Document Detail

Buckling-induced encapsulation of structured elastic shells under pressure.
MedLine Citation:
PMID:  22451901     Owner:  NLM     Status:  MEDLINE    
We introduce a class of continuum shell structures, the Buckliball, which undergoes a structural transformation induced by buckling under pressure loading. The geometry of the Buckliball comprises a spherical shell patterned with a regular array of circular voids. In order for the pattern transformation to be induced by buckling, the possible number and arrangement of these voids are found to be restricted to five specific configurations. Below a critical internal pressure, the narrow ligaments between the voids buckle, leading to a cooperative buckling cascade of the skeleton of the ball. This ligament buckling leads to closure of the voids and a reduction of the total volume of the shell by up to 54%, while remaining spherical, thereby opening the possibility of encapsulation. We use a combination of precision desktop-scale experiments, finite element simulations, and scaling analyses to explore the underlying mechanics of these foldable structures, finding excellent qualitative and quantitative agreement. Given that this folding mechanism is induced by a mechanical instability, our Buckliball opens the possibility for reversible encapsulation, over a wide range of length scales.
Jongmin Shim; Claude Perdigou; Elizabeth R Chen; Katia Bertoldi; Pedro M Reis
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2012-03-26
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  109     ISSN:  1091-6490     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-04-18     Completed Date:  2012-07-12     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5978-83     Citation Subset:  IM    
School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 021383, USA.
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MeSH Terms
Computer Simulation*
Elastic Modulus*
Finite Element Analysis
Models, Chemical
Models, Structural
Polyvinyls / chemistry*
Siloxanes / chemistry*
Stress, Mechanical
Reg. No./Substance:
0/Polyvinyls; 0/Siloxanes; 0/vinyl polysiloxane

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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