Showing papers by "Jacob D. Hochhalter published in 2009"
TL;DR: DDSim as mentioned in this paper is a next-generation damage and durability simulator with a hierarchical, multiscale, "search and simulate" strategy, which consists of three levels: initial, reduced order, conservative screening, based on a linear finite element analysis of the uncracked component, to determine the most life-limiting locations for intrinsic material flaws.
28 citations
12 Jul 2009
TL;DR: In this paper, a multiscale modeling method, based on the aggregation of fundamental damage processes occurring at the nanoscale within a cohesive zone model, is proposed to enable computationally feasible and physically meaningful microscale fracture simulation in polycrystalline metals.
Abstract: Fracture processes within a material begin at the nanometer length scale at which the formation, propagation, and interaction of fundamental damage mechanisms occur Physics-based modeling of these atomic processes quickly becomes computationally intractable as the system size increases Thus, a multiscale modeling method, based on the aggregation of fundamental damage processes occurring at the nanoscale within a cohesive zone model, is under development and will enable computationally feasible and physically meaningful microscale fracture simulation in polycrystalline metals This method employs atomistic simulation to provide an optimization loop with an initial prediction of a cohesive zone model (CZM) This initial CZM is then applied at the crack front region within a finite element model The optimization procedure iterates upon the CZM until the finite element model acceptably reproduces the near-crack-front displacement fields obtained from experimental observation With this approach, a comparison can be made between the original CZM predicted by atomistic simulation and the converged CZM that is based on experimental observation Comparison of the two CZMs gives insight into how atomistic simulation scales
1 citations