Three-Dimensional Printing of Elastomeric, Cellular Architectures with Negative Stiffness (pages 4905–4913)
Eric B. Duoss, Todd H. Weisgraber, Keith Hearon, Cheng Zhu, Ward Small IV, Thomas R. Metz, John J. Vericella, Holly D. Barth, Joshua D. Kuntz, Robert S. Maxwell, Christopher M. Spadaccini and Thomas S. Wilson
Article first published online: 2 MAY 2014 | DOI: 10.1002/adfm.201400451
Three-dimensional printing of viscoelastic inks to create porous, elastomeric architectures with mechanical properties governed by the ordered arrangement of their sub-millimeter struts, is reported. Two layouts are patterned, one resembling a “simple cubic”-like structure and another akin to a “face-centered tetragonal” configuration. These mechanical metamaterials exhibit markedly distinct load response with directionally dependent behavior, including negative shear stiffness.