The Worst Shockload on Amsteel Dyneema 1/8” (3.2mm)

OK, maybe not the WORST, but as hard as I’m willing to try. This is relevant to my shockloading post. The setup:

I shortened up the cord to 8’ (vs 10’), jumped higher, and wore rubber-faced gloves to make sure no energy was lost to slips on the rap device (here a supemunter, vs. the no-twist Munter, which did slip after a 32” jump). Why is this ectreme? The Amsteel at the site of interest was 15', 7.5'x2, and there would always be some added rap rope below the Amsteel sling. The two slings that people would hypothetically connect to, were 16" different in size.

 The dyneema had previously been used in shockloads up to 500 lbs, but was rebagged after each previous jump; the simple act of rebagging seems to bring back some "construction stretch."

The max forces, as measured on the 3200 Hz S-cell, were:

1^st jump 24”+              481 lbs

(Dyneema tautened and became hard after 1st jump)

2^nd jump 24”+             760 lbs

3^rd jump 32”+              841 lbs

The Tindeq recorded only the 1^st jump, as it reset to 30-second time-out:

Here is what the measuring devices looked like in series:

The S-cell was tared, then the Tindeq was tared before the test.