Dynamic plastic localization and fragmentation of porous printed metals: impact experiments and multiscale modeling
Understanding damage, localization, and fracture in ductile solids and structures subjected to high-velocity impacts or blast loadings is crucial in the aerospace industry, military applications, civil engineering, and geophysical studies. Examples include the impact on protection systems for armored vehicles, the explosive behavior of projectiles, and the impact of orbital debris on spacecraft structures. These situations require preserving the integrity of structures subjected to strain rates within the range of >103 s-1. Since the late 18th century, there has been an intense debate on the causes behind dynamic plastic localization and fragmentation of ductile solids. This lecture provides an overview of the experimental and modeling efforts developed in recent years within our group to identify the mechanisms controlling dynamic localization and fracture of additive-manufactured porous metallic materials. The methods include: (i) pre- and post-mortem characterization of the porous microstructure of printed metals using SEM analysis and X-ray tomography, (ii) in-situ synchrotron X-ray phase contrast imaging of plate-impact, shear fracture and fragmentation experiments, and (iii) microstructurally informed finite element modeling of dynamic tests incorporating the porous and/or crystallographic microstructure of the printed materials. The drawbacks and limitations of the methodology, the bottlenecks in research implementation, and the difficulties of achieving consistent quantitative agreement between experiments and modeling will also be discussed.
José A. Rodríguez-Martínez is an Associate Professor in the Department of Continuum Mechanics and Structural Analysis at the University Carlos III of Madrid, and the head of the research group Nonlinear Solid Mechanics. Dr. Rodríguez-Martínez holds a PhD in Mechanical Engineering from the University Carlos III of Madrid and a PhD in Mechanics of Materials from the University Paul Verlaine of Metz. His research on the flow and fracture behavior of ductile materials under high strain rates has received funding totaling several million euros from various national and international agencies, including the European Research Council. Dr. Rodríguez-Martínez has published over 80 peer-reviewed papers in international journals and has delivered numerous invited lectures and seminars at international conferences, universities, and research centers. He currently serves as the Associate Editor of the Journal of Engineering Materials and Technology and is a member of the Editorial Advisory Board of the International Journal of Plasticity. Dr. Rodríguez-Martínez is the secretary of the Spanish Society of Applied and Theoretical Mechanics and a member of the Advisory Board of EUROMECH.