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Home > miscellaneous junk/projects > load testing
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A2, C1, C2, and C3.

A2 is discussed elsewhere. search for it.

C1 was an intentionally small box, to see if there was anything interesting if i didnt tack all the way to the sides. it broke at around 2400 lbs. i forgot to reset the tensile tester and didnt get an exact max read, but its within a hundred pounds of 2400. there wasnt anything particularly interesting about it.

C2 was a sh*tty belay loop. i actually broke it before i took a picture, but it featured five lines of long-axis stiches and some shitty rows of tacks at the overlap (65 at the tack). it broke at the side of the tack at 43 kn, and it was used webbing.

C3 was intentionally sewn cocked (see how the webbing sides are slightly non-parallel). i did this because i was worried that imperfectly lining up the webbing would result in reduced webbing when one side of the nylon was stressed more than the other (one side would effectively be tighter than the other under load). this is cocked-up more than i would ever do it in the real world, so it will give me an idea about how significant the non-parallelness is.

it had 197 stitches and broke at 28.6 kn at the webbing at the side of the seam. the other slings from this same piece of webbing (used webbing with no obvious flaws) that broke at the side of the tack failed at 25 and 30 kn, so there is no obvious weakening of the seam due to the cocked alignment. however the fact that these broke at the tack means we dont know how it affected seam strength- just that they are still pretty darn strong. those samples were D4 and D5. incidentally, the stitching was *at least* 32 lbs per stitch, which is right in the middle of the range of aligned-seam stitch strengths.

keywords: Cbatch

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