Forward-Firing Fragmentation Warhead with Pulverizable Case
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Solution Overview
Problem
Fragmentation warheads currently face challenges in achieving high lethality while minimizing collateral damage, as the radial distribution of fragments can cause harm to friendly troops and launch platforms, with existing designs resulting in inefficient mass distribution and increased collateral damage due to the expansion of steel case fragments.
Innovation Solution
A forward-firing fragmentation warhead design that incorporates a pulverizable case and a pattern shaper to control the pressure wave and fragment distribution, ensuring fragments are expelled in a uniform pattern over a prescribed solid angle, reducing collateral damage and improving lethality by confining fragments within a narrower angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a radial blast fragmentation warhead is used, then the fragments are expelled in all directions providing wide coverage, but this causes collateral damage to friendly troops and the launch platform
Solution Approach 1:
The warhead transitions from radial (symmetric 360-degree) fragment distribution to forward-firing (asymmetric directional) fragment distribution. The fragmentation assembly is positioned at the forward end and fragments are expelled primarily in the forward direction along the body axis, creating an asymmetric lethal pattern that concentrates effect on the target while minimizing backward and lateral fragmentation that would harm friendly forces.
Solution Approach 2:
Instead of expelling fragments radially outward from the center of the explosive (conventional approach), the design inverts the approach by positioning the fragmentation assembly at the forward end against the explosive surface, causing fragments to be propelled forward in a directional pattern rather than outward in all directions.
2Manufacturing precision
If a forward blast fragmentation warhead with scored metal is used, then the fragments are expelled in a predictable forward pattern, but the mass efficiency is only about 80% due to interstitial mass consumption
Solution Approach 1:
The design changes the physical state and configuration parameters of the fragmentation material. Instead of using scored metal sheets that consume interstitial mass, the invention uses pre-formed discrete fragments (spheres, cubes, or other shapes) that are held in a matrix or container. This parameter change eliminates the interstitial mass problem while maintaining predictable forward-firing fragment distribution.
3Force
If the steel case confines the radial energy to redirect it forward, then the lethality radius is increased, but the tails of fragments extend beyond the desired cone causing collateral damage
Solution Approach 1:
The design extracts the fragmentation function from the steel case structure. Instead of relying on the steel case to confine and redirect energy (which creates uncontrolled fragment tails), the invention places a dedicated fragmentation assembly at the forward end containing pre-formed fragments in a controlled matrix or container. This separation allows the case to be optimized for energy confinement while the fragmentation assembly provides controlled fragment distribution without excessive tails.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves a high-lethality, low-collateral-damage profile with a mass efficiency of at least 70% for metal fragments, significantly reducing the risk of harm to non-target areas and maintaining the effectiveness of the warhead within a defined lethal radius.
Implementation Method 1
Detonation of the explosive produces a gas blast that emanates radially from the center point pulverizing the case and expelling the pre-cut metal fragments in all directions
Implementation Method 2
The steel case confines a portion of the radial energy of the pressure wave (albeit for a very short duration) caused by detonation of the explosive and redirects it along the body axis of the warhead
Data Source
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AI summary
In a high-lethality low collateral damage forward firing fragmentation warhead, the case 18, 231 (and any containment structures) are formed of a materials that are pulverized upon detonation of the explosive 30, 238. As a result, the lethality radius of the pulverized case fragments is no greater than that of the gas blast, thus reducing potential collateral damage. Warhead lethality may be improved by configuring the fragmentation assembly to expel fragments with a more uniform distribution over the forward-firing pattern 22. This may be accomplished by placing a pattern shaper 48 between the fragmentation layer 40 and the explosive 30 to shape the pressure wavefront. Alternately, this may be accomplished by forming the fragmentation layer and explosive with complementary dome-shapes 252, 240 that approximately matches the shape of the front of the pressure wave 270. The two approaches may be combined by placing a variable-thickness pattern shaper 310 between the dome-shaped fragmentation layer 252 and the explosive 238 to provide additional shaping of the forward-firing pattern. Warhead weight and cost can be reduced by eliminating explosive at the aft end of the warhead that does not contribute to the total energy imparted to the fragments. More specifically, the aft section of the explosive and explosive containment structure may be tapered to approximately match the expansion of the pressure wave from the single-point aft detonation.