Centers and Institutes   |
My main research interests are in geomechanics and the mechanics of granular materials. I focus specifically on computational methods for solving problems in these fields and am especially interested in the micro- to meso-scale modeling of crushing, fracture, and fluid-solid interaction in brittle materials (such as rock material) as well as the granular mechanics of cohesive powders and the effects of surface properties (e.g., morphology and spatially variant surface energy) on the macro-scale behavior of these materials.
Johnson, S.M., and J.R. Williams, “Sub-discretized surface model with applications to contact mechanics in multi-body simulation,” Accepted to Powder Technology, accepted (2008).
Morris, J.P., and S.M. Johnson, “Dynamic simulations of geologic materials using combined FEM/DEM/SPH analysis,” Geomechanics and Geoengineering, accepted (2008).
Johnson, S.M., and J.R. Williams, “On the application of quaternion-based approaches in discrete element methods,” Engineering Computations, accepted (2008).
Johnson, S.M., Williams, J.R., and B.K. Cook, “Quaternion-based rigid body rotation algorithm for use in particle methods,” International Journal of Numerical Methods in Engineering, 74, 1303-1313 (2008).
Johnson, S.M., Williams, J.R., and B.K. Cook, “Contact detection algorithm for an ellipsoid approximation for discrete element modeling,” Engineering Computations, 21, 2-5 (2004).