Report

Three-dimensional mechanical metamaterials with a twist

See allHide authors and affiliations

Science  24 Nov 2017:
Vol. 358, Issue 6366, pp. 1072-1074
DOI: 10.1126/science.aao4640

eLetters is an online forum for ongoing peer review. Submission of eLetters are open to all. eLetters are not edited, proofread, or indexed.  Please read our Terms of Service before submitting your own eLetter.

Compose eLetter

Plain text

  • Plain text
    No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.
Author Information
First or given name, e.g. 'Peter'.
Your last, or family, name, e.g. 'MacMoody'.
Your email address, e.g. higgs-boson@gmail.com
Your role and/or occupation, e.g. 'Orthopedic Surgeon'.
Your organization or institution (if applicable), e.g. 'Royal Free Hospital'.
Statement of Competing Interests
CAPTCHA

This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.

Image CAPTCHA
Enter the characters shown in the image.

Vertical Tabs

  • More Metamaterials, More Imaginations
    • Keita Taniguchi, Supervisor, Virtual Design and Construction Company
    • Other Contributors:
      • Yoshiyasu Takefuji, Professor, Keio University

    Frenzel et al. have showed three dimensional chiral mechanical metamaterials with twist degrees beyond Cauchy elasticity (1). Torsional resonance experiments have previously been reported and similar effect was already presented in wet human compact bones by R.S.Lakes in 1982 (2). Frenzel and the researchers imagine controlling Rayleigh-like waves as one of the applications of the research by steering force fields or mechanical waves around obstacles (1,3).
    “Miyadaiku,” Japanese traditional professional carpenters who built huge temples and castles, have implemented human bone structures including patella and muscle to be an ideal buffer structure for threats including earthquakes and strong winds (4). The joints of the human bone body perform the ultimate functionality and artistry. Japan has been struck by magnitude 7.0 or greater earthquakes with 46 times in the last 1400 years. Horyuji temple built in 607AD without a single nail ( the oldest wooden building in the world) survives such giant earthquakes. The temple uses twisted trees where a combination of left and right twists can make one pillar more robust. Ropes are used as “fascias” for supporting the bone. There are still many unknown recipes in Horyuji temple for survivals.
    In the field of VDC(Virtual Design and Construction), BIM (Building Information Modeling) is originated not by the purpose to optimize multidimensional information such as structure, economy, process and so on, but by expre...

    Show More
    Competing Interests: None declared.