Deck Hardware Reinforcement Methods - Sandwich foam epoxy layup

Discussion in 'Fiberglass and Composite Boat Building' started by Ismotorsport, Mar 8, 2012.

  1. Ismotorsport
    Joined: Feb 2012
    Posts: 89
    Likes: 7, Points: 0, Legacy Rep: 53
    Location: California

    Ismotorsport Junior Member

    Wanted to ask if anyone could share or point me in the correct direction regarding reinforcing deck hardware areas during an sandwich epoxy hand layup. It seems some just go with a higher density foam in those areas, while others go with solid laminate. In either case, I would think that you need a sizable additional laminate patch over the area to disperse the loads. ?? Also is there a particular fiber orientation relating to the loads on the hardware??
    I am talking in a 50ft sailboat where loads are significant....
    Thanks
     
  2. latman
    Joined: Mar 2010
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    Location: Australia

    latman Junior Member

    I only make human powered kayaks and skis ,but I would just replace the foam with the same thickness of plywood in those areas
     
  3. Herman
    Joined: Oct 2004
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    Location: The Netherlands

    Herman Senior Member

    In general the laminate is strong enough by itself, but transferring the load from bolts to laminate is the challenge. Some extra laminate can help. Really high load fittings could need some extra laminate, and/or an extra piece of reinforcement.

    There is a very recent thread on materials for fittings in sandwich constructions in the "materials" section of this forum.
     
  4. Ismotorsport
    Joined: Feb 2012
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    Location: California

    Ismotorsport Junior Member

    Appreciate that, will look it up Herman. As for backing plates, if one is using g10 for backing plates, can these just be roughed up and epoxied in place? Or should there have to be a cloth layer placed over it for additional strength?
    Assuming one just goes with just cloth buildup in that area, is 45+\- the best cloth to disperse the loads to surrounding area?

    Thanks
     

  5. Stumble
    Joined: Oct 2008
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    Location: New Orleans

    Stumble Senior Member

    When using G10 I don't even use 4200. Remember this is taking the place of a really large washer to spread the load, it doesn't need to be securely attached since the bolts will take care of that, what you are trying to do is disperse the load, which just takes surface area.
     
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