Séminaire de Renaud Rinaldi

Titre :  Crushing performance of polymeric pyramidal lattices and hierarchical Lattice/Foam Composites

Résumé : The emergence of novel processing techniques allows for the design of cellular materials with a greater control of the architecture compared to the conventional stochastic foams. Among them is an inexpensive scalable processing technique leading to 3D network of interconnecting truss structures formed from self-propagated polymer waveguides.

The present work focuses on the comprehensive study of the crushing performance of the so called single and double-layer systems. Furthermore, we present and assess a polymeric hierarchical composite concept that aims to combine the desirable attributes of stochastic foams and lattice structures: while stochastic foams are soft but absorb energy efficiently under compressive loading, in contrast, periodic lattice structures are strong but generally exhibit poor energy-absorption characteristics. Thus, the designed composite comprises a low-density polymer lattice structure and a fine-scale stochastic foam in the spaces between the lattice struts to combine high strength and enhanced energy absorption capability.
As for complex architecture, pros (a wide range of lattice geometry can be tailored) and cons (geometrical and material heterogeneities) resulting from the periodic lattice processing technique will be highlighted throughout the presentation.

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Renaud Rinaldi est chercheur à l'université de Californie, département matériaux