BV NR546 - Nxx determination

Discussion in 'Class Societies' started by Ogrim, Jun 5, 2019.

  1. Ogrim
    Joined: Jan 2013
    Posts: 9
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    Location: Southampton [UK]

    Ogrim Junior Member

    Hi,

    I am immersing in the BV standards (NR500 and NR546) and I am in trouble for the calculation of Nxx, Nyy, Nxy .... require to determine SigmaAd.
    Would anyone be able to help me on this?

    [​IMG] [​IMG]


    Thank you
     
    Last edited: Jun 5, 2019
  2. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    Go to the library and pick up a copy of Theory of Composites Design by Stephen Tsai. Basically you are going to need to calculate the effective modulus of the lamination based on each layer material, matrix, and direction. FWIW, he used to sell a spreadsheet/teach a class to help with the calculation, but that was 30 years ago. (edit MIL-HDBK 17 no longer had laminate design in it, only testing)
     
    Last edited: Jun 6, 2019
  3. Ogrim
    Joined: Jan 2013
    Posts: 9
    Likes: 1, Points: 3, Legacy Rep: 13
    Location: Southampton [UK]

    Ogrim Junior Member

    thank you for your answer,

    I'm gonna study composite design,
    I found another way for a simplest evaluation, using ComposeIT. Free software by Bureau Veritas. Once laminate and pressures are defined on the soft, it compute stresses on each layer and give value for Mx, My, Nx ...
     
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