Zero-Poisson Planar Structure for Stress Confinement
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Solution Overview
Problem
Existing technologies face challenges in designing complex structures with near-zero Poisson's ratio, which are essential for controlling stress and mechanical noise in electronic circuits and sensors, as they struggle to confine stress effectively.
Innovation Solution
A structure comprising a central pillar with radially extending branched connectors, featuring inclined segmental portions and legs that allow for variable angles, minimizing horizontal displacement when pressed, thereby achieving a near-zero Poisson's ratio through a specific geometric configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anisotropic or auxetic structures are used to achieve controlled Poisson's ratio, then stress control capability is improved, but structural design complexity increases and stress confinement becomes difficult
Solution Approach 1:
The structure is divided into multiple unit cells, each containing a central pillar, branched connectors, and legs. These unit cells are arranged in a periodic matrix pattern, allowing the complex zero Poisson's ratio behavior to be achieved through simple repeating units rather than a single complex structure.
Solution Approach 2:
The structure utilizes variable angles at the joints between central pillars, branched connectors, and legs. When vertical load is applied, these angles change dynamically, allowing the structure to adapt its geometry to achieve zero Poisson's ratio behavior while maintaining structural integrity.
2Reliability
If complex structures are designed to achieve near-zero Poisson's ratio, then stress confinement is improved, but manufacturing and design difficulty increases
Solution Approach 1:
The complex structure is segmented into identical or similar unit cells that can be manufactured independently and then assembled. Each unit cell contains standardized components (central pillar, branched connectors, legs) with consistent geometries, simplifying the manufacturing process while achieving the overall zero Poisson's ratio effect.
Solution Approach 2:
The structure achieves zero Poisson's ratio by carefully selecting and adjusting geometric parameters such as the lengths of segmental portions, angles between connectors and legs, and spacing between unit cells. These parameter optimizations allow the structure to achieve the desired mechanical behavior without requiring complex manufacturing processes.
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 structure effectively confines stress, reducing horizontal displacement and maintaining structural integrity under pressure, making it suitable for applications in electronic circuits and sensors where stress control is crucial.
Implementation Method 1
In one implementation of the first aspect, the structure includes an elastic structure. Thus, when the entire structure is made of the elastic material, each of an angle between the central pillar and the first segmental portion, an angle between the first segmental portion and the second segmental portion, and an angle between the second segmental portion and the leg is variable
Data Source
AI summary
Disclosed is a zero Poisson's ratio structure including a central pillar; at least two branched connectors extending radially from a lower end of the central pillar, wherein each of the branched connectors includes: a first segmental portion extending inclinedly upwardly or downwardly from the central pillar; and a second segmental portion extending inclinedly downwardly or upwardly from a distal point of the first segmental portion, wherein the extension directions of the first and second segmental portions are opposite to each other; and each leg extending perpendicularly downwardly from a distal point of each of the second segmental portions, wherein due to a force pressing the central pillar, each of an angle between the central pillar and the first segmental portion, an angle between the first segmental portion and the second segmental portion, and an angle between the second segmental portion and the leg is variable.