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. 2018 Jan 19;4(1):eaao7005. doi: 10.1126/sciadv.aao7005

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 4 — Two mechanisms capable of producing auxetic behavior are discovered from our microstructure families. (A) The slanted column transforms vertical stress into horizontal displacement. (B) The rotating triangle mechanism pulls the outer tip of the joint toward the center of the structure, reducing the macroscopic volume. (C) Relationship between vertical strain and rotation of the triangle joint. (D) The rotation is observed in printed samples under vertical load. (E) Stress is concentrated at the lower end of the triangle joint.