Twisted Polymeric Tape for Ballistic Resistance
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Solution Overview
Problem
Traditional non-woven composites for ballistic resistance face limitations in achieving high ultimate tensile strength (UTS) while maintaining high ultimate elongation percentage (UE %), leading to reduced energy absorption and versatility, especially when molded into curved shapes.
Innovation Solution
The development of a polymeric tape comprising twisted and bonded continuous polymeric filaments, with a flattened multi-filament yarn structure that achieves an UTS of at least 15 g/denier and a UE % that is proportional to the UTS, forming a tape with a high UTS*UE value, which is then consolidated into a planar layer using heat and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If resin coating is used to bind fibers together in non-woven composites, then the fibers remain bound together, but the overall fiber content is reduced and ballistic resistance efficiency decreases
Solution Approach 1:
The invention extracts and removes the resin coating from the composite structure, replacing it entirely with a thermoplastic polymeric matrix that serves the same binding function without reducing fiber content. This extraction eliminates the harmful substitution of high-strength fibers with lower-performance resin material.
Solution Approach 2:
The invention changes the material parameter from resin coating to thermoplastic polymeric matrix, fundamentally altering the binding mechanism. This parameter change allows the matrix to penetrate and bond fibers more effectively while maintaining 100% fiber content, thereby improving ballistic resistance efficiency.
2Strength
If 0°/90° cross-plying construction is used to achieve greater ballistic penetration resistance, then ballistic performance improves, but delamination occurs when molded into curved contours
Solution Approach 1:
The invention changes the matrix material parameter to a thermoplastic polymeric matrix with specific flow and bonding characteristics that enable both curved molding and delamination resistance. This parameter change allows the composite to adapt to curved contours while maintaining structural integrity through superior matrix-fiber bonding.
Solution Approach 2:
The invention creates a new composite material system combining continuous high-strength fibers with a thermoplastic polymeric matrix, resulting in a material that exhibits both enhanced ballistic resistance and improved formability. This composite structure eliminates the delamination issue while maintaining strength through optimized fiber-matrix integration.
3Strength
If high ultimate tensile strength fibers are used, then ballistic resistance improves, but ultimate elongation decreases, reducing energy absorption
Solution Approach 1:
The invention creates a composite material system where the thermoplastic polymeric matrix contributes to elongation while the high-strength fibers provide tensile strength. This composite structure enables the material to achieve both high strength and high elongation, maximizing energy absorption capability.
Solution Approach 2:
The invention changes the matrix material parameter to a thermoplastic polymeric matrix that exhibits favorable viscoelastic properties, enabling the composite to achieve both high ultimate tensile strength and high ultimate elongation. This parameter change allows the material to dissipate more energy during deformation.
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 resulting polymeric tapes exhibit enhanced ballistic resistance and versatility by maintaining high UTS and UE % values, allowing for improved energy absorption and resistance against projectiles, while being suitable for curved applications without delamination.
Implementation Method 1
consolidated into a substantially planar, unitary layer
Implementation Method 2
consolidated into a substantially planar, unitary layer
Data Source
AI summary
High tenacity, high elongation multi-filament polymeric tapes as well as ballistic resistant fabrics, composites and articles made therefrom. The tapes are fabricated from multi-filament fibers/yarns that are twisted together, bonded together, compressed and flattened.