Title: Modeling Polycrystalline Mechanics via The eXtended Finite Element Method Speaker: Jessica Sanders, NECIS Student, Duke UniversityDate/Time: Tuesday, August 15, 2006, 2:00 – 3:00 pm Location: Building 899, Room 1811 (Sandia NM) Brief Abstract: There are many special challenges associated with the finite element modeling of polycrystalline structures at small length scales. For example, at the micro level material behavior is modified relative to the macro scale response by the presence of discrete crystalline grains and their interfaces. Hence, assumptions about bulk material behavior may no longer be appropriate. In simulations where modeling at the micro-scale is of interest (e.g. micro-machining applications) capturing this behavior by explicit meshing of grain boundary interfaces can be inefficient and impractical. The eXtended Finite Element Method (X-FEM; Moes, Dolbow, Belytschko et. al.) and the Generalized Finite Element Method (GFEM; Duarte et al) provide a variational framework to represent boundaries and interfaces without fitting a conforming mesh. Instead, internal features are represented with discontinuous enrichment of the standard finite element basis. An extension of the method by Duarte et. al., specifically applies these ideas to the problem of polycrystalline materials. In this talk, an implementation of the generalized finite element method will be demonstrated, specifically designed to capture polycrystalline grain behavior independent of the background mesh. New techniques for treating inter-granular physics in the context of GFEM/X-FEM will also be discussed.CSRI POC: Tom Voth (505) 844-6004 and Josh Robbins (505) 284-5653 |