Auxetic Composite Material Impact Resistance
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Solution Overview
Problem
Conventional personal safety equipment materials lack sufficient impact resistance and energy absorption, leading to inadequate protection against impacts and vibrations, which can cause fatigue and discomfort for users.
Innovation Solution
Development of an enhanced auxetic composite material (EACM) combining a base thermoplastic elastomer with auxetic materials, formed through molding processes that encapsulate or fill voids within the auxetic structures, enhancing impact performance and energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional materials are used in personal safety equipment, then the equipment is simple and easy to manufacture, but the impact resistance and energy absorption are insufficient
Solution Approach 1:
The patent applies composite materials by combining auxetic material with base material (such as thermoplastic elastomer or thermoset material) to create an enhanced auxetic composite material (EACM). This composite structure provides superior impact resistance and energy absorption compared to conventional single materials, while the base material encapsulates or fills the voids within the auxetic structure to optimize performance.
Solution Approach 2:
The patent applies local quality by creating regions with different material properties within the EACM. The auxetic material provides specific energy absorption characteristics in certain regions, while the base material provides structural support and fills voids in other regions. This localized differentiation of material properties optimizes both impact resistance and energy absorption throughout the structure.
2Loss of energy
If conventional materials are used in personal safety equipment, then the manufacturing process is simple, but the energy absorption capability is inadequate
Solution Approach 1:
The patent applies preliminary action by pre-forming the auxetic material structure before combining it with the base material. The auxetic material is manufactured with its characteristic negative Poisson's ratio structure in advance, then integrated with the base material through molding processes. This preliminary preparation allows the complex energy-absorbing structure to be created without significantly complicating the overall manufacturing process.
Solution Approach 2:
The patent applies parameter changes by utilizing the unique mechanical properties of auxetic material, specifically its negative Poisson's ratio. This parameter change in material behavior allows the structure to expand in thickness when stretched, creating an energy absorption mechanism that conventional materials cannot provide. The molding process parameters are optimized to accommodate this unique material behavior.
3Object-affected harmful factors
If conventional materials are used, then the material structure is simple, but the protection against vibrations and impacts is insufficient
Solution Approach 1:
The patent applies composite materials to protect against harmful factors by combining auxetic material with base material to create EACM. This composite structure provides superior protection against impacts and vibrations through the synergistic effects of the auxetic structure's energy absorption and the base material's structural support, significantly reducing the transfer of vibrational energy to the user.
Solution Approach 2:
The patent applies the blessing in disguise principle by converting the harmful effects of impacts and vibrations into beneficial energy absorption. The auxetic material's unique deformation behavior transforms impact energy into thickness expansion, dissipating the harmful energy away from the user's body and reducing fatigue and discomfort.
4Strength
If auxetic material is combined with base material through molding processes, then impact performance is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by preparing the auxetic material structure in advance before the molding process. The auxetic material is pre-formed with its characteristic structure, then integrated with the base material through injection molding or similar processes. This preliminary preparation simplifies the overall manufacturing by separating the complex auxetic structure creation from the composite material bonding process.
Solution Approach 2:
The patent applies the intermediary principle by using the base material as a mediator that encapsulates or fills the voids within the auxetic structure. This base material acts as an intermediary substance that bonds the auxetic material to the surrounding structure, facilitating the integration of the two different materials through standard molding processes without requiring complex assembly steps.
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 EACM provides superior impact resistance and energy absorption, reducing the transfer of vibrational energy and enhancing comfort and protection in personal protection equipment, such as gloves and helmets, by consolidating and dispersing impact energy effectively.
Implementation Method 1
the base material is injected or dripped into or injected, dripped or formed around the auxetic material
Implementation Method 2
auxetic materials, with their negative Poisson's ratio, become thicker in response to applied stretching forces
Implementation Method 3
the composite material providing higher impact performance than the individual materials
Data Source
AI summary
Apparatus and associated methods relate to an enhanced auxetic composite material (EACM) of a base thermoplastic elastomer (TPE) and/or a thermoset material combined with an auxetic material, the composite formed with a molding process, where the base material is injected or dripped into or injected, dripped or formed around the auxetic material, the composite material providing higher impact performance than the individual materials. In an illustrative example, combining various energy absorbing materials with auxetic materials may further enhance impact performance. In some examples, TPE material injected into auxetic structures may fill internal voids. In some examples, the auxetic material may be suspended within the TPE material and be encapsulated around the auxetic material form. Auxetic materials may take various forms, for example, sheets, 3-D structures, and particles, each providing unique benefits. Various embodiments included within various personal protection articles may advantageously provide long life and enhance impact resistance.