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Old 14-12-2013, 15:14   #1
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Which is Stronger?

Say you have to attach a piece of dyeema to a metal ring and you want to do it with a luggage tag or just loop it through the ring. Assuming the metal of the ring is smooth and its a static item under strain, which would you expect to be stronger?
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Old 14-12-2013, 15:57   #2
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Re: Which is Stronger?

Depends what metal the ring is made of, and how big it is. Also, what the diameter of the dyneema is. Either one could be stronger than the other, depending upon the variables.
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Old 14-12-2013, 17:10   #3
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Re: Which is Stronger?

I am only talking about the strength of the rope. Assume the rope is 1/2" dia, the metal is smooth SS 3/8 in dia wire and the ring is 4" dia.
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Old 14-12-2013, 17:47   #4
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Re: Which is Stronger?

The ring can have varying strengths depending on metallurgy and manufacture, but most stainless rings will have a breaking strength of less than 5,000# and I think 1/2" Dyeema is rated at 34,000#. One would have to assume the ring would distort and break long before the Dyeema was damaged.
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Old 14-12-2013, 17:57   #5
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Re: Which is Stronger?

I think you're asking whether the 'loop' or the 'luggage tag' is stronger?

If the radius of the line bend as compared to the line diameter is too tight, then the line will fail. You'd have to look up what that radius:diameter ratio is, I can't recall it.

In any case, if the radius is small, best to luggage-tag. If not, then just do a loop.
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Old 14-12-2013, 18:22   #6
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Re: Which is Stronger?

don't mix breaking strengths and WLL. Assume the metal is indestructible. I am only asking which knot is stronger. Sheesh. Too many engineer types in this sport.
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Old 14-12-2013, 18:28   #7
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Maybe this will helphttp://www.neropes.com/Resources/sail_reprint.pdf
http://www.neropes.com/Resources/sail_reprint.pdf see New England ropes testing it changes by rope type.
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Old 14-12-2013, 18:32   #8
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Re: Which is Stronger?

Luggage tag? Highly technical term? Is this looping through an eye?
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Old 14-12-2013, 18:35   #9
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Re: Which is Stronger?

I misunderstood the OP as well and thought he was talking about the relative dyneema/metal strengths.

i'm assuming that you are talking about a line with both ends secured - otherwise "a simple loop" doesn't make sense. I would expect the "luggage tag" (aka cow hitch) to be stronger in this case.
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Old 14-12-2013, 19:55   #10
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Re: Which is Stronger?

With a bend that sharp I would think the ring hitch would be stronger assuming the loop in the line is from a eye splice. Just because each leg would only be carrying half the load.

If the eye is created from a knot, I really don't know. I haven't seen any test of dyneema strength loss based on bending radius. It is recomended that it be kept to a minimum of 8:1 (the same as polyester lines) but I haven't seen anything testing how much strength is loss from this versus from the knot itself.
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