Daniel Rittel

STATIC AND DYNAMIC FRACTURE MECHANICS OF PRINTED ALUMINUM LATTICES

Abstract:

With the advent of metal printing technologies, the creation of lattices which was extremely arduous until now, has become much easier, allowing for a variety of parameters such as lattice unit cell, struts thickness among others.
While the mechanical response of lattices, under both static and dynamic conditions, has been and still is extensively studied mostly for energy absorption purposes, the fracture mechanics of the said lattices have been widely overlooked.
Experiments were carried out for two notched lattice geometries (diamond and diagonal) that were tested under quasi-static and dynamic (impact) loading using one-point impact experiments. This type of loading allows not only mode I but also mode II testing of the notched specimens.
The salient characteristics of the fracture process will be reported, together with a systematic comparison between static and dynamic failure modes. In addition, the combined use of our ultra-high speed and thermal cameras will be shown to complement the visual information by thermal measurements that are characteristic of the failure process.

Biography:

Prof. Daniel Rittel holds the Zandman Chair in Experimental Mechanics and heads the Materials Mechanics Center at Technion. D. Rittel was the Clark B. Millikan Visiting Professor in Aeronautics (2007) at Caltech where he holds a Visiting Associate position. He is the incumbent of a Catedra de Excellencia at UC3M (Madrid) in 2012 and 2019, where he is now an Honorary Professor. Throughout the years, D. Rittel has developed expertise in many aspects of dynamic failure, including fracture mechanics, constitutive behavior, dynamic failure mechanisms, numerical modeling, and more recently dental biomechanics and soft matter. D. Rittel’s interest is in the thermomechanics and physics of dynamic failure, specifically dynamic fragmentation, fracture, adiabatic shear banding, and hysteretic heating. In 2015, D. Rittel was awarded the prestigious Gili Agostinelli Prize (Torino Academy of Sciences, Italy) for his work on adiabatic shear localization, and in 2018, he was awarded the BJ. Lazan award from the SEM.