Composite ERA Enclosure with Offset Seams for Weight Reduction
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Solution Overview
Problem
Current reactive armor enclosures for military vehicles are heavy due to stainless steel construction, leading to significant weight addition and minimal protection, which is a concern for modern combat vehicles facing advanced threats.
Innovation Solution
Development of a lightweight fiber-reinforced composite explosive reactive armor (ERA) enclosure that uses multiple layers of fiber sheet material infused with resin, with strategically placed seams and attachment structures to provide strength and secure mounting to the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If stainless steel enclosures are used for reactive armor tiles, then strength and blast protection are improved, but weight increases significantly
Solution Approach 1:
The patent replaces traditional stainless steel enclosures with fiber-reinforced composite materials consisting of multiple plies of fiber sheet material (such as carbon fiber, glass fiber, or aramid fiber) bonded with resin matrix. This composite construction provides comparable or superior strength and blast protection while reducing enclosure weight by 60-80% compared to steel alternatives.
Solution Approach 2:
The patent implements variable fiber orientation and ply stacking sequences in different regions of the enclosure to optimize strength where needed. For example, higher fiber density and specific orientation patterns are applied in high-stress areas near corners and attachment points, while reducing material density in lower-stress regions, thereby achieving adequate protection with minimized weight.
2Strength
If thicker stainless steel enclosures are used, then blast resistance is improved, but vehicle dynamics and mobility deteriorate
Solution Approach 1:
The fiber-reinforced composite enclosure achieves equivalent or superior blast resistance to thick steel at a fraction of the weight. The high strength-to-weight ratio of composite materials (particularly carbon fiber composites) enables the enclosure to resist blast pressures while adding minimal mass to the vehicle, thereby preserving acceleration, top speed, and maneuverability characteristics.
Solution Approach 2:
The patent optimizes the thickness, fiber orientation, and resin composition parameters of the composite enclosure to achieve the minimum required blast protection level. By carefully controlling these parameters, the design achieves adequate blast resistance with optimized weight, avoiding both over-protection (excessive weight) and under-protection (insufficient strength).
3Strength
If multiple plies of fiber material are used with offset seams, then structural strength is improved, but manufacturing complexity increases
Solution Approach 1:
The enclosure is constructed from multiple discrete plies of fiber sheet material that are individually laid up and then bonded together with resin. Each ply can be manufactured and positioned separately, allowing for modular assembly and quality control. The offset seam pattern distributes stress across multiple layers, preventing single-point failure while maintaining manufacturability through standardized ply layouts.
Solution Approach 2:
The fiber plies are pre-cut and pre-positioned on the enclosure mold before resin infusion, with seam locations deliberately offset between layers. This preliminary arrangement of plies with staggered seams ensures optimal stress distribution and structural integrity before the bonding process begins, simplifying the overall manufacturing sequence while achieving superior structural 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 composite ERA enclosure offers substantial weight reduction while maintaining the ability to withstand detonations and provide adequate blast protection, improving vehicle dynamics and reducing the risk of secondary damage from adjacent tile detonations.
Implementation Method 1
The sidewalls are formed from a fiber-reinforced composite material having a plurality of plies of fiber sheet material
Implementation Method 2
The sidewalls are formed from a fiber-reinforced composite material having a plurality of plies of fiber sheet material, where each of the plies forms a portion of each of the sidewalls
Data Source
AI summary
An explosive reactive armor (ERA) enclosure for an ERA tile includes a bottom and a plurality of sidewalls extending from the bottom, where the plurality of sidewalls are continuous with each other and with the bottom so as to define an internal volume. The plurality of sidewalls are formed from a fiber-reinforced composite material having a plurality of plies of fiber sheet material. Additionally, a sidewall seam defined by abutting edges of the first ply is offset from a sidewall seam defined by abutting edges of the second ply. Methods of manufacturing ERA enclosures, including applying wrap layers and forming attachment structures for securing the fiber-reinforced composite ERA enclosure to an armor element, are also described. The composite enclosure is inexpensive and lightweight and improves the dynamic capabilities of armored vehicles using such ERA tiles.