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SUMMARY:Mechanics of Architected Materials Across Length and Time Scales -
  Prof Carlos M Portela\, School of Engineering\, MIT
DTSTART:20220225T140000Z
DTEND:20220225T150000Z
UID:TALK167885@talks.cam.ac.uk
CONTACT:Hilde Hambro
DESCRIPTION:Architected materials have been ubiquitous in nature\, enablin
 g unique properties that are unachievable by monolithic\, homogeneous mate
 rials. Inspired by natural processes\, human-made three-dimensional (3D) a
 rchitected materials have been reported to enable novel mechanical propert
 ies such as high stiffness-to-density ratios or extreme resilience\, incre
 asingly so when nanoscale size effects are present. However\, most archite
 cted materials have relied on advanced additive manufacturing techniques t
 hat are not yet scalable and yield small sample sizes. Additionally\, most
  of these nano- and micro-architected materials have only been studied in 
 the static regime\, leaving the dynamic parameter space unexplored. \nIn t
 his talk\, we discuss advances in our understanding of architected materia
 ls by: (i) proposing numerical and theoretical tools that predict the beha
 vior of architected materials with non-ideal geometries\, (ii) presenting 
 a pathway for scalable fabrication of tunable nano-architected materials\,
  and (iii) exploring the response of nano- and micro-architected materials
  under three types of dynamic loading. We first explore the mechanics of l
 attice architectures with features at the micro- and millimeter scales\, a
 nd discuss the effect of nodes (i.e.\, junctions) to obtain more accurate 
 computational and theoretical predictive tools. Going beyond lattices\, we
  propose alternative node-less geometries that exhibit extreme mechanical 
 resilience\, and we harness self-assembly processes to demonstrate a pathw
 ay to fabricate one type in cubic-centimeter volumes while maintaining nan
 oscale features. Lastly\, we venture into the dynamic regime by designing\
 , fabricating\, and testing micro-architected materials that exhibit vibra
 tional band gaps in the MHz regime as well as nano-architected materials w
 ith extreme energy absorption upon microparticle supersonic impact. 
LOCATION:Zoom
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