112 citations · 669 across the 19 of their papers we have counts for
12 papers · 1 filter
Transient rolling friction model for discrete element simulations of sphere assemblies
Matthew R. Kuhn
The rolling resistance between a pair of contacting particles can be modeled with two mechanisms. The first mechanism, already widely addressed in the DEM literature, involves a co…
Investigation of cyclic liquefaction with discrete element simulations
Matthew R. Kuhn, Hannah E. Renken, Austin D. Mixsell +1
A discrete-element method (DEM) assembly of virtual particles is calibrated to approximate the behavior of a natural sand in undrained loading. The particles are octahedral, bumpy…
Implementation of the Jager contact model for discrete element simulations
Matthew R. Kuhn
In three-dimensional discrete element method (DEM) simulations, the particle motions within a granular assembly can produce bewildering sequences of movements at the contacts betwe…
Dense granular flow at the critical state: maximum entropy and topological disorder
Matthew R. Kuhn
After extensive quasi-static shearing, dense dry granular flows attain a steady-state condition of porosity and deviatoric stress, even as particles are continually rearranged. The…
Stress-induced anisotropy in granular materials: fabric, stiffness, and permeability
Matthew R. Kuhn, WaiChing Sun, Qi Wang
The loading of a granular material induces anisotropies of the particle arrangement (fabric) and of the material's strength, incremental stiffness, and permeability. Thirteen measu…
Maximum disorder model for dense steady-state flow of granular materials
Matthew R. Kuhn
A flow model is developed for dense shear-driven granular flow. As described in the geomechanics literature, a critical state condition is reached after sufficient shearing beyond…
Contact transience during slow loading of dense granular materials
Matthew R. Kuhn
The irregularity of particle motions during quasi-static deformation is investigated using discrete element (DEM) simulations of sphere and sphere-cluster assemblies. A total of th…
The critical state of granular media: Convergence, stationarity, and disorder
Matthew R. Kuhn
Discrete-element simulations are used to monitor several micro-scale characteristics within a granular material, demonstrating their convergence during loading toward the critical…
Stiffness pathologies in discrete granular systems: bifurcation, neutral equilibrium, and instability in the presence of kinematic constraints
Matthew R. Kuhn, Florent Prunier, Ali Daouadji
The paper develops the stiffness relationship between the movements and forces among a system of discrete interacting grains. The approach is similar to that used in structural ana…
Measurement of higher-order stress-strain effects in granular materials undergoing non-uniform deformation
Matthew R. Kuhn, Ching S. Chang
Discrete element (DEM) simulations demonstrate that granular materials are non-simple, meaning that the incremental stiffness of a granular assembly depends on the gradients of the…
Multi-directional behavior of granular materials and its relation to incremental elasto-plasticity
Matthew R. Kuhn, Ali Daouadji
The complex incremental behavior of granular materials is explored with multi-directional loading probes. An advanced discrete element model (DEM) was used to examine the reversibl…
Quasi-static incremental behavior of granular materials: elastic-plastic coupling and micro-scale dissipation
Matthew R. Kuhn, Ali Daouadji
The paper addresses a common assumption of elastoplastic modeling: that the recoverable, elastic strain increment is unaffected by alterations of the elastic moduli that accompany…