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  1. #21
    Senior Member
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    Quote Originally Posted by Brian View Post
    • As a matter of fact, all three nylon samples I tested showed identical stress/strain curves (Young's Modulus) regardless of exposure, so UV exposure does not change how brittle the fabric is in tension.
    Does that suggest that, all other things equal, non-calendared nylon would have a somewhat stronger tensile strength, or is that the wrong conclusion?
    .. truly to enjoy bodily warmth, some small part of you must be cold, for there is no quality in this world that is not what it is merely by contrast. Nothing exists in itself. If you flatter yourself that you are all over comfortable, and have been so a long time, then you cannot be said to be comfortable any more. - Herman Melville

  2. #22
    Senior Member Brian's Avatar
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    Not quite. The tensile strength is directly correlated to the fabric denier. For the 25-200 denier fabrics I had tested, they all stretched the same amount, regardless of weight and UV exposure. Ultimate strength (amount of force at failure) was very different, however, with 200D nylon requiring over twice the force for failure. But these are loads that would never be seen in a tarp panel, and so 200D tarps are a thing of the past!

    I hadn't tested any non-calendared nylon, but I would bet that it would be very similar in
    Brian MacMillin
    www.OutdoorEquipmentSupplier.com
    Home of the new MacCat Gen4 hammock tarps

  3. #23
    Senior Member Cannibal's Avatar
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    Quote Originally Posted by Brian View Post
    I've got two new tarps coming out soon
    Yeah, yeah, yeah. I've heard it before.
    I'm not going to believe it till I see pictures of it.
    Trust nobody!

  4. #24
    Senior Member Barefoot Child's Avatar
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    Glad to hear you are back on the forum..at least for awhile before school gets ahold of you again. You build it, and we will test it (I mean use it). Good data, keep it coming.

    You be...one of Da men.
    "If'n I'm gonna fall, someone is gonna' watch."
    Sean Emery

  5. #25
    MacEntyre's Avatar
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    Quote Originally Posted by Brian View Post
    ...45 lbf per inch ...
    Love that engineering notation...

    - MacEntyre
    "We must, indeed, all hang together or, most assuredly, we shall all hang separately." - Ben Franklin
    www.MollyMacGear.com

  6. #26
    Senior Member KerMegan's Avatar
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    Quote Originally Posted by Brian View Post
    (45 lbf per inch of fabric width),
    lbf is pound feet?
    so, how might that convert to Newtons (SI unit of Force)?
    and yes I've heard and used all the Fig jokes...
    KM

  7. #27
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    foot-pounds, at least in the wrench-turning world. 1.3558179483314 Newton-meters.
    .. truly to enjoy bodily warmth, some small part of you must be cold, for there is no quality in this world that is not what it is merely by contrast. Nothing exists in itself. If you flatter yourself that you are all over comfortable, and have been so a long time, then you cannot be said to be comfortable any more. - Herman Melville

  8. #28
    Senior Member
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    per foot-pound, that is.
    .. truly to enjoy bodily warmth, some small part of you must be cold, for there is no quality in this world that is not what it is merely by contrast. Nothing exists in itself. If you flatter yourself that you are all over comfortable, and have been so a long time, then you cannot be said to be comfortable any more. - Herman Melville

  9. #29
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    Quote Originally Posted by Mustardman View Post
    Well, seeing as how I'm in Georgia now and will be moving to Colorado around March, I could be in the perfect boat to test them in a variety of environments...


    just sayin'
    i guess you found a job then. where did you guys going to live?

  10. #30
    Senior Member KerMegan's Avatar
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    Quote Originally Posted by vitamaltz View Post
    foot-pounds, at least in the wrench-turning world. 1.3558179483314 Newton-meters.
    Thanks muchly!

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