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Geometry-driven Filamentary Structures Elastic Gridshells and Weaves 

Speaker

백창엽 박사, Postdoctoral Fellow, School of Engineering & Applied Mathematics, Harvard University

EDUCATION

  - Massachusetts Institute of Technology 2015 - 2020
    Ph.D. in Mechanical Engineering Cambridge, MA, USA
    Thesis: Geometry-driven lamentary structures: elastic gridshells, weaves, clasps, and knots
    Faculty Advisor: Pedro M. Reis, Professor of Mechanical Engineering, EPFL
  - Seoul National University 2009 - 2015
    B.S. in Mechanical Engineering Gwanak-gu, Seoul, S. Korea
    Graduated with highest honor

PROFESSIONAL EXPERIENCES

 - George F. Carrier Postdoctoral Fellow in Applied Mathematics 2020 - current
    School of Engineering and Applied Sciences, Harvard University Cambridge, MA, USA
    * Ongoing projects:
    -Evaluating knot invariants using graph neural network
     Collaborating with: Chris H. Rycroft, Associate Professor, Harvard University
    -Design of aperiodic lattices using graph neural network
     Collaborating with: Katia Bertoldi, Professor, Harvard University
    -Effect of plasticity on an entangled rod
     Collaborating with: Pedro M. Reis, Professor, EPFL, and Shawn Chester, Professor, NJIT 

| Date | Friday, September 17th, 2021

| Time | 11:00 ~ 

| Venue | 온라인 강의 (https://snu-ac-kr.zoom.us/j/6418345131 회의 ID: 641 834 5131)로 출석확인 해주세요. 

Abstract

First, we study the shape and the mechanical response of elastic gridshells, the three-dimensional structure of which results from the out-of-plane buckling of an initially flat and biaxial network of rods. A purely geometric continuum model, originally introduced by Chebyshev for woven fabric, is used to describe the underlying kinematics and form-finding. The results suggest that rod inextensibility, rather than elasticity, is the primary factor that determines the shape of elastic gridshells.

Second, we investigate triaxial weaving, a craft technique used to generate surfaces using tri-directional arrays of initially straight elastic ribbons. Traditional weavers intentionally introduce discrete topological defects, leading to unsmooth surfaces in the overall structure. As an alternative point of departure, we achieve smooth, three-dimensional weaved structures by prescribing in-plane curvatures to the flat ribbons. We demonstrate that a continuous range of integrated Gaussian curvatures can be achieved, which is not feasible using straight ribbons. The potential of this novel design scheme is demonstrated with a few canonical target shapes.

Reference:

(1) C. Baek, A. O. Sageman-Furnas, M.  K. Jawed, and P. M. Reis, “Form finding in elastic gridshells”, Proceedings of the National Academy of Sciences of the United States of America 115(1), 75-80 (2018).

(2) C. Baek, A. G. Martin, S. Poincloux, T. Chen, and P. M. Reis, “Smooth triaxial weaving with naturally curved ribbons”, Physical Review Letters 127, 104301 (2021)

| Host | Prof. In suk choi (02-877-2808)