Auxetic Shin Guard Unit Structure for Energy Absorption
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Solution Overview
Problem
Existing auxetic materials face challenges in their application due to inherent drawbacks, limiting their effectiveness and suitability for protective sports equipment.
Innovation Solution
A novel unit structure for auxetic materials comprising first and second strut elements connected at a predetermined re-entrant angle, forming a shin guard with enhanced energy absorption and fracture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional materials with positive Poisson's ratio are used, then the material structure is simple and easy to manufacture, but the energy absorption and fracture resistance are insufficient for protective sports equipment
Solution Approach 1:
The auxetic material is divided into repeating unit structures, each comprising first and second strut elements connected at re-entrant angles. This segmentation allows the complex auxetic behavior to be achieved through standardized, manufacturable units that can be assembled into larger protective structures
Solution Approach 2:
The patent creates a composite structure combining strut elements with specific geometric configurations (re-entrant angles) to achieve auxetic properties. This composite approach integrates structural geometry with material behavior to provide enhanced energy absorption and fracture resistance while maintaining manufacturability
2Strength
If auxetic materials with negative Poisson's ratio are used, then the energy absorption and fracture resistance are improved, but the manufacturing complexity and difficulty increase
Solution Approach 1:
By segmenting the auxetic material into discrete unit structures with first and second strut elements, the patent simplifies manufacturing. Each unit can be fabricated using standardized processes like 3D printing, and the repeating nature of the units reduces overall manufacturing complexity while maintaining the negative Poisson's ratio effect
Solution Approach 2:
The patent controls the re-entrant angle parameter in the unit structure to optimize both the auxetic effect and manufacturability. By adjusting this geometric parameter, the material achieves the desired negative Poisson's ratio while remaining compatible with standard manufacturing processes
3Strength
If complex auxetic unit structures are used, then the energy absorption capability is enhanced, but the uniformity of deflection and protection performance varies
Solution Approach 1:
The use of repeating unit structures ensures uniform distribution of the auxetic effect throughout the material. Each unit undergoes similar deformation patterns at the re-entrant angles, creating consistent deflection behavior across the entire protective structure while maintaining high energy absorption capability
Solution Approach 2:
The patent achieves homogeneous deformation characteristics by using identical first and second strut elements with consistent re-entrant angles throughout the material. This homogeneity ensures uniform deflection and consistent protection performance across different regions of the protective equipment
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 unit structure provides improved energy absorption and uniform deflection, offering superior protection and customization for sports equipment like shin guards through 3D printing with auxetic materials.
Implementation Method 1
Poisson's ratio is a measure of the Poisson effect, which is the deformation (expansion or contraction) of material in directions perpendicular to the specific direction of loading. Auxetics are structures or materials with a negative Poisson's ratio. This means that, when stretched, auxetics are structures or materials that tend to become thicker perpendicular to the applied force.
Implementation Method 2
auxetics are structures or materials with a negative Poisson's ratio. This means that, when stretched, auxetics are structures or materials that tend to become thicker perpendicular to the applied force. Such materials and structures are expected to have mechanical properties such as high energy absorption and fracture resistance.
Data Source
AI summary
An article made from an auxetic material, the auxetic material having a plurality of unit structures joined together, is provided. The unit structure includes a first strut element, and a second strut element joined to the first strut element. Each of the first strut element and the second strut element have a predetermined thickness and width, wherein the first strut element being connected to the second strut element at a predetermined re-entrant angle (⊖). Further, the first strut element includes a top first strut element, and a bottom first strut element, and the second strut element includes a set of top second strut elements and a set of bottom second strut elements and wherein the strut element of the set of top second strut elements being connected to respective strut member of the set of bottom second strut elements.