Drucker-prager elastoplasticity for sand animation
Abstract
We simulate sand dynamics using an elastoplastic, continuum assumption. We demonstrate that the Drucker-Prager plastic flow model combined with a Hencky-strain-based hyperelasticity accurately recreates a wide range of visual sand phenomena with moderate computational expense. We use the Material Point Method (MPM) to discretize the governing equations for its natural treatment of contact, topological change and history dependent constitutive relations. The Drucker-Prager model naturally represents the frictional relation between shear and normal stresses through a yield stress criterion. We develop a stress projection algorithm used for enforcing this condition with a non-associative flow rule that works naturally with both implicit and explicit time integration. We demonstrate the efficacy of our approach on examples undergoing large deformation, collisions and topological changes necessary for producing modern visual effects.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 11, 2016
- Source ID
- 10.1145/2897824.2925906
Entities
People
- Andre Pradhana
- Chenfanfu Jiang
- Chuyuan Fu
- Craig Schroeder
- Gergely Klár
- Joseph Teran
- Theodore Gast
Organizations
- National Science Foundation
- Office of Naval Research
- United States Department of Defense
- University of California, Los Angeles