Composite Armor with Embedded Ceramic Spheres
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Solution Overview
Problem
Conventional metal armor systems are becoming excessively heavy to effectively protect against increasingly powerful projectiles due to the need for heavier metal alloy plates, while fabricating lightweight metal matrix composite armor systems with embedded ceramic elements is challenging, especially in achieving optimal energy dissipation and bonding between components.
Innovation Solution
A dual casting methodology is employed, where a mold with elevations is used to create a first metallic casting with depressions, which is then reused to embed ceramic elements, and a second metallic material is poured to infiltrate and bond with both the first casting and elements, forming a composite armor system with a layered configuration that enhances strength and delamination resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metal alloy plates are used to protect against increasingly powerful projectiles, then protection effectiveness is improved, but weight becomes excessively heavy
Solution Approach 1:
The patent employs a composite armor system consisting of a metallic matrix (aluminum or aluminum alloy) embedded with hard spherical elements (ceramic spheres). This composite structure combines the lightweight properties of aluminum with the high hardness and energy absorption capabilities of ceramic spheres, achieving effective projectile resistance without the excessive weight of conventional solid metal alloy plates
Solution Approach 2:
The armor system distributes hard spherical elements throughout the metallic matrix in a regular array pattern. This local reinforcement strategy places hard elements only where needed to intercept and dissipate projectile energy, rather than using uniformly thick heavy metal plates throughout the entire armor structure
2Loss of energy
If hard spherical elements are embedded in a metallic matrix for optimal energy dissipation, then energy dissipation efficiency is improved, but fabrication becomes problematical
Solution Approach 1:
The patent employs a two-step casting process where spherical elements are first positioned in a mold, then the metallic matrix is cast around them. This preliminary positioning of spheres before matrix formation ensures optimal spacing and arrangement for energy dissipation while simplifying the overall fabrication process, as the spheres are embedded during casting rather than requiring subsequent complex assembly operations
Solution Approach 2:
The patent combines the positioning of spherical elements and the casting of the metallic matrix into a single integrated fabrication process. The mold design with elevations allows spheres to be automatically positioned at correct spacing during the casting operation itself, merging what would otherwise be separate positioning and casting steps into one unified manufacturing operation
3Loss of energy
If spherical elements are arranged in a regular array with good bond to matrix, then energy dissipation is optimized, but achieving non-contact between spheres becomes problematical
Solution Approach 1:
The mold includes elevations that protrude into the mold cavity at predetermined locations corresponding to where spherical elements should be positioned. These elevations serve as preliminary positioning features that automatically space the spheres at correct intervals during casting, ensuring they do not contact each other while maintaining optimal spacing for energy dissipation
Solution Approach 2:
The metallic matrix acts as an intermediary material that bonds the spherical elements together while maintaining the required spacing. The matrix fills the spaces between spheres, providing both structural support and ensuring that spheres remain separated by appropriate distances for optimal energy dissipation performance
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 method results in a durable, lightweight composite armor system that effectively resists projectile impact, offering improved energy dissipation and bonding between components, thereby addressing the weight and efficiency issues of conventional armor systems.
Implementation Method 1
The second metallic material is permitted to infiltrate, with heating persisting for a suitable period of time to promote coverage and bonding among all of the adjacent surfaces of second metallic material, the first casting, and the embedment elements
Implementation Method 2
The base portion is heated for a period of time during and after the pouring of the liquid first metallic material into the mold
Data Source
AI summary
According to typical inventive practice, a first metallic material is poured into a mold including a bottom inside surface having regularly arrayed rises (truncated spherical convexities). The molten first metallic material cools and solidifies to include a surface correspondingly having regularly arrayed dents (truncated spherical concavities). The resultant “inner casting” is removed from and repositioned in the mold so that the inner casting's dent-laden surface faces upward. Ceramic spheres are placed in the dents. A second metallic material (having a higher melting point than the first metallic material) is poured into the mold with the inner casting and spheres in place. The molten second metallic material cools and solidifies as an “outer casting” surrounding the inner casting and the spheres. The resultant integral armor structure includes the inner casting, the outer casting, and the spheres, each sphere embedded partially in the inner casting and partially in the outer casting.