depth of 9.8mm. The material of the penetration rod body is a CoCrFeMnNi high entropy alloy prepared by additive manufacturing technology. The quasi-static yield strength is 565MPa, the dynamic yield strength is greater than 1000MPa, and the elongation at break is 10%.

[0077] When the explosive structure acts on 6 simulated ship target plates (the material of the 6 target plates is 921A, the thickness is 20mm, and the distance between each target plate is 2m) at a speed of 800m / s, the working principle is as follows: Fig. 9 As shown, the details are as follows:

[0078] When the explosive structure flies at high speed, the pointed oval wind cap 1 forms a good aerodynamic shape for the projectile, which can significantly reduce the flight resistance of the projectile, so that the projectile can still maintain a high impact speed at the end of the trajectory. When the explosive structure contacts the six-layer target plate at a certain impact angle and high speed, the wind cap 1 first collides with the first layer of the target plate. Since the wind cap 1 is a thin-walled structure made of LY12 aluminum alloy, it basically has no penetration ability and will quickly break and fly under the collision load.

[0079] Subsequently, the attitude adjustment cap 2 collides with the first target plate. Since the attitude adjustment cap 2 is made of a softer brass material, it will be squeezed and deformed during the collision with the first target plate. Under the action of the rotational torque of the blasting structure, the impact angle is reduced, and the impact posture of the blasting structure is adjusted so that the structure can interact with the target plate at a smaller impact angle.

[0080] As the posture adjustment cap 2 is deformed and destroyed, the penetration rod body 3 subsequently collides with the first target plate. Since the head of the penetration rod body 3 is a truncated oval, it further generates a rotational torque after colliding with the target plate, which further reduces the target impact angle of the explosive structure, and is more conducive to the subsequent interaction of the explosive structure with the multi-layer target plate in a better posture. During the collision of the penetration rod body 3 with the first target plate, a strong impact load and shock wave are generated. On the one hand, it causes the head of the high-entropy alloy penetration rod body 3 to be fragmented and destroyed, and on the other hand, it propagates along the axial direction of the penetration rod body. Due to the presence of the foam aluminum material confining pressure clipping structure 4, the load peak transmitted to the active core 5 during the collision of the rod body with the first target plate is weakened, avoiding the premature activation of the active core 5 and the explosive energy release.

[0081] After penetrating the first layer of target plates, the high-threshold explosion damage section I filled with the confining pressure peak-cutting structure 4 and the high-threshold active core 5 enters between the 1-2 target plates, the high-entropy alloy shell outside the short cylindrical cavity is shattered, the stress of the confining pressure peak-cutting structure 4 is released and shattered, and the shock wave is transmitted to the active core 5, reaching the activation threshold of the high-threshold active core 5, causing it to activate and explode, producing an explosion damage effect between the 1-2 target plates.

[0082] After that, the remaining structure continues to act on the subsequent target plates by relying on the penetration damage segment of the penetration rod body 3. Since the penetration damage segment is a prefabricated weak link with circumferential grooves and is made of a relatively brittle high-entropy alloy, the penetration rod body breaks into pieces every time it penetrates a layer of target plate, and penetrates the 3rd, 4th, and 5th target plates in sequence.

[0083] After the remaining structure enters the space between the 5th and 6th target plates, the high-entropy alloy shell outside the short cylindrical cavity of the remaining explosion damage section shatters, the stress of the confining pressure peak-cutting structure 4 is released and shattered, and the shock wave is transmitted to the low-threshold active core 6, reaching the activation threshold of the low-threshold active core 6, causing it to activate and explode, producing an explosion damage effect between the 1st and 2nd target plates.

[0084] Based on the above principle, the explosion damage section position, penetration rod length, groove depth, number, position, active core activation threshold and energy content can be adjusted in combination with target characteristics such as the number of target plate layers, target plate thickness, and damage position requirements. Figure 2 As shown, when penetrating six target plates, fixed layer damage will occur between the 4th-5th and 5th-6th target plates. The working principle is as follows Fig.10 Through the above-mentioned process, it is possible to achieve the explosion damage effect at a specific target compartment, position and depth without the presence of a fuse or charge.

