Bistable Reconfigurable Structures for Multi-Axial Deformation
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Solution Overview
Problem
Current shape-reconfigurable materials and structures are limited in their ability to morph in terms of allowable direction and amplitude of deformation, making them inefficient for applications requiring multi-axial straining and energy absorption.
Innovation Solution
The development of bistable shape-reconfigurable structures with living hinges that enable independent multi-axial deformation, allowing for reversible transition between two stable orientations and enabling the creation of complex multistable structures and mechanisms with enhanced energy-absorption capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional shape-reconfigurable structures (origami, tensegrity) are used, then they can achieve shape change, but their deformation is limited in direction and amplitude
Solution Approach 1:
The structure is divided into multiple bistable unit cells, each capable of independent deformation. These unit cells are arranged in arrays where they can deform independently or collectively, enabling multi-axial straining while maintaining overall structural integrity through the modular design
Solution Approach 2:
The structure transitions from static to dynamic behavior through bistable mechanisms that allow reversible switching between two stable states. This dynamic capability enables the structure to adapt its shape in multiple directions and amplitudes while returning to stable configurations, resolving the contradiction between adaptability and stability
2Adaptability or versatility
If rigid folding mechanisms are used for origami, then they can achieve shape reconfiguration, but they are energetically inefficient for multi-axial straining
Solution Approach 1:
The invention changes the mechanical parameters of the unit cells to exhibit bistable behavior with energy barriers between stable states. This allows the structure to maintain deformed configurations without continuous energy input, improving energy efficiency while enabling multi-axial deformation through the controlled transition between stable states
3Volume of moving object
If shape-reconfigurable structures are compressed for transport, then they reduce transportation cost, but they require significant deformation capability
Solution Approach 1:
The structure is segmented into collapsible unit cells that can be compressed into compact configurations for transport. Each unit cell maintains its bistable characteristics, allowing the entire structure to achieve significant volume reduction while preserving the ability to deform to full amplitude when deployed
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 structures can achieve significant volumetric and morphological changes, offering improved energy absorption and strength while maintaining reversibility, which is critical for various applications including energy absorption and load-bearing scenarios.
Implementation Method 1
bistable shape-reconfigurable structures with living hinges that enable independent multi-axial deformation, allowing for reversible transition between two stable orientations
Data Source
AI summary
In one embodiment, a shape-reconfigurable structure includes a rigid base having first and second ends, a rigid first beam having a lateral end and a central end, the lateral end being connected to the first end of the base, and a rigid second beam having a lateral end and a central end, the lateral end of the second beam being connected to the second end of the base and the central end of the second beam being connected to the central end of the first beam, wherein the structure can be placed in an expanded orientation in which the first and second beams extend outward away from the base and a contracted orientation in which the first and second beams extend inward toward the base.