Walker is Director of the Engineering Dynamics Department of SwRI, where he oversees and manages a multi-disciplinary effort to investigate the dynamic response of materials and structures. His research is in wave propagation, plasticity, penetration mechanics, blast loading, and the dynamic response, fracture and failure of materials. Typically his work includes and combines large scale numerical simulations finite element, finite volume, spectral , analytical techniques, and experiments. He is a developer of the Walker-Anderson penetration model.
Carbon nanotubes CNTs are possible nanoinjectors for the introduction of therapeutic agents into cells. To explore their interactions with a lipid bilayer membrane and to model the nanoinjection process, we used coarse-grained molecular dynamics to simulate the penetration of dipalmitoylphosphatidylcholine DPPC bilayers by single-walled CNTs. Lipids are extracted from a bilayer during CNT penetration and reside on both the inner and the outer tube surfaces. However, the degree of lipid lining of the inner surface is strongly dependent upon the tube penetration velocity, with fewer lipids extracted from the bilayer at higher rates.
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Theoretical foundation for large-scale computations for nonlinear material behavior pp Cite as. This paper provides an overview of the calculation of penetration. Particular emphasis is placed on numerical simulation of penetration. The predictive capability of current wave propagation codes for impact problems as well as requirements for improving their predictive capability are discussed. Unable to display preview.