Auxetic Stretchable Substrate for Multidirectional Strain Control
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Solution Overview
Problem
Stretchable electronic devices face challenges in maintaining mechanical stability and minimizing distortion during deformation, particularly in multidimensional axis directions, due to the lack of control over strain distribution across axes.
Innovation Solution
A stretchable substrate with a negative Poisson's ratio is developed, utilizing a mechanical metamaterial auxetic structure that includes a plurality of unit structures and an internal elastomer, which is adhered to an elastic sheet, allowing for controlled strain distribution across axes and minimizing surface distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional flexible substrate is used, then the substrate can be deformed in one direction, but the substrate cannot control strain distribution across multiple axes and exhibits distortion during deformation
Solution Approach 1:
The substrate is divided into multiple unit structures arranged in a grid pattern, where each unit structure can independently deform. This segmentation allows the substrate to achieve complex multidimensional deformation while maintaining overall structural stability and controlling strain distribution across different axes.
Solution Approach 2:
The invention transitions from conventional two-dimensional planar deformation to three-dimensional deformation by incorporating vertical displacement of the unit structures. This dimensional change enables the substrate to distribute strain across multiple axes and maintain mechanical stability during deformation.
2Adaptability or versatility
If the substrate is made more flexible to increase deformation freedom, then the substrate can deform in multiple directions, but the substrate loses mechanical stability and increases distortion
Solution Approach 1:
By segmenting the substrate into discrete unit structures with defined geometric patterns, the invention enables precise control over deformation behavior. Each unit structure's geometry can be optimized to achieve desired strain distribution, maintaining manufacturing precision while enabling multidirectional deformation.
Solution Approach 2:
The invention changes the structural parameters of the substrate by introducing specific unit structure geometries and arrangements. These parameter changes allow the substrate to maintain mechanical stability while achieving enhanced deformation freedom across multiple axes.
3Stability of the object's composition
If a rigid substrate is used, then the substrate maintains mechanical stability, but the substrate cannot be freely deformed in multiple directions
Solution Approach 1:
The invention uses a flexible substrate with a specific thickness range that allows bending and deformation while maintaining structural integrity. The flexible substrate serves as a base that enables multidirectional deformation without compromising mechanical stability.
Solution Approach 2:
The substrate combines a flexible base material with a structured surface pattern of unit structures. This composite structure integrates the flexibility needed for multidirectional deformation with the geometric stability required to control strain distribution and prevent distortion.
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 substrate effectively maintains mechanical stability and reduces surface distortion during deformation, enhancing the usability of stretchable devices in various applications, including flexible displays, by distributing mechanical strain in a three-dimensional vertical direction.
Implementation Method 1
a stretchable substrate capable of controlling, upon stretching along one axis, a strain related to another axis by generating an elastic substrate containing a mechanical metamaterial having a negative Poisson ratio
Implementation Method 2
generating an auxetic including a plurality of unit structures and adhering one or more elastic sheets to one surface of the auxetic
Data Source
AI summary
Disclosed is a method of manufacturing a stretchable substrate according to various embodiments of the present disclosure for realizing the above-described objectives. The method may include generating an auxetic including a plurality of unit structures and adhering one or more elastic sheets to one surface of the auxetic.