Auxetic Substrate With Elastic Sheets For Uniform Strain
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Solution Overview
Problem
Stretchable electronic substrates with a negative Poisson's ratio face non-uniform stress distribution across pixel sections when stretched, leading to distortion and reduced lifespan due to mechanical separation of elements.
Innovation Solution
A stretchable substrate is manufactured by forming an auxetic structure with a chiral design and attaching elastic sheets to both surfaces, incorporating central holes filled with elastic bodies and a lubricant or air gap to ensure uniform strain distribution and minimize distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an auxetic structure with chiral design is used to achieve negative Poisson's ratio, then strain control in in-plane direction is improved, but non-uniform stress distribution across pixel sections occurs
Solution Approach 1:
The substrate is divided into multiple unit structures, each containing pixel sections with specific geometric patterns. By segmenting the substrate into repeating units with optimized geometries, the patent achieves uniform stress distribution across different pixel sections while maintaining the overall negative Poisson's ratio effect at the macro level.
Solution Approach 2:
Different regions of the substrate are designed with locally optimized properties. The unit structures incorporate varying geometric parameters in different areas to ensure that each pixel section experiences uniform stress distribution, while the collective arrangement maintains the desired macroscopic strain control characteristics.
2Manufacturing precision
If auxetic structure is stretched to control strain in in-plane direction, then negative Poisson's ratio is achieved, but distortion and warpage occur due to non-uniform tensile elongation
Solution Approach 1:
The unit structures incorporate asymmetric geometric patterns that compensate for the non-uniform deformation tendencies of auxetic materials. By carefully designing the asymmetric arrangement of geometric elements within each unit structure, the patent balances the tensile elongation across different pixel sections, preventing distortion and warpage while maintaining the negative Poisson's ratio effect.
Solution Approach 2:
The geometric parameters of the unit structures are optimized to dynamically adapt to the deformation behavior of the auxetic material. The design allows the structure to maintain uniform stress distribution throughout the stretching process, with the geometric elements adjusting their configuration to prevent localized distortion and warpage.
3Adaptability or versatility
If elements are positioned on stretchable substrate, then functional integration is improved, but mechanical separation occurs due to non-uniform stress, reducing lifetime
Solution Approach 1:
The patent incorporates stress-distributing geometric features in advance within the unit structures, which act as cushioning elements to prevent mechanical separation. By designing the substrate with built-in stress-management capabilities before assembly, the patent protects positioned elements from the harmful effects of non-uniform stress distribution, thereby extending device lifetime while maintaining functional integration.
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 achieves uniform strain across the substrate, reducing pixel distortion and extending the lifespan of stretchable electronic devices by maintaining mechanical stability under various deformation conditions.
Implementation Method 1
an elastic substrate, of which, when stretched in one axial direction, a strain in another axial direction is controllable, that is, an elastic substrate having a negative Poisson's ratio
Implementation Method 2
a stretchable substrate using an auxetic structure, when the stretchable substrate is stretched, a strain may be controlled in an in-plane direction perpendicular to a stretching direction
Implementation Method 3
attaching one or more elastic sheets to both surfaces of the auxetic and forming a stretchable substrate
Implementation Method 4
a lubricant provided between each elastic body and each central hole corresponding to one of the plurality of unit structures
Data Source
AI summary
Disclosed is a method of manufacturing a stretchable substrate having improved stretch uniformity according to various embodiments of the present disclosure in order to implement the above-described object. The method may include forming an auxetic including a plurality of unit structures, and attaching one or more elastic sheets to the auxetic and forming a stretchable substrate.