Disordered network mechanical metamaterials (DNMMs) are a class of me- chanical materials characterized by a macroscopic network architecture of random arrangements of bonds connected at junction points. Using a com- putational approach called pruning that optimizes the bulk and shear mod- ulus via selective bond removal, it was shown that the elastic properties of these DNMMs can be tuned to arbitrary values. In this contribution, we present experimental results on the deformation behavior of 3D-printed 2D and 3D DNMMs. We conduct dynamic impact studies on the 3D DNMMs to show how pruning of the network architecture can significantly alter the stress wave transfer efficiency of these materials that is independent of the constituent print materials. For the 2D DNMMs, we perform quasi-static tensile testing to fracture these materials to study the role of network ar- chitecture in controlling crack propagation. The results from these fracture studies provide insights into the relationship between fracture toughness and Poisson’s ratio in disordered materials.

Mechanical behavior of 2D and 3D disordered network mechanical materials

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.