concurrent multiscale computational modeling for dense dry granular materials interfacing deformable solid bodies推荐.pdf

Concurrent Multiscale Computational Modeling for Dense Dry Granular Materials Interfacing Deformable Solid Bodies Richard A. Regueiro and Beichuan Yan University of Colorado at Boulder, Boulder, CO, USA e-mail: regueiro@, beichuan.yan@ Abstract. A method for concurrent multiscale computational modeling of interfa- cial mechanics between granular materials and deformable solid bodies is presented. It involves two main features: (1) coupling discrete element and higher order con- tinuum finite element regions via an overlapping region; and (2) implementation of a finite strain micromorphic pressure sensitive plasticity model as the higher order continuum model in the overlap region. The third main feature, adaptivity, is not currently addressed, but is considered for future work. Single phase (solid grains) and dense conditions are limitations of the current modeling. Extensions to multiple phases (solid grains, pore liquid and gas) are part of future work. Applications in- clude fundamental grain-scale modeling of interfacial mechanics between granular soil and tire, tool, or penetrometer, while properly representing far field boundary conditions for quasi-static and dynamic simulation. 1 Introduction Granular materials are commonly found in nature and industrial processes, and are composites of three phases: solids, liquids, and gases. We limit the modeling currently to single phase (solid grains) and dense materials (average coordination number ≈ 5). Examples include metallic powders (for powder metallurgy), phar- maceutical pills, agricultural grains (in silo flows), dry soils (sand, silt, gravel), and lunar and martian regolith (soil found on the surface of the Moon and Mars), for in- stance. We are interested primarily in modeling the grain to macro-continuum scale response in the large shear deformation interface region between a granular mate- rial and deformable solid body. Such interface can be between a granular soil (e