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SUMMARY:New Horizons in Microarchitectured  Materials  -  Prof Norman Flec
 k\, Cambridge University
DTSTART:20200527T140000Z
DTEND:20200527T153000Z
UID:TALK142282@talks.cam.ac.uk
CONTACT:Hilde Hambro
DESCRIPTION:Microarchitectured materials possess a broad spectrum of mecha
 nical\, thermal and electrical properties due to their combination of topo
 logy\, length scale and composition.  Their topology ranges from closed ce
 ll  3D shell-structures (such as 3D foams) to  open-cell lattices.  Nodal 
 connectivity has a major effect upon properties\, and length scales can be
  at play in dictating strength and toughness  when the cell size is reduce
 d from metre-scale to nanoscale. \n\nNo strict bounds exist for the toughn
 ess of micro-architectured materials\, and a high toughness can be achieve
 d by the successive renucleation of fracture in the lattice ahead of a mac
 roscopic crack tip.  Likewise\, there are no theoretical bounds for tensil
 e ductility.  Extreme properties\, such as high strength are evident with 
 a diminishing length scale\, but new challenges (such low toughness) also 
 appear. The advent of additive manufacture has opened up the opportunity o
 f varying the topology and material choice within a shaped part. However\,
  current manufacturing methods introduce defects into the cell walls that 
 reduce the strength of the component.  The sensitivity of strength to as-m
 anufactured and as-designed defects are explored for an idealised lattice 
 made by laser cutting.  Additive manufacture also allows for the opportuni
 ty to tailor microstructure in order to give a stress versus strain curve 
 upon demand.  \n\nIn this talk the following research questions are addres
 sed:\n\n1.	How can one design with microarchitectured materials?  (How do 
 we mitigate against stress raisers?)\n\n2.	What is the appropriate fractur
 e mechanics methodology for these materials?  (When does a crack tip J-fie
 ld exist?)\n\n3.	What benefit can be obtained from inter-penetrating latti
 ce materials?  (What is the effect of the infiltration of an open-cell lat
 tice by a second phase upon macroscopic properties?)\n\n\n\n\n
LOCATION:Zoom Discussion https://harvard.zoom.us/j/271079684
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