| Thu April 6th 2023 10:00 – 11:00 CR3H | Seminar | Particulate modeling of slender elastic structures undergoing large deformations for dynamic particle-structure interaction studies in the DEM framework Gondi Kondaiah Ananthasuresh |
Details:The mechanical behaviour of deformable bodies in a particulate environment has been an area of increasing interest across a wide spectrum of systems and scale. A composite ensemble of deformable structures and discrete particles involves coupling of component responses, large displacements of structures, and multiple dynamic interactions. To describe these structures and their interactions with particles, we apply a particle simulation approach based on the discrete element method (DEM). Beginning with a discussion of mechanical behaviour of particulate models of slender elastic continua and validating them with their analytical or finite element results, particle-structure interactions are considered next. We develop elastically deformable particulate models of straight beams and shallow arches. We evaluate the geometrically nonlinear response of particulate beams under a variety of static, dynamic, and impact loading scenarios. We also model particulate arches and assess their ability to exhibit two force-free equilibrium states, namely bistability. To illustrate the utility of these particulate representations, we first consider a case study of an undulating beam in a particle medium, simulating the motion of sandfish. In another case study, we take up a relatively sparse environment of mobile particles and oscillating cantilever beams. We also demonstrate particle-arch interactions in bistable mechanisms that result in particle gripping and trapping. Finally, we present particulate thin films that undergo deflections in linear and geometrically nonlinear regimes and describe both plate-like and membrane-like behaviours. A notable instance of this particulate perspective of thin films occurs in the context of microscopic biological material such as cells and their organelle. | ||
