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X-LIC-LOCATION:Asia/Hong_Kong
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DTSTART:19911015T033000
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BEGIN:VEVENT
DTSTAMP:20251218T030657Z
LOCATION:Meeting Room S221\, Level 2
DTSTART;TZID=Asia/Hong_Kong:20251216T145000
DTEND;TZID=Asia/Hong_Kong:20251216T150000
UID:siggraphasia_SIGGRAPH Asia 2025_sess127_papers_2018@linklings.com
SUMMARY:Numerical Homogenization of Sand from Grain-level Simulations
DESCRIPTION:Yi-Lu Chen (ISTA (Institute of Science and Technology Austria)
 ) and Mickaël Ly and Chris Wojtan (ISTA (Institute of Science and T)\n\nTh
 e realistic simulation of sand, soil, powders, rubble piles, and large col
 lections of rigid bodies is a common and important problem in the fields o
 f computer graphics, computational physics, and engineering. Direct simula
 tion these individual bodies quickly becomes expensive, so we often approx
 imate the entire group as a continuous material that can be more easily co
 mputed using tools for solving partial differential equations, like the ma
 terial point method (MPM). In this paper, we present a method for automati
 cally extracting continuum material properties from a collection of rigid 
 bodies. We use numerical homogenization with periodic boundary conditions 
 to simulate an effectively infinite number of rigid bodies in contact. We 
 then record the effective stress-strain relationships from these simulatio
 ns and convert them into elastic properties and yield criteria for the con
 tinuum simulations.\n\nOur experiments validate existing theoretical model
 s like the Mohr-Coulomb yield surface by extracting material behaviors fro
 m a collection of spheres in contact. We further generalize these existing
  models to more exotic materials derived from diverse and non-convex shape
 s. We observe complicated jamming behaviors from non-convex grains, and we
  introduce a new material model for materials with extremely high levels o
 f internal friction and cohesion. We simulate these new continuum models u
 sing MPM with an improved return mapping technique. The end result is a co
 mplete system for turning an input rigid body simulation into an efficient
  continuum simulation with the same effective mechanical properties.\n\nRe
 gistration Category: Full Access, Full Access Supporter\n\nSession Chair: 
 Tuur Stuyck (Meta)\n\n
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