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  #21  
Old 11-09-2012
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Re: sailcloth: laminated or woven?

Can you define folded. and how does that relate to a Kevlar sail. the ones I have that contain Kevlar are holding up well. the laminating film is what breaks down an then the Kevlar looses it support. as for the carbon sails they don't last long at all. I do have several yards of carbon rags stored in the garage.
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Last edited by overbored; 11-09-2012 at 11:44 AM.
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  #22  
Old 11-09-2012
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Re: sailcloth: laminated or woven?

As I remember from long ago the ASTM test method dictates a cyclical 90 degree bend with zero applied tension ... as the standard. If you assume other bend angles, you'll have to set up your fold-fatigue testing machine to the typical fold that you desire.
All the flexural fold fatigue testing 'relates' to the standard ASTM method, just like all physical testing to determine material properties; if you need to evaluate outside of those parameters ... set up your own testing machine, etc. to your actual or assumed conditions.
Guesses and assumptions dont count.
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