Rounded projectiles for target disruption
View Patent ↗Provided are methods and related devices for disrupting an explosive device using a propellant driven disrupter (PDD) that propels a rounded projectile (RP) toward an explosive device. The RP travels along a linear trajectory and impacts the target, including a barrier portion of the explosive device. The impacting between the RP and barrier forms a composite projectile via a solid state weld between a portion of the barrier and the RP distal end, thereby minimizing or avoiding spall and fragment generation into the explosive device. The projectile traverses a penetration distance along the linear trajectory, or a defined-angle relative thereto, to disrupt the explosive device without unwanted explosive detonation.
1. A system for use in a propellant driven disrupter (PDD) for disrupting an explosive device, the system comprising:
a first cylindrical shell corresponding to a blank cartridge having a first shell proximal end and a first shell distal end, the first shell proximal end configured to face a barrel breech end of a barrel of the PDD, and the first shell distal end configured to face a barrel muzzle end of the PDD; wherein the first cylindrical shell is at least partially formed of a metallic material;
a rounded projectile (RP) having: a RP proximal end facing toward the disrupter barrel breech end when loaded in the barrel; a RP distal end opposed to the proximal end and facing toward the disrupter barrel muzzle end when loaded in the barrel; and a RP maximal outer diameter being between 90% and 100% of an inner diameter of the disrupter barrel;
a wadding in physical contact with and covering the RP proximal end;
a propellant region comprising a propellant; wherein the propellant region is inside the first cylindrical shell,
a tamp at the cartridge distal end positioned between the propellant region and the wadding.
2. The system of claim 1 , wherein the wadding is formed of a textile or other flexible material.
3. The system of claim 1 , wherein the wadding covers at least 50% of a surface area of the RP.
4. The system of claim 1 , wherein the wadding physically separates the blank cartridge and the RP.
5. The system of claim 2 , wherein the wadding is in physical contact with a proximal surface area region of the RP and the wadding is not in physical contact with the RP distal end.
6. The system of claim 1 , wherein the RP is at least partially positioned within a forcing cone lumen and/or within a bore lumen of the PDD barrel when the cartridge is loaded in the PDD barrel.
7. The system of claim 1 , wherein the cartridge propellant region comprises a plurality of types of propellant grains arranged as a mixture and/or as a plurality of layers; wherein the cartridge propellant region comprises more of a first type of propellant grains toward the cartridge proximal end and more of a second type of propellant grains toward the cartridge distal end; and wherein the first type of propellant grains are characterized by a higher characteristic burn rate than the second type of propellant grains.
8. The system of claim 1 , wherein the tamp comprises silicone, sand, clay, hollow ceramic microspheres, and/or a high density closed cell foam.
9. The system of claim 1 , wherein the RP has a spherical geometry and the PDD barrel's bore is not rifled.
10. The system of claim 1 , wherein the RP has a half-capsule geometry and PDD barrel's bore is rifled.
11. The system of claim 1 , wherein the RP has a half-capsule geometry; and wherein the RP comprises an internal low-density region; wherein the internal low-density region is an empty cavity or a cavity filled with a filler material, the filler material having a lower density than that of the rest of the RP.
12. The system of claim 1 , wherein the RP has a maximal outer diameter that is between 96% and 99.9% of an internal diameter of the PDD barrel's bore.
13. The system of claim 1 , wherein the RP is formed of one or more steel alloys, a chromium steel, S2 steel, S4 steel, C300 steel, C350 steel, armor steel, one or more titanium alloys, Ti-6Al-4V, one or more nickel alloys, one or more tungsten alloys, synthetic rubber polymers, polyurethane, ceramics, carbon fiber reinforced polymer, or any combination of these.
14. The system of claim 1 , wherein the RP is formed of a material or materials configured to be non-frangible during use, such that the RP is not fractured or disintegrated upon impact with a metal barrier of the explosive device.
15. A method for disrupting an explosive device using a propellant driven disrupter (PDD), the method comprising the steps of:
loading the system of claim 1 into a disrupter barrel of the PDD; aiming the PDD at a target portion of the explosive device;
propelling the RP out of the barrel and toward the target portion of the explosive device; wherein the RP travels along a linear trajectory defined by a barrel longitudinal axis extending between a barrel muzzle end and the target portion;
impacting the RP with the explosive device or a portion thereof; traversing the RP a penetration distance through the explosive device or the portion thereof; wherein the RP traverses the penetration distance along said linear trajectory, such that the RP follows said linear trajectory during the steps of propelling, impacting, and traversing; and
disrupting the explosive device without detonating an explosive of the explosive device.
16. The method of claim 15 , wherein the disrupter barrel has a chamber region at the barrel breech end, a bore region between the chamber region and the barrel muzzle end, and optionally a forcing cone region between the chamber region and the bore region; wherein the chamber region is characterized by a chamber wall and a chamber inner diameter, the chamber wall and the chamber inner diameter defining a chamber lumen; wherein the bore region is characterized by a bore wall and a bore inner diameter, the bore wall and the bore inner diameter defining a bore lumen; wherein the forcing cone region, if present, is characterized by a forcing cone wall and at least one forcing cone inner diameter, the forcing cone wall and at least one forcing cone inner diameter defining a forcing cone lumen; and wherein: during the step of loading, the RP is loaded into the disrupter barrel such that the RP is at least partially positioned in the forcing cone lumen and/or the bore lumen of the disrupter barrel.
17. The method of claim 15 , wherein the RP linear trajectory is at an oblique angle relative to an outer barrier surface of the explosive device, the method further comprising the steps: determining an angle of incidence of the RP relative to the outer barrier surface; and from the angle of incidence determining a deflection angle of the RP that exits the outer barrier surface; and adjusting the aim to accommodate the deflection angle and ensure a desired point of impact is maintained.
18. A system for use in a propellant driven disrupter (PDD) for disrupting an explosive device, the system comprising:
a first cylindrical shell corresponding to a blank cartridge having a first shell proximal end and a first shell distal end, the first shell proximal end configured to face a barrel breech end of a barrel of the PDD, and the first shell distal end configured to face a barrel muzzle end of the PDD; wherein the first cylindrical shell is at least partially formed of a metallic material;
a rounded projectile (RP) having: a RP proximal end facing toward the disrupter barrel breech end when loaded in the barrel; a RP distal end opposed to the proximal end and facing toward the disrupter barrel muzzle end when loaded in the barrel; and a RP maximal outer diameter being between 90% and 100% of an inner diameter of the disrupter barrel;
a tamp positioned between the first shell distal end and the RP proximal end; and
a propellant region comprising a propellant; wherein the propellant region is inside the first cylindrical shell.
19. The system of claim 18 , wherein the tamp comprises a closed cell foam configured to facilitate a build-up of a gas pressure from the propellant and maximize burn rate of the propellant before the RP is propelled and increase a velocity of the subsequently propelled RP.