Micromechanical Simulation of Fracture Behavior of Nanostructured Metals with Bimodal Grain Size Distribution

• DOI: 10.1016/j.mspro.2014.06.348
• Publication Date: 2014-06-27T05:18:35Z
• Authors: X. Guo; R. Ji; G.J. Weng; L.L. Zhu; J. Lu
• Keywords: Toughening; Ductility (Earth science)

Nanostructured metals with bimodal grain size distribution, composed of coarse grains (CG) and nanograins regions, can have high strength good ductility. Here, numerical simulations, based on the mechanism-based strain gradient plasticity, micromechanical composite model Johnson-Cook failure model, investigate effects distribution characteristics shape CG regions fracture behavior nanostructured metals. Simulations show that both them directly influence load response, energy dissipation pattern. This study shows region bridging crack deflection are main toughening mechanisms