Multi-Scale Characterization and Modeling of Ductile Failure in Cast Aluminum Alloys

Abstract

This paper develops three components contributing to the framework of multi-scale modeling of ductile fracture in aluminum alloys. The first module is morphology-based domain partitioning, which delineates regions of statistical inhomogeneity. The second module is micromechanical analysis with particle fragmentation and matrix cracking. A locally enriched VCFEM or LE-VCFEM is developed to incorporate ductile failure through matrix cracking in the form of void growth and coalescence using a non-local Gurson-Tvergaard-Needleman model. The third module develops a homogenized anisotropic plasticity-damage model for macroscopic analysis. Parameters in this GTN model are calibrated from results of homogenization of microstructural variables of microstructural RVE.

Keywords:

• Multiscale Domain Partitioning
• Voronoi Cell FEM
• Ductile Failure
• Anisotropic GTN Model
• Multi-Scale Modeling

Acknowledgments

This work has been supported by the National Science Foundation NSF Div Civil and Mechanical Systems Division through the GOALI grant No. CMS-0308666 (Program director: C. Cooper) and by the Department of Energy Aluminum Visions program through grant No. A5997 (sub contract from Univ. of Illinois). This sponsorship is gratefully acknowledged. Computer support by the Ohio Supercomputer Center through grant PAS813-2 is also gratefully acknowledged.