Castable Frangible Projectile Using Eutectic Alloy
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Solution Overview
Problem
Conventional frangible projectiles are brittle and prone to breaking apart before reaching the target, especially when fired at higher velocities or through rifled barrels, failing to effectively pulverize into fine particulates upon impact.
Innovation Solution
A castable frangible projectile system utilizing a eutectic mixture of bismuth, tin, and lead, with a melting point below the individual components' melting points, is developed, allowing the projectile to be melted, cast, and configured to break into fragments upon impact, while also being ductile enough to survive rifling and maintain fragmentation capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressed or sintered powders are used to create frangible projectiles, then the projectiles can break into particles upon impact, but they break apart before reaching the target when fired at higher velocities
Solution Approach 1:
The patent changes the material parameters by using a eutectic alloy composition (specifically bismuth, lead, and tin in controlled proportions) that exhibits different mechanical properties than conventional pressed powders. The alloy's specific composition creates a material that is ductile enough to survive rifling and high-velocity flight yet frangible enough to break into fine particulates upon target impact
Solution Approach 2:
The patent employs a composite approach by creating a multi-component eutectic alloy system rather than using single metals or simple pressed powder compositions. The combination of bismuth, lead, and tin in specific ratios creates a composite material with tailored properties that balance ductility and frangibility, resolving the contradiction between surviving flight and breaking on impact
2Reliability
If conventional frangible projectiles are made with brittle composition, then they can pulverize into fine particulates upon impact, but they break apart before reaching the target when fired through rifled barrels
Solution Approach 1:
The patent modifies the material parameters by developing a specific eutectic alloy composition that changes the fundamental mechanical behavior of the projectile material. The alloy exhibits a transition from brittle behavior (conventional materials) to controlled ductility that allows it to withstand the mechanical stresses of rifling engagement while maintaining the ability to fragment on target impact
3Strength
If the projectile is made ductile to survive rifling, then it can be fired through rifled barrels, but it may not break into fine particulates upon impact
Solution Approach 1:
The patent achieves the resolution by precisely controlling the compositional parameters of the eutectic alloy. The specific ratios of bismuth, lead, and tin create a material with optimized mechanical properties where the ductility is sufficient to survive rifling but the internal structure and bonding characteristics ensure controlled fragmentation into fine particulates upon target impact, thus achieving both requirements simultaneously
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 castable frangible projectile effectively breaks into fragments upon impact, ensuring target penetration and pulverization without pre-impact breakage, and can be scaled for various calibers and platforms, including rifled and smoothbore weapons.
Implementation Method 1
A castable frangible projectile system utilizing a eutectic mixture of bismuth, tin, and lead, with a melting point below the individual components' melting points
Data Source
AI summary
A novel castable frangible projectile and techniques for manufacturing such are provided. A cartridge system includes a case defining a volume, a propellant disposed in the volume of the case, and a projectile coupled to the case. The projectile includes a body disposed at least partially within the case and configured to enclose the propellant within the volume of the case. The body is formed of a castable eutectic mixture, the castable eutectic mixture configured to be melted and cast, wherein the body is configured to break into a plurality of fragments upon impact with a target.