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SUMMARY:Microstructure for continuous and localised intrinsic curvature cr
 eation – “strong” micromechanics - Prof Mark Warner\, Cavendish Labo
 ratory\, Cambridge
DTSTART:20190125T140000Z
DTEND:20190125T150000Z
UID:TALK118201@talks.cam.ac.uk
CONTACT:Hilde Hambro
DESCRIPTION:Nematic elastomers and glasses hugely and reversibly contract/
 elongate parallel/perpendicular to their directors under heating or illumi
 nation. With uniform directors and as slender sheets\, they can pull with 
 huge load-to-weight ratios\, but cannot push because of Euler instabilitie
 s.\nFor complex tasks at small scales\, the material must be the machine i
 tself . We show how to design continuous\, non-uniform director fields ena
 ble flat sheets to develop intrinsic curvature \, \, that is mostly contin
 uously distributed\, and thereby adopt complex shapes. Likewise\, piecewis
 e-continuous fields give Gaussian curvature localised at points \, much as
  origami folding of paper does. But in this case the “origami” is inst
 ead non-isometric .\nThe blocking of emerging non-developable surfaces cau
 ses stretch away from the new metric and the response can be strong pullin
 g\, but also strong pushing  without Euler failures. New micromechanical p
 ossibilities arise.\n
LOCATION:Oatley Seminar Room\, Department of Engineering
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