Mechanical metameterials are architectured materials that possess unusual mechanical properties with potential applications ranging from impact mitigation to robotics. One example of such a material was recently demonstrated in disordered macroscopic networks consisting of nodes connected by springs. By systematic bond removal, i.e. pruning, it was experimentally shown that the Poisson’s ratio of these auxetic disordered networks can be tuned to arbitrary values. In this contribution, we study the high rate impact behavior of these auxetic disordered networks. Unpruned and pruned auxetic disordered networks are fabricated via 3D printing to generate materials with a range of mechanical properties. Linear impact studies at velocities ranging from 0.1 m/s to 1.5 m/s, coupled with high speed imaging, are used to quantify and demonstrate the change in Poisson's ratio and specific energy absorption as a function of extrinsic and intrinsic materials property changes of these networks.

High-rate deformation of auxetic disordered networks

2019 Spring National Meeting

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