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Advances in additive manufacturing will enable the fabrication of metamaterials with ever more complex architectures, to realize unusual and superior physical properties. The authors design and build lattices of sinusoidal beams, yielding a class of metamaterials with unusual, extreme mechanical behavior: Poisson's ratio for the system switches from negative to positive upon large deformation (the nonlinear regime). Potential applications include energy absorption, tunable acoustics, vibration control, responsive devices, soft robotics, and stretchable electronics.
Chen et al. (Thu,) studied this question.