Panel sandwich aluminium

Discussion in 'Materials' started by Stefano73, Jun 22, 2013.

  1. Stefano73
    Joined: Feb 2013
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    Location: Reggio Calabria Italy

    Stefano73 Junior Member

    At a trade show in the railway sector I visited the booth of aluminum sandwich panel made ​​in Germany Metawell.
    It is interesting for the internal divisions.

    Stefano
     

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  2. Mr Efficiency
    Joined: Oct 2010
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    Mr Efficiency Senior Member

    Do you know how it is bonded ?
     
  3. Ad Hoc
    Joined: Oct 2008
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    Ad Hoc Naval Architect

    Stefano

    This type of product has been around for along time, since the late 90s.
     
  4. Ilan Voyager
    Joined: May 2004
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    Ilan Voyager Senior Member

    This kind of "corrugated" panel is older than that. Also it has been done in phenolic impregnated paper and polyethylene. It has been tried on planes in the fifties in alu and stainless steel.

    I've seen for the alu panels the glued version and the brazed version. Both have been tried by navies with mitigated results mainly with corrosion problems and fire hazard. On warships, after some bad fire adventures, aluminium is not in favor, except for some small boats, and never in the form of honeycomb or foam panels which burn too easily.

    There is also a problem of transversal rigidity. The problem lies in the alloys used for these panels; there is no resistance to corrosion in salt water. It's surely excellent on trains or land applications, but it's more doubtful on boats. There are not specially light also.
     
  5. tunnels

    tunnels Previous Member

    used a simular principle before a couple of times

    Have hand made flat panels with a much bigger version of ripples 60 mm thick using divinicell foam H 60 4 layers of glass in the flat surface then the foam bonded with core bond the sides 4 layers of triaxle 45/45/90 and then the other foam also stuck in on core bond and then 4 layers of glass over the top surface , was used for water tight collision bulkheads in a mega yacht ,one in the forward end and one in the after end !! spanned over 10.5 metres across and almost 9 metres tall with Floors glassed to each side to act as stiffeners . all made on a big work bench !! took 40 people to move it off the bench and carry outside to be picked up with a crane and transported to another part of the factory to be cut and fitted to the hull

    The time before was a racing yacht but used 120mm wide H 80 20mm thick core cut on a angle each side and core bonded to the outer hull glass skin then 800 gram double bias glass laid over ,then the second layer of foam to fill in the spaces between the ones previously fitted and then the inner skin of the boat laid , this was one ridged hull with no stringers in the bottom only the topsides just below the waterline !!
    There's a lot to be said for doing this method !! I first saw this in a French racing yacht way back in 1985 !! :):D:p

    Makes for a ridged panel but only one way ,not both !!
     
  6. Ad Hoc
    Joined: Oct 2008
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    Ad Hoc Naval Architect

    Quite right. We used it on our fast ferries in the 80s, taken from the aircraft industry, to save some weight :)

    BTW..good to see you again IV :)
     

  7. tom28571
    Joined: Dec 2001
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    tom28571 Senior Member

    I saw similar panels in the 1960's. Bonding was accomplished by heating the plastic, which melts at the join to the metal. Many materials that cannot be glued in the normal manner can be bonded by melting the material with high surface tension onto the other surface. The liquid form (of polyethlene or even teflon) has lower surface free energy and thus wets the other surface and bonds to it.
     
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