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Ebook ASCI alliance center for simulation of dynamic response in materials FY 2000 annual report: Part 2

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(BQ) Part 2 book "ASCI alliance center for simulation of dynamic response in materials FY 2000 annual report" has contents: Solid dynamics, materials properties, compressible turbulence, computational science. | Chapter 4 Solid Dynamics 4.1 Overview of FY 00 Accomplishments Accomplishments during FY 00 include the serial implementation of adaptive mesh re£nement (subdivision) and coarsening (edge collapse); and the fully parallel implementation of the solid dynamics engine within the VTF3D (without mesh adaption). As in previous years, we have structured our material modeling efforts in terms of lengthscale. At the nanoscale we have continued to carry out quasicontinuum simulations of nanoindentation in gold; and mixed continuum/atomistic studies of anisotropic dislocation line energies and vacancy diffusivities in stressed lattices. At the microscale we have developed a phase £eld model of crystallographic slip and the forest hardening mechanism; we have re£ned our mesoscopic model of Ta by investigating the strengths of jogs resulting from dislocation intersections, the dynamics of dislocationpair annihilation, and by importing a variety of fundamental constants computed the MP group. At the macroscale we have focused on various enhancements of our engineering material models including the implementation and veri£cation of a Lagrangian arti£cial viscosity scheme for shock capturing in the presence of £nite deformations and strength; the implementation of an equation of state and elastic moduli for Ta computed from £rst principles by Ron Cohen (MP group); and the implementation of the Steinberg-Guinan model for the pressure dependence of strength. 4.2 Personnel • Faculty: – Thomas J. Ahrens – Alberto Cuiti˜ o (Rutgers University) n – Michael Ortiz – Robert Phillips 48 CHAPTER 4. SOLID DYNAMICS 49 – Deborah Sulsky (University of New Mexico) – Pierre Suquet (University of Marseille) • Research fellows: – Jarek Knap – Raul Radovitzky • Post-doctoral fellows: – Sylvie Aubry – David Olmsted (Brown University) • Graduate students: – Matt Fago – Marisol Koslowski – Adrian Lew – Jean-Francois Molinari 4.3 Nanomechanics Nanoindentation provides an effective .