2025-04-09 09:00:00
The Dual-Domain Material Point Method (DDMP), introduced by Zhang in 2011, was designed to resolve the cell-crossing instability in the Material Point Method (MPM). DDMP calculates internal nodal forces using a continuous modified gradient of the shape function, preventing sign changes in nodal forces…
We develop a bonded particle model (BPM) to study dynamic impact and shock propagation in mechanically heterogeneous dissipative solids. We calibrate the BPM model interactions to realize isotropic solids with tunable nonlinear elasticity and linear dissipation. We simulate compressive impact and predict the development,…
Recent investigations of data-driven constitutive homogenization highlight, as a critical outcome, that compact numerical representations of (in)elastic models promote computational tractability required for applications like nonlinear dynamics – i.e., by reducing operations required per finite element integration point to a practicable minimum. Moreover, compactness…
Polymer Bonded Explosives (PBXs) are typically comprised of a crystalline energetic suspended in a polymeric binder. These materials exhibit complex heterogeneous deformation which makes accurate quantification and simulation of the thermo-mechanical response extremely challenging. To capture the multiscale behavior of these materials, we employ…
We establish a computational framework to explore the atomic configuration of a metal-hydrogen (M-H) system when in equilibrium with a H environment. This approach combines Diffusive Molecular Dynamics with an iteration strategy, aiming to minimize the system’s free energy and ensure uniform chemical potential…
Material point method (MPM) uses Eulerian mesh and Lagrangian particles. The original MPM can be easily used in unstructured mesh as the finite element method. Because of the discontinuity of the gradients of the shape functions across cell boundaries, as particles move across them,…
Based on our recent studies [1-4], team efforts are being made to engineer hierarchical lattice structural responses to impact loading via multiscale modeling and evaluation. In the conference, a comparative study will be presented with the use of molecular dynamics (MD) and material point…
Previous studies have demonstrated that large collective particle rearrangements occur during plastic deformation of amorphous solids, where the displacement fields can resemble Eshelby quadrupoles in continuum elastic materials during deformation. However, numerous collective particle displacement fields associated with plastic events in amorphous solids do…
