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  1. tapirg

    Test methods & laminate definitions to measure CTE of composite lamina

    I’m trying to standardize a method to characterise CTE values for the composite materials we currently use. (to lamina level longitudinal and Transverse) I’ve look into some literature, forums but I haven’t found much information about it. Basically I’m looking to test a wide range of fabrics...
  2. tapirg

    Drill bits/ Drilling speeds on a FRP/Al Assy

    Thanks for your quick response RPstress. Picture should be now attachedhttp://files.engineering.com/getfile.aspx?folder=8593acc0-8841-44e7-a01c-e754898917d3&file=Pictorical_rep(2).jpg
  3. tapirg

    Drill bits/ Drilling speeds on a FRP/Al Assy

    Hi All, I have uploaded a pictorical representation showing a section of the the components I have to drill through. Thanks
  4. tapirg

    Drill bits/ Drilling speeds on a FRP/Al Assy

    Sorry, I will upload the drawing quite soon
  5. tapirg

    Drill bits/ Drilling speeds on a FRP/Al Assy

    Hi All; I have to drill through a machined aluminium (7075-T7351) alloy ring slot and the carbon ring, which is slotted, into the Ali ring (please see picture attached for more references) and I am not sure which type of drills and “drilling speeds” should I use. Final hole size is 6.35 mm Ø...
  6. tapirg

    Lightning Strike Protection For Composite Structure

    First of all, many thanks all of you for your comments. The main Idea was to use as first layer one ply of glass fibre (or adhesive) then the dry bronze mesh and then the carbon laminate as normal. The reason I need this first layer of glass/adhesive is that I need something tacky to be able...
  7. tapirg

    Lightning Strike Protection For Composite Structure

    We are using a prepeg bronze mesh as 1st ply in the lay-up of some composite panels for lightning strike protection purposes. My problem is that we ran out of this prepeg material and we need to lay-up a nose cone using a dry bronze mesh instead. As there is not resin in the mesh I have been...
  8. tapirg

    Phenolic/Foam issue

    Thank you very much all for your Ideas We are using a new perforated released film with more and bigger holes than the old one and we have also perforated with holes the pieces of foam to improve venting and this seem to be working as we haven’t had any scrap panels for the last week. I will...
  9. tapirg

    Phenolic/Foam issue

    We are using HexPly HT93 135 C Curing phenolic matrix (HEXCEL), HT93-6k 2x2 TWILL PHENOLIC 285gsm 1200mm more precisely, in some of our new components combine with some strips of Rohacell foam IG51 and we are having some issues with the foam on those components (please see attached document to...

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