{"id":550,"date":"2018-04-17T10:07:45","date_gmt":"2018-04-17T08:07:45","guid":{"rendered":"http:\/\/194.57.84.143\/?p=550"},"modified":"2018-04-23T14:03:46","modified_gmt":"2018-04-23T12:03:46","slug":"metamaterial-with-a-twist","status":"publish","type":"post","link":"https:\/\/gradschool.eiphi.ubfc.fr\/?p=550","title":{"rendered":"Metamaterial with a twist"},"content":{"rendered":"<p><strong><u>Axis 1 &#8211; Self-Adaptive Architectures:<\/u><\/strong><\/p>\n<h1><strong>Metamaterial with a twist<\/strong><\/h1>\n<p>As for other types of so-called \u201cmetamaterials\u201d (photonic, acoustical, sismic\u2026), which are objects periodically structured at a sub-wavelength scale, there is a fair amount of hype developing <strong>mechanical metamaterials<\/strong> that can exhibit behaviours inaccessible to homogeneous materials and possibly interesting for structural control. A breakthrough discovery has been published in the <strong>Nov.24 issue of<\/strong> <a href=\"http:\/\/science.sciencemag.org\/content\/358\/6366\/1072\/tab-pdf\"><strong>Science<\/strong><\/a>, and making its <strong>cover<\/strong>, thanks to a fruitful collaboration between researchers of <a href=\"http:\/\/members.femto-st.fr\/muamer-kadic\/\">EIPHI<\/a> and <a href=\"https:\/\/www.aph.kit.edu\/wegener\/english\/index.php\">KIT<\/a> in Karlsruhe: from cubic building blocks, they purposely designed, modelled and fabricated an <strong>adequate <\/strong><a href=\"https:\/\/phys.org\/news\/2017-11-metamaterial-left-response-straight-solid.html\"><strong>chiral metamaterial<\/strong><\/a> that turns out to be<strong> efficient in converting, <\/strong>for the first time,<strong> a purely linear compression<\/strong> force into<strong> a purely rotating torsion. Such unusual deformation behaviour is indeed not allowed by the classical rules of solid mechanics. <\/strong>Moreover, this three-dimensional metamaterial is also providing enhanced rigidity while being prone to structural lightening. As a foreseen application, advanced mechanical designs based on such a metamaterial might be efficient in protecting structures from unwanted mechanical shock waves.<\/p>\n<p>&nbsp;<\/p>\n<div id=\"attachment_551\" style=\"width: 310px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-551\" class=\"size-medium wp-image-551\" src=\"http:\/\/194.57.84.143\/wp-content\/uploads\/2018\/04\/image1-300x300.png\" alt=\"\" width=\"300\" height=\"300\" srcset=\"https:\/\/gradschool.eiphi.ubfc.fr\/wp-content\/uploads\/2018\/04\/image1-300x300.png 300w, https:\/\/gradschool.eiphi.ubfc.fr\/wp-content\/uploads\/2018\/04\/image1-150x150.png 150w, https:\/\/gradschool.eiphi.ubfc.fr\/wp-content\/uploads\/2018\/04\/image1-768x768.png 768w, https:\/\/gradschool.eiphi.ubfc.fr\/wp-content\/uploads\/2018\/04\/image1.png 780w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><p id=\"caption-attachment-551\" class=\"wp-caption-text\">Artist view of a 3D mechanical twisted metamaterial made from an innovative two-photon-absorption-based 3D printing method with micrometre precision. \u00a9 Tobias Frenzel (KIT)<\/p><\/div>\n<p>&nbsp;<\/p>\n<blockquote><p>T. Frenzel, M. Kadic, M. Wegener, \u201cThree-dimensional mechanical metamaterials with a twist\u201d, <strong>Science<\/strong> <strong>358<\/strong>, 6366, 1072-1074 (Nov. 24 2017). <a href=\"http:\/\/www.ubfc.fr\/wp-content\/uploads\/2018\/02\/Science_Kadic_nov17.pdf\">DOI: 10.1126\/science.aao4640<\/a><\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>Axis 1 &#8211; Self-Adaptive Architectures: Metamaterial with a twist As for other types of so-called \u201cmetamaterials\u201d (photonic, acoustical, sismic\u2026), which are objects periodically structured at a sub-wavelength scale, there is a fair amount of hype developing mechanical metamaterials that can exhibit behaviours inaccessible to homogeneous materials and possibly interesting for structural control. A breakthrough discovery [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[5],"tags":[],"class_list":["post-550","post","type-post","status-publish","format-standard","hentry","category-self-adaptive-architectures"],"acf":[],"_links":{"self":[{"href":"https:\/\/gradschool.eiphi.ubfc.fr\/index.php?rest_route=\/wp\/v2\/posts\/550","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gradschool.eiphi.ubfc.fr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gradschool.eiphi.ubfc.fr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gradschool.eiphi.ubfc.fr\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/gradschool.eiphi.ubfc.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=550"}],"version-history":[{"count":5,"href":"https:\/\/gradschool.eiphi.ubfc.fr\/index.php?rest_route=\/wp\/v2\/posts\/550\/revisions"}],"predecessor-version":[{"id":593,"href":"https:\/\/gradschool.eiphi.ubfc.fr\/index.php?rest_route=\/wp\/v2\/posts\/550\/revisions\/593"}],"wp:attachment":[{"href":"https:\/\/gradschool.eiphi.ubfc.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=550"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gradschool.eiphi.ubfc.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=550"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gradschool.eiphi.ubfc.fr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=550"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}