A scaled condition penetration-explosion combined loading method

Abstract

The application discloses a penetration-explosion combined loading method under a scaled condition. The penetration-explosion combined loading method is combined by a two-stage light gas gun and acid silver acetylide photosensitive explosive, penetration-explosion combined loading is realized by the penetration of a projectile into a metal foil to generate a fragment cloud to splash and initiate the explosive, and the problem that penetration and explosion cannot be simultaneously or combined loaded in the scaled weapon experiment is solved.

Description

Technical Field

[0001] This invention relates to a method for combined penetration-explosion loading under scaled conditions, belonging to the field of impact dynamics experimental technology. Background Technology

[0002] In real weapons firing tests, the anti-tank warhead detonates inside the target. The resulting shockwave acts on the wall or floor in front of it, while the warhead continues to penetrate the floor slab at extremely high speed. This causes the floor slab to suffer combined damage from the shockwave and penetration effects, such as... Figure 1 As shown. However, when simulating in the laboratory, scaled-down weapon experiments are required. Currently, the technical difficulty in simulating the combined destructive effect of shock wave and penetration using a launching device lies in the difficulty of miniaturizing the warhead and fuse, thus making it impossible to effectively control the detonation of the charge and complete the simulation under scaled-down conditions. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a method for simultaneously or jointly loading the penetration and explosion effects in scaled-down weapon experiments.

[0004] To achieve the above objectives, the technical solution proposed in this invention is: a method for combined penetration-explosion loading under scaled-down conditions.

[0005] A photosensitive explosive coating is applied to the surface of the target structure, and a metal foil is applied to the front side of the target structure.

[0006] A light gas cannon is used to launch an uncharged projectile to a predetermined penetration velocity. The projectile strikes a metal foil, creating a cloud of metal fragments, and the projectile continues to travel forward.

[0007] A cloud of metal fragments impacts the coating of a photosensitive explosive, triggering the explosive to detonate and generate a shock wave. The projectile then reaches the surface of the target structure, achieving penetration and loading.

[0008] A further design of the above technical solution is as follows: the areal density distribution curve of the photosensitive explosive coating on the surface of the target structure is:

[0009] I=0.00565 ρ a 2 +7.03 ρ a

[0010] Where I is the areal density and pa is the specific impulse.

[0011] The shock wave generated by the detonation of the photosensitive explosive arrives at the target structure surface simultaneously with the projectile.

[0012] Projectiles are launched using a two-stage light gas gun.

[0013] The photosensitive explosive is silver acetylene-silver nitrate.

[0014] The present invention has the following advantages:

[0015] This invention uses uncharged projectiles to simulate a warhead, uses photosensitive explosives to simulate a shock wave, and uses the cloud of metal fragments generated by the projectile impacting a metal foil as a fuse to detonate the photosensitive explosive, thereby achieving simultaneous or combined loading of penetration and explosion effects under scaled conditions.

[0016] This invention proposes a surface density distribution curve for the photosensitive explosive coating on the target structure surface, making the simulated explosion shock wave closer to the real situation. Attached Figure Description

[0017] Figure 1 A schematic diagram of the combined penetration-explosion loading scenario;

[0018] Figure 2 A schematic diagram of the main methods involved in the invention;

[0019] Figure 3 Simulation and experimental photographs of the debris cloud generated by a projectile impacting a metal foil;

[0020] Figure 4 A schematic diagram illustrating the sputtering of a fragment cloud onto the surface of a photosensitive explosive coating and the subsequent detonation of the explosive.

[0021] Figure 5 Schematic diagram of a scenario involving combined penetration and shock wave loading;

[0022] Figure 6 This is a curve showing the fitted relationship between the surface density and specific impulse of a photosensitive explosive. Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Example 1

[0024] The scaled-down penetration-explosive combined loading method of this embodiment, such as Figure 2 As shown, firstly, photosensitive explosives are applied to the surface of the target structure by spraying to form a photosensitive explosive coating; and then a metal foil or metal plate is placed on the front side of the target structure.

