Polyester ages to 1/4 strenght with 1 million cycles and design rules

Discussion in 'Class Societies' started by mustafaumu sarac, Nov 22, 2017.

  1. mustafaumu sarac
    Joined: May 2017
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    Location: Istanbul

    mustafaumu sarac Senior Member

    I read eliasson book and there was a graphic which shows polyester in grp ages in 1 million cycles to 1/4 strenght.

    Do we design boats with final , middle or first strenght while using class rules ?
  2. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    Surely that would depend on the laminate under consideration, and the load applied in each cycle.
  3. rxcomposite
    Joined: Jan 2005
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    rxcomposite Senior Member

    There is no first, middle or final strength in Class rule. Just the minimum strength that must be complied with.
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