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SUMMARY:&quot\;Folded Shell Structures&quot\; - Mark Schenk\, PhD Student\
 , Structures Group
DTSTART:20111014T150000Z
DTEND:20111014T154500Z
UID:TALK33693@talks.cam.ac.uk
CONTACT:Lorna Everett
DESCRIPTION:C"By introducing a local texture (such as corrugations\, dimpl
 es\, etc.) to thin-walled shells\, their mechanical properties can be favo
 urably modified. A novel method of introducing such texture is the use of 
 tessellated Origami folding patterns.\n\nThe resulting Folded Shell Struct
 ures have a distinct structural hierarchy: globally they can be regarded a
 s thin-walled shells\, but at a meso scale they consist of tessellated uni
 t cells\, which in turn are composed of thin-walled shells joined at disti
 nct fold lines. It is the hierarchical interaction between the articulatio
 n at the fold lines and the deformation of the interlying facets\, which i
 mbues these shells with unconventional mechanical properties.\n\nThe intri
 guing mechanical properties of Folded Shell Structures are highlighted by 
 way of two example sheets. The fold patterns allow the sheets to undergo l
 arge deformations\, as well as change their global Gaussian curvature with
 out stretching the material. Furthermore\, both example sheets share the r
 emarkable property that their Poisson’s ratio under bending is of opposi
 te sign to that under extension.\n\nA simple numerical model is presented 
 to capture the key deformation modes of the folded shell structures\, whic
 h represents the fold patterns as a pin-jointed truss. The salient kinemat
 ics of the sheets are then described in terms of their unit cell deformati
 ons\, and a modal analysis of the sheets studies the effects of geometry a
 nd material properties. Lastly\, an important challenge is the manufacture
  of these folded shell structures\; a novel manufacturing method is descri
 bed to fold these shell structures  from sheet metal."
LOCATION:Engineering Department - **LR4**
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