|About this Abstract
||NUMIFORM 2019: The 13th International Conference on Numerical Methods in Industrial Forming Processes
||S-01: Modeling of the Anisotropic Behavior in Plasticity
||Numerical Integration of Isotropic and Anisotropic Plasticity Models
||William Scherzinger, Brian Lester, Jakob Ostien
|On-Site Speaker (Planned)
Recent work on the integration of plasticity models using a line search algorithm has enabled many high-fidelity models to be reliably implemented in production computing codes. A Newton algorithm augmented with a line search method provides a reliable and robust technique for integrating plasticity models using a closest point projection algorithm. This work explores the performance of the algorithm with specific application to a modular modeling framework developed at Sandia National Laboratories that allows for an assortment of yield surfaces and hardening laws with rate and temperature dependence. The return mapping algorithm is examined in detail, with examples highlighting various features of the line search algorithm. Importantly, special attention is paid to the enabling features of the proposed scheme and its improvements versus traditional approaches. The anisotropic plasticity models of Barlat and co-workers are used to investigate the line search methods and results are presented that show significant improvement in the convergence of the return mapping algorithms for both isotropic and anisotropic behavior. Larger boundary value problems are also employed which show the effectiveness, and necessity, of the line search algorithm in attaining results when implemented in a solid mechanics finite element code.
Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia LLC, a wholly owned subsidiary of Honeywell International Inc. for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.