3D Chiral Auxetic Cell Structures for Multi-Plane Deformation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional materials with positive Poisson's ratio do not effectively exhibit auxetic properties in multiple planes when subjected to forces, limiting their ability to change dimensions in a manner beneficial for specific applications.
Innovation Solution
The development of auxetic materials with chiral structures, such as polygonal and cuboid cells, that include intersecting cross-members and legs capable of rotation, allowing for negative Poisson's ratio behavior in multiple planes when forces are applied, thereby altering volume and surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional materials with positive Poisson's ratio are used, then the material structure is simple and easy to manufacture, but the material cannot exhibit auxetic properties in multiple planes when subjected to forces
Solution Approach 1:
The material is divided into repeating unit cells, each containing chiral structures with cross-members and legs. This segmentation allows each unit cell to independently exhibit auxetic behavior in multiple planes while maintaining overall material simplicity and manufacturability through repetition of the basic unit.
Solution Approach 2:
Chiral structures with asymmetric cross-member and leg configurations are introduced into the unit cells. This asymmetry enables the structures to rotate and deform differently in response to forces applied in different directions, thereby exhibiting auxetic properties in multiple planes rather than being limited to a single plane.
2Adaptability or versatility
If auxetic materials with chiral structures are used, then negative Poisson's ratio behavior in multiple planes is achieved, but the manufacturing complexity increases
Solution Approach 1:
The patent explores different geometric parameters of the chiral structures, such as the number of cross-members and legs, their lengths and angles, and the configuration of joints. By optimizing these parameters, the material achieves multiple-plane auxetic behavior while attempting to balance manufacturing complexity. For example, varying the number of cross-members from 2 to 4 and adjusting leg angles allows tuning of auxetic properties.
Solution Approach 2:
The invention combines multiple structural elements (cross-members, legs, joints) within each unit cell to create a composite micro-structure that exhibits auxetic properties. This composite approach allows the material to achieve complex mechanical behavior through the interaction of simpler components, potentially facilitating manufacturing through modular assembly or additive manufacturing techniques.
3Productivity
If conventional materials are used, then the material is isotropic and uniform, but the material cannot efficiently deform and change volume in response to applied forces
Solution Approach 1:
The chiral structures within the unit cells are designed to be dynamically responsive to applied forces. When force is applied, the cross-members and legs rotate and reconfigure, allowing the material to efficiently deform and change volume. This dynamic behavior contrasts with conventional static, uniform materials that deform uniformly in all directions regardless of loading conditions.
Solution Approach 2:
The patent transitions from conventional two-dimensional auxetic patterns to three-dimensional chiral structures with cross-members extending in multiple directions. This dimensional enhancement allows the material to exhibit auxetic behavior in multiple planes simultaneously, improving deformation efficiency by utilizing three-dimensional space rather than being constrained to a single plane.
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
These auxetic materials demonstrate negative Poisson's ratio in multiple planes, enabling efficient deformation and volume change in response to tensile and compressive forces, enhancing their mechanical properties and adaptability.
Implementation Method 1
an auxetic polygonal cell may have a plurality of chiral structures capable of rotation
Implementation Method 2
demonstrate negative Poisson's ratio in multiple planes, enabling efficient deformation and volume change in response to tensile and compressive forces
Data Source
AI summary
An auxetic polygonal cell may have a plurality of chiral structures capable of rotation. The plurality of chiral structures may at least partially enclose a volume. Each of the chiral structures may include a first cross member having a first set of distal ends and a second cross member intersecting the first cross member, the second cross member having a second set of distal ends. The chiral structures may also include a first set of legs, wherein each leg of the first set of legs extends from at least one distal end of the first set of distal ends and a second set of legs, wherein each leg of the second set of legs extends from at least one distal end of the second set of distal ends.