[0085] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An explosive structure without a fuze charge for achieving fixed layer / deep explosion, characterized in that: include: Wind cap 1, posture adjustment cap 2, penetration rod body 3, confining pressure peak cutting structure 4 and active core; The wind cap 1 and the posture adjustment cap 2 are installed on the head of the penetration rod body 4 to adjust the posture of the penetration structure when it hits the target. The active core is built into the penetration rod 3 to form an explosive damage section of the explosive structure; the portion of the penetration rod 3 without the active core built in forms the penetration damage section of the explosive structure; based on the fixed layer / deep damage target of the target plate, the position and number of the explosive damage section and the penetration damage section are adjusted; when there are multiple explosive damage sections, the activation threshold of the built-in active core decreases in sequence from the head to the tail of the penetration rod 3; The confining pressure peak-cutting structure 4 is wrapped around the outside of the active core, and is used to form a confining pressure constraint on the active core and reduce the high peak short-time load generated by the penetration rod 3 during the penetration of the target into a low peak long-time load.

2. The structure according to claim 1, characterized in that A weak groove is prefabricated on the outer circumference of the penetration rod body 3.

3. The structure according to claim 2, characterized in that The weak groove is a V-shaped groove, a sawtooth groove or a rectangular groove.

4. The structure according to claim 2, characterized in that The length of the weak groove engraved on the penetrating rod body is L = min[L1,L2], where L1-(1 / α)ln(P c / P0) Among them, α is the coefficient related to the material properties of the penetrating rod 3, ρ f , P f , U f and ρ t , P t , U t It is the density, pressure and wave speed of the shock wave penetrating the rod body and target plate material after transmission.

5. The structure according to any one of claims 1 to 4, characterized in that: The penetration rod 3 has a tensile strength of not less than 1000MPa and an impact energy of not less than 30J / cm 2 , made of high entropy alloy with an elongation at break of not less than 8%.

6. The structure according to claim 1, characterized in that The confining pressure peak cutting structure 4 adopts a compression rate of not less than 20% and an energy absorption density of not less than 150MJ / m 3 Made of metal material.

7. The structure according to claim 1 or 6, characterized in that: The outer diameter of the confining pressure peak-cutting structure 4 is 0.7 to 0.9 times the outer diameter of the penetration rod body 3; the thickness h of the confining pressure peak-cutting structure 4 satisfies: P=(1+λ)P0exp(-αh) Wherein, P is the pressure transmitted into the active material; λ is the activation factor of the active core in the confining pressure peak-cutting structure 4; P0 is the pressure of the shock wave at the pressure peak-cutting structure 4; α is the shock wave attenuation coefficient, which is related to the material of the confining pressure peak-cutting structure.

8. The structure according to claim 1, characterized in that When there are multiple explosion damage sections, the high-threshold active core adopts a high-energy, highly insensitive polymer-based fluoropolymer-based active material with a theoretical energy content of not less than 7MJ / kg and an activation threshold greater than 2Gpa; the low-threshold active core adopts a high-energy, sensitized polymer-based fluoropolymer-based active material with a theoretical energy content of not less than 7MJ / kg and an activation threshold less than 900MPa.

9. The structure according to claim 1 or 8, characterized in that: The activation threshold of the active material is determined according to the projectile-target action conditions and satisfies the following relationship: P p =ρ 0p [c0+s p (vu t )](vu t )exp(-δl) Among them, P p is the internal pressure of the active material, ρ 0p is the initial density of the explosion structure, c0 is the sound velocity of the active material, s p is the empirical coefficient, v is the speed at which the explosive structure collides with the target plate, and u t is the particle velocity in the target plate, δ is the equivalent shock wave attenuation factor, and l is the equivalent shock wave attenuation length.

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