Roving VS non-woven Biax

Discussion in 'Fiberglass and Composite Boat Building' started by Roy Berntsen, Aug 17, 2016.

  1. Roy Berntsen
    Joined: Jan 2011
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    Location: Oslo

    Roy Berntsen Roy Berntsen Design

    I wonder if there is a conversion rate to get from a roving to multiaxial stiched-biax in terms of weight or thickness.

    I have calculated scantlings for roving but want to use AMT. AMT should give similar properties with less weight/thickness

    Thanks for any help on this.
     
  2. messabout
    Joined: Jan 2006
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    Location: Lakeland Fl USA

    messabout Senior Member

    Doctorx, I suspect that thickness will be a major stiffness determinant without serious regard to the material in the space between the most remote fibers.
     
  3. Roy Berntsen
    Joined: Jan 2011
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    Location: Oslo

    Roy Berntsen Roy Berntsen Design

    Well this is a sandwich configuration, so not so much. I was thinking non-woven had better mechanical properties than woven roving, but if they both are made of e-glass they would probably be similar in tensile/compression/stretch properties... How ever in a laminate non-woven would perform better due to no over under weave structure?

    But I guess I can compare:
    Roving, 814g/m2 = 1,05 mm
    biax 0/90, 816g/m2 = 1,06 mm

    Roving 610g/m2 = 0,79 mm
    biax 0/90 612g/m2 = 0,79

    This tells us that roving and amt fibers has the same thickness for same weight. This meens we have to look at the mechanical properties to see what can be obtained with non-woven vs roving.

    I need to get some datasheets and see. Anyways the polyester will probably be the weakest point in the sandwich so maybe this is just a waist of time...?
     

  4. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    Woven is much cheaper, a shame to use with an expensive core though. Fibres are not straight, so loses strength that way. More suited to single skin glass.
     
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