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SUMMARY:Virtual MEchanics GAthering -MEGA- Seminar: Talk 1 - Computational
  assembly for fabrication\; Talk 2 - Deploying BASS - bistable auxetic sur
 face structures
DTSTART:20210415T161500
DTEND:20210415T173000
DTSTAMP:20260511T163221Z
UID:0e13bb9ad84d7ed4e4880eb43bf5b4493da60bedc53e89d91d35f98d
CATEGORIES:Conferences - Seminars
DESCRIPTION:Ziqi Wang & Tim Chen (GCM\, EPFL)\nTalk 1: Computational ass
 embly for fabrication\, by Ziqi Wang (GCM\, EPFL)\n\nAbstract An assemb
 ly refers to a collection of parts joined together to achieve a specific f
 orm and/or functionality. Conventionally\, parts in an assembly are joined
  by glue\, nails\, screws\, or some standard connectors. However\, these j
 oining methods do not encourage disassembly and re-assembly. My research f
 ocuses on using integral joints\, which are a portion of the parts' geomet
 ry\, to make assemblies that can transmit force to carry loads.  Designin
 g these assemblies is a non-trivial task as a slight local modification on
  a part’s geometry or its joining method could have a global impact on t
 he structural performance of the whole assembly. In this talk\, I will pre
 sent a general computational framework for modeling and optimizing assembl
 ies with integral joints to achieve various structural stability. The pote
 ntial applications include toy puzzles\, furniture\, and architecture.\n\n
 Bio Ziqi Wang is a Ph.D. candidate at the School of Computer and Communic
 ation Sciences at EPFL. He received his bachelor degree in Mathematics in 
 2017 from University of Science and Technology of China. His research inte
 rests focus on geometry processing\, architecture geometry\, and digital f
 abrication.\n\nTalk 2: Deploying BASS - bistable auxetic surface structure
 s\, by Tim Chen (GCM\, EPFL)\n\nAbstract We present Bistable Auxetic Su
 rface Structures (BASS) a novel deployable material system based on optimi
 zed bistable auxetic cells. A BASS can be flat-fabricated from elastic she
 et material\, then deployed towards a desired double-curved target shape b
 y activating the bistable mechanism of its component cells. A unique featu
 re of BASS is that the deployed model is by design in a stable state. This
  facilitates deployment without the need of complex external supports or b
 oundary constraints.\n\nWe introduce a computational solution for the inve
 rse design of BASS. Our algorithm first pre-computes a library of bistable
  auxetic cells to cover a range of in-plane expansion/contraction ratios\,
  while maximizing the bistability and stiffness of the cell to ensure robu
 st deployment. We then use metric distortion analysis of the target surfac
 e to compute the planar fabrication state as a composition of cells that b
 est matches the desired deployment deformation. As each cell expands or co
 ntracts during deployment\, metric frustration forces the surface towards 
 its target equilibrium state. We validate our method with several physical
  prototypes.\n\nBio Tian (Tim) Chen is currently a post-doctoral scientis
 t at the EPFL. He is co-advised by Pedro Reis from mechanical engineering 
 and Mark Pauly from computer science. His research is at the intersection 
 of computational design\, material science\, solid mechanics and advanced 
 manufacturing. He received his PhD in mechanical engineering from ETH Zuri
 ch\, as well as the ETH Medal for outstanding doctoral theses. He plans to
  begin a faculty position this coming fall.\n\n 
LOCATION:https://epfl.zoom.us/s/84678428267 Passcode: 174387 https://epfl.
 zoom.us/s/84678428267
STATUS:CONFIRMED
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