MSGID: 1:317/3 647ac1eb   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
    Buckle up! A new class of materials is here    
      
     Date:   
         June 2, 2023   
     Source:   
         Universiteit van Amsterdam   
     Summary:   
         Would you rather run into a brick wall or into a mattress? For   
         most people, the choice is not difficult. A brick wall is stiff   
         and does not absorb shocks or vibrations well; a mattress is soft   
         and is a good shock absorber. Sometimes, in designing materials,   
         both of these properties are needed. Materials should be good at   
         absorbing vibrations, but should be stiff enough to not collapse   
         under pressure. A team of researchers from the UvA Institute of   
         Physics has now found a way to design materials that manage to do   
         both these things.   
      
      
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   FULL STORY   
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   Usually, the two characterizations of a material are mutually exclusive:   
   something is either stiff, or it can absorb vibrations well -- but   
   rarely both.   
      
   However, if we could make materials that are both stiff and good   
   at absorbing vibrations, there would be a whole host of potential   
   applications, from design at the nano-scale to aerospace engineering.   
      
   Buckling does the trick A team of researchers from the University of   
   Amsterdam has now found a way to create materials that are stiff, but   
   still good at absorbing vibrations -- and equally importantly, that can   
   be kept very light-weight. David Dykstra, lead author of the publication,   
   explains: "We discovered that the trick was to use materials that buckle,   
   like thin metal sheets. When put together in a clever way, constructions   
   made out of such buckled sheets become great absorbers of vibrations --   
   but at the same time, they preserve a lot of the stiffness of the material   
   they are made out of. Moreover, the sheets do not need to be very thick,   
   and so the material can be kept relatively light." The image shows an   
   example of a material that uses this buckling of metal sheets to combine   
   all of these desired properties.   
      
   A host of applications The researchers thoroughly investigated the   
   properties of these buckled materials, and found that they all showed this   
   magical combination of stiffness and ability to dissipate vibrations. As   
   known materials do not have this desired combination of properties,   
   the new lab-made materials (or metamaterials) have a very wide range   
   of potential applications, and at a very wide range of scales. Possible   
   uses range from meter-sized (think of aerospace, automotive applications   
   and many other civil designs) to the microscale (applications such as   
   microscopes or nanolithography). Dykstra: "Humans like to build things --   
   small things and big things -- and we almost always want these structures   
   to be light. If that can be done with materials that are both stiff and   
   good at shock-absorbing, many existing designs can be improved and many   
   new designs become possible. There really is no end to the possible   
   applications!"   
       * RELATED_TOPICS   
             o Matter_&_Energy   
                   # Materials_Science # Civil_Engineering   
                   # Engineering_and_Construction # Nanotechnology #   
                   Graphene # Inorganic_Chemistry # Optics # Chemistry   
       * RELATED_TERMS   
             o Materials_science o Metallurgy o Triboelectric_effect o   
             Ultraviolet o Hygroscopy o Metal o Formaldehyde o Nanoparticle   
      
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   Story Source: Materials provided by Universiteit_van_Amsterdam. Note:   
   Content may be edited for style and length.   
      
      
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   Journal Reference:   
      1. David M.J. Dykstra, Coen Lenting, Alexandre Masurier, Corentin   
      Coulais.   
      
         Buckling Metamaterials for Extreme Vibration Damping. Advanced   
         Materials, 2023; DOI: 10.1002/adma.202301747   
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   Link to news story:   
   https://www.sciencedaily.com/releases/2023/06/230602115110.htm   
      
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