Ballistic Wall Structure Using Granular Fill and Composite Panels
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Solution Overview
Problem
Conventional building structures lack adequate protection against ballistic projectiles, and fortress-like constructions with hardened materials are expensive and time-consuming to build, leaving military personnel in unreinforced structures vulnerable during live fire situations.
Innovation Solution
A wall system comprising horizontal and vertical support members with panels of construction material and metallic sheets, filled with granular filler material like sand, and optionally including a flexible sheet and woven para-aramid fibers like Kevlar, to create a protective cavity that slows and deflects projectiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional building panels are used, then construction is simple and quick, but ballistic protection is insufficient
Solution Approach 1:
The wall system combines multiple materials with different properties: construction panels provide structural framework, metallic sheets provide ballistic resistance, and granular filler material provides energy absorption. This composite structure achieves superior ballistic protection compared to conventional single-material walls while maintaining reasonable construction complexity.
Solution Approach 2:
The wall structure employs a nested configuration where metallic sheets are mounted between construction panels, and granular filler material is contained within the cavity formed by these layers. This nested arrangement maximizes protection within a compact wall assembly, providing enhanced ballistic resistance without excessive wall thickness.
2Reliability
If fortress-like structures with hardened materials are built, then ballistic protection is improved, but construction cost and time increase significantly
Solution Approach 1:
The wall system is divided into modular components: vertical support members, horizontal members, panels, metallic sheets, and granular filler. These segments can be fabricated separately and assembled quickly on-site, reducing construction time compared to traditional monolithic fortress walls while maintaining protective effectiveness.
Solution Approach 2:
The invention changes the protective mechanism from relying on massive thickness (traditional fortress walls) to optimizing material properties and layering configuration. By adjusting parameters such as metallic sheet thickness, granular material type, and panel spacing, effective ballistic protection is achieved with reduced overall wall mass and faster construction.
3Reliability
If fortress-like structures with hardened materials are built, then ballistic protection is improved, but construction cost increases
Solution Approach 1:
The system uses composite construction where relatively thin metallic sheets (providing ballistic resistance) are combined with conventional construction panels and granular filler material. This approach achieves fortress-level protection with less total material volume compared to traditional hardened concrete or steel walls, reducing both material cost and transportation requirements.
Solution Approach 2:
Metallic sheets are strategically positioned at critical locations where ballistic resistance is most needed (between interior and exterior panels), while other portions of the wall use conventional materials. This localized application of high-strength materials optimizes protection effectiveness while minimizing overall material consumption and cost.
4Reliability
If conventional panels are used, then construction is quick and easy, but projectile penetration velocity remains high
Solution Approach 1:
Granular filler material serves as an intermediary layer between the exterior and interior panels, absorbing projectile kinetic energy through friction and deformation as the projectile passes through. This intermediary substance significantly reduces projectile velocity while the overall wall assembly can still be constructed using conventional framing and paneling techniques.
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 wall system provides quick and cost-effective ballistic protection by reducing projectile velocity and preventing penetration, while being easily transportable and constructible using conventional techniques, thus safeguarding building occupants without the need for extensive and expensive reinforced construction.
Implementation Method 1
A granular filler material substantially fills the cavity between the lower support member and the upper support member
Implementation Method 2
the granular filler material substantially fills the cavity
Implementation Method 3
a metallic sheet secured to the sheet of construction material
Implementation Method 4
a metallic sheet secured to the sheet of construction material
Implementation Method 5
a sheet of woven para-aramid fiber (e.g., Kevlar®) is loosely coupled to at least one of the first face and the second face
Data Source
AI summary
A wall structure and a method for constructing the wall of a building provide protection for inhabitants of the building against ballistic projectiles impacting the wall. The wall structure includes an outer panel and an inner panel. The inner panel is a composite structure that includes a metal sheet having a first face attached to a wallboard panel. Preferably, a sheet of self-healing material is attached to a second face of the metal sheet. A cavity formed between the outer and inner panels is filled with sand or another granular material. A flexible sheet suspended in the cavity provides additional protection. Preferably, a sheet of woven para-aramid fiber such as Kevlar® brand fiber is loosely attached to the flexible sheet to provide further protection.