Sviluppi dell'ingegnerizzazione del metamateriale pantografico: modelli, fabbricazione, esperimenti e caratterizzazione meccanica

In the last decade, investigating the exotic properties of microstructured materials has gathered increasing attention and contributions. Among various fascinating typologies of engineered materials, the class of pantographic metamaterials has demonstrated theoretical and mechanical peculiarities. Their development is a dense fusion of theoretical knowledge of the most advanced theories in continuum mechanics and their application through modern manufacturing and measuring techniques. The present work aims to present some of the modeling solutions of such novel materials and how a full understanding of their theoretical framework can realize physical structures with unconventional and specifically designed mechanical behavior. Additionally, the work provides some experimental evidence in the field of pantographic metamaterials, focusing on significant results of 2D specimens of pantographic metamaterial printed using metallic powder and preliminary analysis on the pantographic microstructure’s elementary module. Lastly, a constitutive parameters identification of a discrete model for a millimetric pantographic unit cell is attempted and achieved. With novel measurement techniques such as Digital Image Correlation, it was possible to obtain a complete characterization of a Hencky-type discrete pantograph model, which is closely linked to continuous models widely treated in the recent bibliography.