would be interesting to see this test again with different knots, since most of the ropes broke due to compression on the knot. perhaps some fishing knots that put less pressure on the rope. eg "blood knot"
Never sadly a dead horse. This was the saying I heard often when new working offshore. Always put the saddle on the “live end and the ubolt on the dead end. This prevents premature breakage on cable splices. It was surprising that at least one of the ropes didn’t fail at the knot as knots are usually the point of weakness in rope connections. Great video, thanks!
You should double the steel result because that was a single rope and all others were doubble. Or half all others to get the strength of a single rope.
From the diameter follows the cross-sectional area and together with the force, the tensile stress, which no longer depends on the geometry but is material-dependent. However, it is much more important for comparisons to do without knots because they are always a weak point (up to 80% strength loss) and tend to melt and flow.
Be accurate test must involve same aparent diameters of rope ( despite number of wires in them, aparent because are braided differently sometimes ) and same mode of knots or/ and clamping ( type of clamps, numbers) and also at steel should be full loop...
@@JackmeriusTacktheratrix7 I would take a clamping cone as a first choice, do not kink the rope. The present rope clamps would also do, but not as well, because they are not adjusting like cones. Last but not least, I would choose a multiple wrap and rope clamps at the upper and lower attachment point (the shackle pins), although there will be creep, friction and melting again, but thanks to the Euler-Eytelwein formula, the tensile force is transferred evenly and quickly into the shackle pin (compare with a winch).
If something, this demonstration shows the importance in knowing how to tie knots. No use for a super strong rope if your knot slips. With right type of bend or splice the results in breaking strength would also be quite different.
And you know what, this is not a standard scientific experiment. This is a practical experiment which applying knots that ordinary people usually do. So, take it easy. Enjoy and appreciate this channel's effort.
Hello! First that's not kevlar, that's Dyneema 75 and its no surprise dyneema is stronger than inox. There's even stronger materials like vectram, technora, etc... the knot you tie is really bad (no offense), you should learn some nautical knots. But really the things is a knot (any knot) weakens the rope by 60% for real, you should splice the line (search "splicing dyneema eye") so you can really test the resistance. thanks!
Why use... whatever that bend is, coupled with metal brackets to help secure them, when you could just use a secure bend like a Zeppelin Bend to tie the two rope ends together?
Нижнюю проушину нужно было изнутри заполировать. Там есть острый рубец от литья. Он провоцирует разрыв верёвок. Никаких металлических стяжек ставить не надо было. Есть много самозатягивающихся узлов. Изучите эту тему. Стяжки выглядят несерьёзно, по-детски.
Вот, прям не знаю. Самозахваты типа булиня - перекусят(пережгут). Плоские (любые) - протянутся... Грейпвайн? С парой контр-штыков должен выдюжить... Автор вязал что-то вроде австрийкого без петли(очень похоже), а он считается надежным на все стороны, хотя ослабляет веревку (перекусывает). Но может он 1 раз ошибся с направлением и получилась бабочка... а у нее назначение - травить (снижать рывок). =_= Там Нипанятна... Ну, зато - поумничал (я).
Always. Motion and force generate frictional heat that melts many plastics. Highly stretchable synthetic fibers therefore always break in knots. For a comparison of materials, straight sections should have been clamped with cones. Second best possibility would be simple multiple looping before a pinch, so that Euler-Eytelwein's formula helps with force application.
The event that a knot rubs on the rope will be evaluated to avoid the impact force. According to this experience, what matters is the resistance of the materials that the ropes are made of, and if the equality of conditions is met in the majority, the test is fine. Except for the steel cable, which had no knot, only a ratchet.
The Kevlar was no Kevlar but Dyneema and those Ropes in 10mm can easily reach a breaking strength more then 12 Tons . But a knot in such a Rope is a sin . You would reach about 20 Tons if you use not a loop with a knot but a loop with a Splice
Уважаемый автор! Веревки нужно было связывать с помощью узла "грейпвайн". Хомуты тогда бы не понадобились. / Dear author! The ropes had to be tied with a grapevine knot. The clamps would not have been needed then.
This test is not valid because there where far to many variables from how each rope was secured because some used multiple clamps of steel and some used only one or two so this could give flase data due to uses of steel clamps so if had a control with exactly same amount of steel clamps then the data would infact be more reliable and then infact could be used correctly because from a safety standards on ropes this could if go off this put people at risks
Rope Strength Test Results : 1. Jute Rope 224 Kg 2. Nylon Rope 310 Kg 3. Textile Rope 1.070 Kg 4. Climbing Rope 2.837 Kg 5. Steel Rope 4.062 Kg 6. Kevlar Rope 6.219 Kg
Nem ártott volna rendes, szabványosított rögzítés módokat használni,( kötéltehnika, préselt acélsodronyvég) mert így az eredmények eltérhetnek különböző mértékben.
Why would anyone, in their right mind "test" rope with knot? You are skewing the resoults... This can't be used in any real type of experiment... Heck, there are even standards for experiments... Also you could argue thst those hooks aren't even right way of securing rope for this.purpose... These resoults are useless there are so many factors and experiment isn't standardised in any shape or form, just trowing results to the wall and seeing what sticks
What about those ropes or one of those industrial cables encased in a matrix of large graphene pieces going perpendicular, with mesh and filled with graphene resin or concrete? Like imagine a building that’s been constructed and they’ve already laid down the metal girders. You just fill in the spaces with essentially big bridge cables going throughout it, like threading ropes through a Really dense fence. You’re essentially filling in a building with industrial cable and then filling in the empty spaces with dense sheets of thick carbon fiber, mesh and either concrete or graphene resin. If you compress the rope by itself it’s going to just be squashed For an O’Neill cylinder, My first thought was essentially sheets of carbon fiber, but instead of thin threads going through each sheet, the tiny threads are the size of The Golden Gate bridge cables (that would be your thread) I thought of essentially weaving a basket with industrial rope or cable the thickness of the Golden Gate Bridge cable. Then you sandwich that with sheets of carbon fiber on either side, and then put teeth on that, so you can thread another basket just like that inside it or over it. The thing is that each building needs to have a foundation. You can’t just make a basket like that, even if it’s essentially gigantic carbon fiber sheets. Each building needs to be anchored down, and essentially the cylinder needs to also be the foundation for everything, and like any other foundation you need big pylons. Think of the Burj Khalifa. The cylinder needs to be the foundation for that come out while also resisting torsion. Imagine the Burj Khalifa going through earthquakes or the ground literally been twisted or A meteor going through it. Like imagine trying to weave a gigantic space basket like you’re trying to make a Huge screw, but each piece also has to essentially act like a foundation with pylons/steel going through it
Who else thinks this unfair test as three did not have a device hold the knot in place, I sure if the first three had metal bracket used on them to hold the knot tight it will be much fairer test, as we don't know if the bracket help with strength test or not, plus with the rope 'was tied up in knot' the knot was different type of knot and how it done, as we never say how the knot was tied. Apart from steel rope. Plus if all rope was double apart from steel it seems which makes it unfair test also, plus we don't know what type of steel was use. If they used 2 ½ inch thick 6 x 36 IWRC (independent wire rope core) cable we will see much more fairer test. They should redo the test and tied them same way and use bracket on all of the rope, as I sure on last four I believe if they did not use the bracket then the test result will be different,
You understand the huge mistakes you made with the steel rope that you had single while the others you have double. And of course the Kevlar rope that you did the same test 2 times on the same rope with the result that it is already strained from the first time. For me this test is very wrong 👎👎👎👎
