Auxetic Stretchable Substrate With Flexible Joint Structure
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Solution Overview
Problem
Existing stretchable substrates with auxetic structures face challenges in achieving uniform stress distribution during stretching, leading to non-uniform deformation and potential stress concentration issues.
Innovation Solution
A method of manufacturing an auxetic stretchable substrate with a flexible joint structure, involving the formation of a substrate with elastic material, differential patterning to create regions with varying lengths, and the incorporation of flexible joints with varying Young's moduli to ensure uniform stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an auxetic structure is used to achieve negative Poisson's ratio, then strain control in the vertical direction is improved, but stress distribution uniformity deteriorates
Solution Approach 1:
The patent introduces flexible joints with varying Young's moduli at specific locations within the auxetic structure. By making the joint properties spatially variable rather than uniform, the structure achieves both negative Poisson's ratio behavior and improved stress distribution uniformity. The flexible joints are strategically positioned to address stress concentration areas while maintaining the overall auxetic response.
Solution Approach 2:
The patent modifies the mechanical parameters (Young's modulus) of the flexible joints to create a gradient or varied distribution pattern. By changing the stiffness parameter spatially, the structure optimizes both its auxetic performance and stress distribution characteristics, resolving the contradiction between strain control and stress uniformity.
2Manufacturing precision
If uniform stress distribution is achieved through flexible joints, then deformation uniformity is improved, but device complexity increases
Solution Approach 1:
The patent divides the auxetic structure into multiple unit cells with embedded flexible joints. This segmentation allows the complex stress distribution problem to be addressed at a localized level within each unit cell, making the overall structure more manageable while achieving uniform deformation across the entire substrate.
Solution Approach 2:
The flexible joints act as intermediary elements between the rigid auxetic unit cells. These joints mediate the stress transmission, distributing loads more uniformly across the structure. By introducing this intermediate layer with controlled mechanical properties, the patent achieves deformation uniformity without requiring complete redesign of the entire auxetic structure.
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 solution enables uniform control of Poisson's ratio across the substrate, preventing stress concentration and non-uniform deformation, thereby enhancing mechanical stability and design flexibility.
Implementation Method 1
allowing a uniform induced stress distribution for each position when a substrate is stretched
Implementation Method 2
a substrate made of an elastic material
Implementation Method 3
an elastic substrate having a negative Poisson's ratio
Implementation Method 4
a mechanical metamaterial having an auxetic structure
Implementation Method 5
deformation deviation may be different
Implementation Method 6
the plurality of flexible joints may be formed of different materials having different Young's moduli
Data Source
AI summary
Disclosed herein is a method of manufacturing an auxetic stretchable substrate with a flexible joint structure according to various embodiments of the present invention. The method includes preparing a substrate made of an elastic material, and forming an auxetic to form a plurality of first regions on the substrate, each of the plurality of first regions is a region in which a material constituting the auxetic is not printed, and at least some of the plurality of first regions have different lengths.