Title: Multiscale modeling of ductile failure and spall

Speaker: Celia Reina Romo, Aeronautics Dept., Computational Solid Mechanics Group, Caltech

Date/Time: Thursday 4/8/2010, 9:30 AM        

Location: CSRI Building/Room 90 (Sandia NM)

Brief Abstract: Computational models of material failure that reproduce the underlying physics are required in order to be predictive. This talk will present nucleation, growth and coalescence models for the simulation of ductile rupture. Lattice diffusion of vacancies in high purity single crystals is examined with kinetic Monte Carlo techniques as a mechanism of nucleation of nanovoids that can further grow by plasticity. The necessary parameters for the simulation are taken from first principle calculations giving the model a multiscale character. Once the voids have been nucleated, their growth is studied through a representative volume of a hollow sphere. A specialized finite element model based on spherical harmonics has been developed for this purpose. Current and future work will also be discussed including potential applications in different fields.

CSRI POC: Stewart Silling, (505) 844-3973 and John Aidun, (505) 844-1209