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Recent content by polymire

  1. polymire

    surface coating for hardness

    OK there are two different erosion mechanisms that you can protect against.... impingement sliding wear (including powder or grit sliding back and forward across the surface). The impingement protection can be done by many different materials. .010 thick stainless steel bonded onto the...
  2. polymire

    Harpcloth, Lockheed C130 parts

    This probably isn't that much help but.... 'GFAE' probably is an abreviation for 'Government furnished Aerospace Equipment'. 'GFE' might be an abreviation for a company... www.gfemfg.com hope this helps
  3. polymire

    NAS 1836 Composite Panel Fasteners

    Sorry I dont have any of these, but a few ideas... Ask Bell / Boeing which other Comanche parts use these fasteners and who the suppliers are for those parts. you can then call them and do a deal. Alternativiely ask the fastener manufacturers who they have tecently supplies any of these...
  4. polymire

    How to do the structural analysis of a simple composite structure??

    For simple calculations of composite structures, there is nothing 'magical' about composite materials, they have a thickness and a stiffness. One of the problems is that the stiffness changes with direction (depending on the cosnstruction of the composite). So this question can be translated...
  5. polymire

    Bearing strength failure mode in the bolted joint

    OK bolt bearing strengths for composites have been sucessfully analyzed and verified by testing, so that there are complete design rules for analyzing bolted joints. Generally bolted joints are not analyzed in Nastran or other FE modelling. The calculations are "hand calculations" or...
  6. polymire

    Criteria regarding Resin Content

    The general wisdom is that if you exceed about 65% fiber volume (35% resin) then the "through thickness" properties will begin to fall, for example Inter-laminar shear strength, impact resistance etc. for best properties aim for 60% +/-5%
  7. polymire

    Honeycomb Core

    Well, I would agree with you that machining honeycomb to such a tight tolerance implies they dont understand. Free standing honeycomb can be pulled or pushed, with very little force to change it length/width. If the honeycomb is bonded down onto temporary backing paper then yes, you should be...
  8. polymire

    Looking for carbon graphite tube

    Right there are quite a few suppliers of carbon fiber/epoxy and carbon fiber/Vinylester rods and tubes. Try... http://www.cssales.com or http://www.voltaircube.com or you can try a Google search, Keyword "Micro Carbon Rods"
  9. polymire

    Looking for nonwoven carbon / carbon foam

    There seems to be a few mutually exclusive requirements Carbon materials can broadly be divided into two.. Graphitic or amophous The graphitic carbons are the ones with high thermal ane electrical conductivity. However both types of carbon are essentially ceramic in terms of their mechanical...

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