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SUMMARY:Shaping Shells with Spontaneous Curvature - Dr Douglas P. Holmes\,
  Mechanical Engineering\, Boston University  
DTSTART:20200522T140000Z
DTEND:20200522T153000Z
UID:TALK142426@talks.cam.ac.uk
CONTACT:Hilde Hambro
DESCRIPTION:Induced by proteins within the cell membrane or by differentia
 l growth\, heating\, or swelling\, spontaneous curvatures can drastically 
 affect the morphology of thin bodies and induce mechanical instabilities. 
 In this talk\, we aim to describe how the differential swelling of soft ma
 terials induces a spontaneous curvature that can dynamically shape materia
 ls. The dynamics of fluid movement within elastic networks\, and the inter
 play between swelling and geometry play a crucial role in the morphology o
 f growing tissues\, the shrinkage of mud and moss\, and the curling of car
 tilage\, leaves\, and pine cones. Small volumes of fluid that interact fav
 orably with a material can induce a spontaneous curvature that causes larg
 e\, dramatic\, and geometrically nonlinear deformations and instabilities\
 , yet\, the interaction of spontaneous curvature and geometric frustration
  in curved shells remains still poorly understood. This talk will examine 
 the geometric nonlinearities that occur as slender structures are exposed 
 to a curvature-inducing stimulus – surfaces crease\, fibers coalesce and
  curl apart\, plates warp and twist\, and shells buckle and snap. I will d
 escribe the intricate connection between materials and geometry\, and pres
 ent a straightforward means to permanently morph 2D sheets into 3D shapes.
  I will detail how curvature and pressure couple to either weaken or stren
 gthen shells. Finally\, I will describe the way elastic instabilities shap
 e the morphogenesis of the optic cup. If we can engineer adaptive structur
 es that programmatically morph on command we will enable opportunities for
  deployable structures\, soft robotic arms\, mechanical sensors\, and rapi
 d-prototyping of 3D elastomers.
LOCATION:https://us02web.zoom.us/j/81492263459  Meeting ID: 814 9226 3459
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