Weapons and Materials Research Directorate, Combustion, Kinetics, and Spectroscopy
||Aberdeen Proving Ground, MD 210055066
|Clayton, John Daniel
This work involves scientifically innovative research on modeling of the mechanical behavior of single crystalline and heterogeneous polycrystalline materials. Specific materials of interest include but are not limited to metals, ceramics, energetic materials, geological materials, or urban structural materials (e.g., concrete). Our primary concern is the behavior of such materials at small length scales, spanning from nanometers to millimeters (e.g., “mesoscale”) and at high strain rates. This research program seeks to advance the state-of-the-art in continuum physics, mathematical modeling, numerical methods, and scientific computing. Specifically, theoretical constitutive model development and numerical implementation in solid mechanics or multiphysics simulation codes of one or more of the following phenomena are sought: large deformations, nonlinear elasticity, plasticity, defects, fracture, and fragmentation. We are also interested in models capturing nonlocal effects and/or multiscale aspects. Continuum mechanics models are deemed of primary importance. However, multiscale techniques involving atomistic calculations, discrete defects, or phase field theories-indicating aspects of material behavior at increasingly fine length scales-are also relevant. The Associate will have access to ARL’s exceptional computing resources, including parallel supercomputers featuring thousands of processors, numerous commercial software for materials modeling (finite element, multiphysics, molecular mechanics, and scientific visualization), “in-house” research codes for advanced nonlinear materials modeling, and newly available three-dimensional microstructural rendering software.
Clayton JD: Nonlinear Mechanics of Crystals, Springer: Dordrecht, 2011
Clayton JD, Knap J: Physica D 240: 841, 2011
Continuum mechanics; Multiscale modeling; Mesoscale; Nanoscale; Plasticity; Elasticity; Fracture; Polycrystal; Finite elements;