Programmable Stretchable Surfaces for Controlled 3D Texture Morphing
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Solution Overview
Problem
Designing and controlling the transformation of 2D stretchable surfaces into complex 3D non-Euclidean shapes is challenging due to the non-linear mechanics and lack of computationally efficient models for predicting the final shape of inflated elastomeric surfaces.
Innovation Solution
The development of synthetic tissue groupings using stretchable elastomeric membranes embedded with inextensible mesh, which are pneumatically actuated to transform into programmed 3D textures, mimicking natural shapes and camouflaging into background environments through the CCOARSE mechanism, which constrains circumferential strain and allows for one-to-one mapping from radial stretch to target 3D shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If pneumatic actuation is used to transform 2D elastomeric surfaces into 3D shapes, then fast actuation rates and high energy density are achieved, but the non-linear mechanics and large number of configurations make it difficult to predict and control the final shape
Solution Approach 1:
The patent applies preliminary action by pre-programming the mesh pattern geometry and distribution on the 2D elastomeric surface before actuation. The mesh structure is designed in advance with specific geometric parameters and spatial arrangements that predetermined the target 3D shape configuration. When pneumatic actuation is applied, the pre-designed mesh pattern guides the deformation process, ensuring the surface transforms to the intended shape rather than allowing random deformation among multiple possible configurations.
Solution Approach 2:
The patent employs parameter changes by systematically varying mesh geometric parameters (such as mesh density, cell size, pattern geometry) and their spatial distributions across the elastomeric surface. By adjusting these parameters, the final 3D shape characteristics (curvature, height, surface area) can be precisely controlled. The relationship between mesh parameters and resulting shape parameters establishes a design framework for predicting and controlling the transformed configuration.
2Manufacturing precision
If complex mesh patterns are embedded to achieve precise 3D shape control, then shape accuracy is improved, but the fabrication complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies segmentation by dividing the continuous elastomeric surface into discrete regions defined by the mesh pattern. The mesh structure itself segments the surface into multiple cells or zones, each capable of independent deformation control. This segmentation allows complex global shapes to be achieved through simpler local mesh单元 designs, and enables modular fabrication approaches where mesh patterns can be standardized and replicated across different surface areas.
Solution Approach 2:
The patent implements local quality by varying the mesh pattern characteristics (density, geometry, orientation) at different locations on the elastomeric surface according to the desired local curvature and shape requirements. Areas requiring higher curvature or more complex deformation receive denser or specially configured mesh patterns, while flatter regions use sparser patterns. This localized optimization achieves high overall shape accuracy without uniformly increasing fabrication complexity across the entire surface.
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
This method enables reversible transformation of 2D surfaces into complex hierarchical 3D shapes with high accuracy and versatility, achieving dynamic inflation and camouflage capabilities, suitable for various applications including intelligent catheters and reconfigurable surfaces.
Implementation Method 1
The fiber mesh acts as local connective tissue fiber reinforcement that provides a force towards the synthetic skin's central axis and controls the 3D shape
Implementation Method 2
pneumatically actuated composites of mesh embedded elastomers
Implementation Method 3
pneumatic actuation of stretchable elastomers
Data Source
AI summary
The present disclosure may be embodied as a method for creating a restriction pattern from a mask material having a strain (εmask) an for mapping elastomeric membrane having a strain (εmembrane) into a target 3D shape. The method may include discretizing the target 3D shape into a plurality of radial segments, and a radial strain (εr) is determined for each radial position (r) on each radial segment of the plurality of radial segments. A restriction pattern is determined, wherein the restriction pattern comprises a quantity of mask material for each position r to provide a composite strain (εmask, εsilicone). In some embodiments, the method further includes depositing a first membrane layer into a mold and placing mask material into the first membrane layer according to the determined restriction pattern. The first membrane layer is cured.