Nathan Barton¹; ¹Lawrence Livermore National Laboratory

We present results from an investigation of microstructural effects on failure of ductile metals. The computational model makes use of a crystal mechanics based constitutive model that includes porosity evolution. The formulation includes nucleation behavior, enhancing capabilities for modeling small length scales at which nucleation site potency and volume fraction are more variable. Anisotropic crystal response and interactions among the crystals produces heterogeneities that influence spall response and spatial resolution of the polycrystal allows for investigation of various types of nucleation site distributions. By focusing validation efforts on models that connect to experimentally measurable microstructural features, we can then build confidence in use of the models for components prepared under different processing routes, with different chemical compositions and attendant impurity distributions, or subjected to different loading conditions. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344 (LLNL-ABS-664056).