Active Woven Materials Stimuli-Responsive Shape Transformation
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Solution Overview
Problem
Traditional methods for creating three-dimensional structures in materials are either manual or rely on the global pattern of the weave/knit/braid, lacking the ability to produce complex, adaptive shapes that can respond to environmental stimuli.
Innovation Solution
Active fabrics are developed by weaving, knitting, or braiding a combination of active and passive fibers that can autonomously transform in response to stimuli such as heat, moisture, or light, allowing for local or global shape changes, including changes in porosity and three-dimensional structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If traditional thermo-forming or molding methods are used to create three-dimensional structures, then the material can be forced into place, but the process requires manual operations and complex manufacturing procedures
Solution Approach 1:
The fabric structure performs self-forming operations through the autonomous transformation of active fibers when exposed to stimuli. The active fibers automatically adjust their configuration to create three-dimensional structures without requiring external manual thermo-forming or molding operations, enabling the material to form and reconfigure itself autonomously
Solution Approach 2:
The invention utilizes changes in physical parameters of active fibers (such as length, shape, or configuration) in response to environmental stimuli like heat, moisture, or light. These parameter changes drive the fabric structure to automatically transform into three-dimensional configurations, eliminating the need for complex manual manufacturing processes
2Shape
If traditional global weave patterns are used to produce three-dimensional structures, then the structure is determined by the overall pattern, but the ability to produce complex, adaptive shapes that respond to environmental stimuli is limited
Solution Approach 1:
The fabric structure divides the three-dimensional formation function into individual active fiber segments. Each active fiber independently responds to environmental stimuli and transforms locally, allowing the overall fabric to create complex adaptive shapes through the coordinated action of many independent segments rather than relying on a single global weave pattern
Solution Approach 2:
The invention transforms the static global weave pattern into a dynamic system where individual active fibers can autonomously change their configuration in response to environmental stimuli. This dynamic behavior enables the fabric to adapt its shape continuously based on real-time conditions, providing complex adaptive forms that traditional static patterns cannot achieve
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
Enables precise, repeatable, and adaptive three-dimensional transformations, reducing the need for manual labor and complex manufacturing processes, allowing for customizable and dynamic products that can change shape or porosity in response to environmental conditions.
Implementation Method 1
at least one of the active fibers exhibits a change in dimension responsive to exposure to a stimulus, the differential between the change in dimensions producing an autonomous, predefined physical transformation
Implementation Method 2
The external stimulus can be heat (e.g., a change in temperature), moisture, or light
Data Source
AI summary
Active fabrics typically include a plurality of fibers. At least one of the fibers exhibits a change in length or width upon exposure to an external stimulus, such as heat, moisture, or light. The active woven materials can exhibit local transformation, such as creating areas that are tighter or more open, or global transformation, such as changing from flat to curled. The effect is a precise and repeatable change in shape upon exposure to an external stimulus. Embodiments can be employed, for example, in sportswear, compression garments, furniture, and interior products.