Shaped Charge Liner Composite Design for Penetration
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Solution Overview
Problem
Shaped charge liners face challenges such as brittleness, the need for binders or matrices, reduced penetration capacity, and high oxygen content, which affect the performance and efficiency of the penetrating jet in hard target penetration.
Innovation Solution
A shaped charge liner comprising a low-density carrier with a high-density metal or metal oxide coating, where the coating has minimal oxygen content and is deposited using techniques like chemical vapour deposition, providing a non-porous and thin penetrating jet with optimized properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional metal liner is used in shaped charge, then the liner provides structural integrity, but it becomes brittle and reduces penetration capacity
Solution Approach 1:
The liner is constructed as a composite structure with a copper carrier (providing ductility and structural integrity) and a tungsten coating (providing high density and penetration capability). This composite approach allows the liner to maintain structural strength while avoiding brittleness, as the copper base material provides toughness and the tungsten coating provides the necessary density for penetration without compromising the underlying structural integrity.
2Stability of the object's composition
If a binder or matrix is added to the liner, then the liner provides structural cohesion, but it reduces the ultimate penetration capacity
Solution Approach 1:
The invention extracts and eliminates the binder or matrix component from the liner composition entirely. Instead of using binders to provide structural cohesion, the patent relies on a direct metal-to-metal interface between the copper carrier and tungsten coating, bonded through deposition processes. This removal of unnecessary binder material ensures that 100% of the liner mass contributes to the penetrating jet, maximizing penetration capacity while structural cohesion is maintained through the deposition bonding interface.
3Quantity of substance
If the liner has high density, then the penetrating jet has high mass, but it increases the overall weight of the projectile
Solution Approach 1:
The liner applies local quality by concentrating the high-density tungsten material specifically where it is needed - in the coating layer that forms the penetrating jet. The copper carrier provides the necessary structural volume at lower density, while the tungsten coating provides high density only in the thin outer layer that becomes the penetrating jet. This localized application of high-density material maximizes jet mass and penetration capability while minimizing the overall projectile weight compared to a uniformly dense construction.
4Strength
If the coating thickness is increased, then the penetration capability improves, but the overall liner size and weight increase
Solution Approach 1:
The composite structure allows for an optimized thickness ratio where the copper carrier provides structural volume and the thin tungsten coating provides penetration capability. The copper carrier's lower density and higher ductility allow it to be thicker while the tungsten coating can be thinner yet still provide sufficient penetration, as tungsten's high density provides more mass in less thickness. This composite approach achieves penetration capability with minimal overall liner size.
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 solution results in a cost-efficient, lightweight projectile with improved penetration capabilities and reduced brittleness, achieving enhanced jet performance and penetration efficiency with minimal oxygen content in the coating.
Implementation Method 1
deposited using techniques like chemical vapour deposition
Implementation Method 2
The detonation front travels in an expanding spherical shock wave. As the shock wave passes through the metal liner, the liner collapses.
Data Source
AI summary
The present invention relates to a liner for shaped charge for penetrating hard targets, wherein the liner comprises i) a carrier having a density below 9500 kg/m3; and ii) a coating deposited on said carrier comprising at least one metal and/or metal oxide, wherein the coating has a density greater than 10000 kg/m3; wherein the thickness ratio of the carrier to the coating ranges from 100:1 to 1:1, and wherein the oxygen content in the coating is less than 100 ppm atomic. The invention also relates to a method of producing such shaped charge liner and the use 0 thereof in a projectile for penetrating a hard military target.