[0025] Then, using a secondary light gas cannon, an uncharged projectile is launched to a predetermined penetration velocity. The projectile impacts the metal foil or thin metal plate at high speed, generating a large cloud of metal fragments, such as... Figure 3 As shown, the debris cloud generated by the projectile impacting the metal foil will reach the target structure before the projectile, and because the metal foil structure is very weak, it will not slow down the projectile.

[0026] A cloud of high-speed metal fragments sputters onto the surface of a photosensitive explosive coating, detonating the explosive. Figure 4 As shown.

[0027] Photosensitive explosives detonate, simulating shock wave loading, and the projectile synchronously reaches the target structure surface, achieving penetration loading. Figure 5 . Example 2

[0028] The joint loading method in this embodiment includes the following steps:

[0029] 1. Design of photosensitive explosive coating;

[0030] Based on the simulation results of shock waves under real penetration-explosion scenarios, the specific impulse distribution of the target structure under the action of the shock wave was calculated, and the areal density distribution of the photosensitive explosive coating on the target structure was solved. The specific impulse of the photosensitive explosive and the areal density have an approximately linear relationship, and its fitting curve can be obtained from I=0.00565. ρ a 2 +7.03 ρ a Indicates, such as Figure 6 As shown, by precisely controlling the shape of the coating, the load generated by the explosion of the photosensitive explosive can be controlled to be similar to the load generated by the explosion of the actual warhead charge. In this embodiment, the photosensitive explosive is silver acetylene-silver nitrate.

[0031] 2. Spraying photosensitive explosives;

[0032] Based on the areal density distribution of the photosensitive explosive calculated in the previous step, a photosensitive explosive coating with the corresponding areal density is sprayed onto the target structure and dried for later use.

[0033] 3. Calculate the thickness of the metal foil and its distance from the explosive coating;

[0034] The fragment cloud generated by the projectile impacting the metal foil is crucial for initiating photosensitive explosives, effectively controlling their detonation time. To ensure the timing sequence of shock wave loading and penetration loading, the dispersion velocity of the fragment cloud needs to be calculated. Then, the thickness of the metal foil or the distance between it and the explosive coating is adjusted to control the time interval between explosive detonation and projectile penetration.

[0035] 4. Launch preparation;

[0036] The metal foil and target structure are arranged at the designed intervals, and the support is provided. Then, the projectile is launched at the preset speed to achieve the simultaneous or combined loading of penetration and explosion effects.

[0037] The technical solutions of the present invention are not limited to the above embodiments. All technical solutions obtained by equivalent substitution fall within the scope of protection claimed by the present invention.

Claims

1. A method for combined penetration-explosive loading under scaled-down conditions, characterized in that: A photosensitive explosive coating is applied to the surface of the target structure, and a metal foil is applied to the front side of the target structure. A light gas cannon is used to launch an uncharged projectile to a predetermined penetration velocity. The projectile strikes a metal foil, creating a cloud of metal fragments, and the projectile continues to travel forward. A cloud of metal fragments impacts the coating of a photosensitive explosive, triggering the explosive to detonate and generate a shock wave. The projectile then reaches the surface of the target structure, achieving penetration and loading. The areal density distribution curve of the photosensitive explosive coating on the surface of the target structure is as follows: I=0.00565 ρ a 2 +7.03 ρ a Where I is specific impulse. ρ a is the areal density; The shock wave generated by the detonation of the photosensitive explosive arrives at the target structure surface simultaneously with the projectile.

2. The scaled-down penetration-explosive combined loading method according to claim 1, characterized in that: Projectiles are launched using a two-stage light gas gun.

3. The scaled-down penetration-explosive combined loading method according to claim 1, characterized in that: The photosensitive explosive is silver acetylene-silver nitrate.

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