Seminar Schedule – Fall 2021
Thursday, November 18, 2021
Time: 3:30pm – 4:30pm
This seminar will be held virtually via Zoom in email announcement
Mechanics of architected materials: from lightweight lattice structures to DNA origami
Dr. Stravros Gaitanaros
Department of Civil and Systems Engineering
Johns Hopkins University
One of the most promising recent developments in materials science and engineering is the concept of exploiting “architecture” ─ the combination of topology and solid(s) distribution ─ as a means to generate materials with properties that are unattainable by traditional monolithic solids. Architected materials, such as additively manufactured lattices and foams, multiphase composites, and nanostructured materials, are excellent candidates for a plethora of engineering applications ranging from space structures to nano-biomedical devices. The first part of this talk focuses on the fracture mechanics of lightweight lattice materials made of a brittle parent solid. In contrast to traditional fracture mechanics of monolithic solids, where the stress and displacement fields are described by the stress intensity factors, defining the corresponding fields in truss-based materials remains an open challenge. We present here an energy-based technique that combines experiments, modelling, and theory, in order to define and predict the fracture properties of these complex material systems. The second part of the talk will focus on how we can exploit data-driven techniques for microstructure quantification and structure-property correlation for both regular and irregular cellular solids. Results will be shown for 2D tessellation-based topologies and the way that key morphological characteristics contribute to the apparent macroscopic stiffness. Finally, we will discuss the mechanical properties of a new class of materials that uses synthetic DNA strands as a building block for bottom-up manufacturing with nanoscale precision.
For further information, please contact Dr. Stelios Kyriakides at skk@utexas.edu or (512) 471-4167.
