Symmetric Laminate with Double Bias Plys

Discussion in 'Fiberglass and Composite Boat Building' started by Johnfirstime, Feb 26, 2019.

  1. Johnfirstime
    Joined: May 2017
    Posts: 10
    Likes: 0, Points: 1
    Location: Canada

    Johnfirstime Junior Member

    This may seem like a stupid question but I'm looking at making a laminate that incorporates +45 and -45 degree plys.

    Since my part is significantly longer than the width of available fabric rolls, I will need to lay down the fabric parallel to the longitudinal axis of the part. However, I have only been able to find double bias fabric with the +45/-45 stacking sequence and not the -45/+45 stack. Therefore, even when flipping the fabric end over end, or rotating it 180 degrees, I am not able to achieve a symmetric laminate.

    How have others gotten around this problem? Should I just do a better job looking for fabrics?

    Thanks in advance!
     
  2. gonzo
    Joined: Aug 2002
    Posts: 13,715
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    Location: Milwaukee, WI

    gonzo Senior Member

    What is the symmetry that you want to achieve? I don't quite understand the problem. If the design requires the lay of the fibers to be absolutely different, you can always buy uni-directional cloth.
     
    Reefrunner likes this.
  3. Reefrunner
    Joined: Feb 2019
    Posts: 12
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    Location: Australia

    Reefrunner Junior Member

    Very cryptive question. Need more of an explanation...
     

  4. gonzo
    Joined: Aug 2002
    Posts: 13,715
    Likes: 416, Points: 93, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    If you want symmetry, that is the fibers on the outside of the laminate are parallel, uni-directional cloth can be oriented in any way. It takes more labor, but you will have complete control on fiber orientation.
     
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