Impact resistance test and Slackline Jumpline

To complete our testing in independent laboratory MECASEM that achieves standardization tests of our equipment, we completed our studies on the behavior of the slackline equipment and Jumpline because current tests do not represent fairly the reality of the practice in a Using slack or jump.

Presentation and explanation: 

The current machines we use are the same as in climbing or PPE Pro. Their tests are therefore based on several tensile tests which will break up. But in the slackline made; this is especially shocks repeated between produitent by slackeur vibration, wind, .... 

And Jumpline it is worse, because the jumpeur seeks to increase the amplitude of the trickline and therefore produces more violent changes. 

Thanks to the engineers we work with we could draw a parallel with the fasteners car trailers, which as Jumpline are subject to repeated shocks between acceleration and braking and especially in the same order of magnitude; of forces between 5 kN and 30 kN can be considered equivalent. As Jumpline entire force is applied mainly to one axis (bolt). . Various studies in this environment led to several standards. 

The standard that interests us is that the connection bolt and the side decks, it imposes a minimum resilience with a Rockwell of C33 fullest. 

To simplify: Mechanical resilience of materials characterizes the material's ability to withstand shocks, that is to say, to absorb energy and release it. plus Rockwell is low (<C1) more it can release energy without breaking and returning to its original state (eg rubber) by the most against the opposite Rockwell will be high (> C80) will be more less brittle and it will return to its original state and therefore will degrade with each shock and it will break the net. 

This eliminates the use of aluminum in mechanical parts to make the strength of the assembly, aluminum Mechanical with Rockwell C40 to C53.

We decided since summer 2015 to apply this standard to all our products even though the majority of our production had a lower Rockwell C33.
To perform these tests so we used hammer inertia that perform repeated shocks to high load, a machine 10 at 200 strokes / min and 300 kg to 3000 kg and another from 1000 to 8000 counts / min from 1000 kg to 6000 kg. No independent laboratory with such machines, a private company agreed to provide access to its laboratories. We thank Alex and Didier who conducted tests for us. 
So the following tests have no official value but allow to see what can cash the slackline equipment and Jumpline.
The test are practice on the maximum wll.

Test Blockers slack

Web lockerShock 10kNShock 20 kNShock 30kNShock 40kN
Rhino 60 kN10421342,234not testednot tested
Ginkgo 150kN54387920634576,362broken shackle
Rhino modified aluminum 60kN87342130not testednot tested
Maxi Ratchet 50 kN45420not testednot testednot tested

Blockers slackline were all broken in the screw central sheave except in banana modified with plates in aluminum.

The tests were conducted with several shackles and slings as they broke before blockers.

The plates were in 7075 Alu 4 mm machined fasteners she was 8.8 galvanized steel. The banana aluminum broke at the corner of the plate, being the place that suffered the most stress. This confirms that the more material has high resilience, energy dissipates much less brittle and therefore makes the room.

Test Pulley Slackline

Pulley slacklineshocks 5 kNShock 10 kNShock 16 kN
Pulley Uno 25 kN54,230not testednot tested
Pulley XP2 60 kNnot tested 143666not tested
Triceratops pulley 80 kNnot tested489322408342
48 kN Aluminium pulley TRACTEL®not tested36,378not tested

In the results must be considered an important element: the rope that has the effect of reducing the impact of the shock on the room. This is why a pulley xp2 stainless resists 60 kN more than 60 kN rhino who do not bénificie this amortized.

Test Connector

ConnectorShock 4 or 5 kNShock 10 kNShock 20 kNShock 32 kN
Kratos 22 kN carabiner13,532745 to 15 kNnot testednot tested
28 kN carabiner Camp14,876not tested not testednot tested
Alu Carabiner Camp 22 kN21764 to 15 kNnot testednot tested
Manila Steel 100 kNnot testednot tested43,067not tested
Manila Steel 166 kNnot testednot testednot tested85,254
Stainless steel shackle lyre 70 kNnot tested41 710 to 16 kNnot testednot tested 
Manila textile 50 kN5not tested not tested

Given the results we strongly discourage the use of textile shackles Jumpline and even slackline highline or fast shocks are not dissipated in the Dyneema.

We can see that the stainless steel shackle proportionally more resilient than shackles hr, this is dù resilience of stainless steel which is lower than the high-strength steels.


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