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XX2.02 - Creating 3D Structures from SMA-Based Self-Folding Reprogrammable Sheets 
Date/Time:
April 22, 2014   11:00am - 11:30am
 
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Origami engineering--the practice of creating useful 3D structures through folding and fold-like operations on 2D building-blocks--has the potential to improve the design of engineered systems in many ways. Potential advantages include reduced manufacturing complexity (reduced part count, improved assembly via collapsible/deployable parts), the capability to create structures at small scales (microscale and nanoscale folding and self-assembly), the capability to create deployable structures that fold compactly for storage (solar arrays and other space structures), and the potential to create structures that are highly resilient through their capability to perform in-situ reconfiguration. This talk will describe a concept for a self-folding reprogrammable sheet for use in origami engineering applications. The sheet is a laminate structure consisting of a compliant medium sandwiched between two shape memory alloy (SMA) mesh layers. The SMA layers are thermally actuated, with the final 3D structure determined by the locations, durations, and sequencing of applied heat. The direction of actuation is determined by whether heat is applied to the top or bottom SMA layer. Folds are approximated by localized deformations in the sheet. These are fully reversible, allowing the sheets to be fully reprogrammable. The talk will cover the design and analysis of the sheets and present results from fabrication, testing, and applications.
 


 
 
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