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Assessment of Kernmantle Ropes in terms of Sheath Slippage: Method and Results

Krzysztof Baszczyński
Krzysztof Baszczyński
   | Dec 30, 2022
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Article Category: Research Article
Published Online: Dec 30, 2022
Page range: 67 - 73
DOI: https://doi.org/10.2478/ftee-2022-0053
Keywords
© 2022 Krzysztof Baszczyński, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

Guided type fall arrester protecting against falls from height with a flexible anchor line made of kernmantle rope: 1 – flexible anchor line (kernmantle rope), 2 – guided type fall arrester (A – closed, B – open)
Guided type fall arrester protecting against falls from height with a flexible anchor line made of kernmantle rope: 1 – flexible anchor line (kernmantle rope), 2 – guided type fall arrester (A – closed, B – open)

Fig. 2

Examples of damage to flexible anchor line
Examples of damage to flexible anchor line

Fig. 3

Diagram of a kernmantle rope loading system for sheath slippage testing [6,7]: F – loading force, V – rope movement speed, 1 –kernmantle rope tested, 2 – movable steel plates, 3 – fixed steel plates
Diagram of a kernmantle rope loading system for sheath slippage testing [6,7]: F – loading force, V – rope movement speed, 1 –kernmantle rope tested, 2 – movable steel plates, 3 – fixed steel plates

Fig. 4

Design of the rope clamping module: 1 – the rope tested, 2 – movable and fixed plates, 3 – supporting structure, 4 – weights exerting a loading force of F = 50 N on the plates, 5 – Kevlar string I
Design of the rope clamping module: 1 – the rope tested, 2 – movable and fixed plates, 3 – supporting structure, 4 – weights exerting a loading force of F = 50 N on the plates, 5 – Kevlar string I

Fig. 5

Sample design of plates on a stand for testing sheath slippage in kernmantle ropes: a – movable plate, b – fixed plate
Sample design of plates on a stand for testing sheath slippage in kernmantle ropes: a – movable plate, b – fixed plate

Fig. 6

Stand for testing sheath slippage in kernmantle ropes: 1 – rope compression module, 2 –rope tested, 3 – Kevlar string I, 4 – drive module, 5 – Zwick testing machine
Stand for testing sheath slippage in kernmantle ropes: 1 – rope compression module, 2 –rope tested, 3 – Kevlar string I, 4 – drive module, 5 – Zwick testing machine

Fig. 7

Drive module of the stand for testing sheath slippage in kernmantle ropes: 1 – Kevlar string I, 2 – string I reel, 3 – Kevlar string II, 4 – string II roller, 5 – string II tensioner, V – traverse speed of the Zwick testing machine
Drive module of the stand for testing sheath slippage in kernmantle ropes: 1 – Kevlar string I, 2 – string I reel, 3 – Kevlar string II, 4 – string II roller, 5 – string II tensioner, V – traverse speed of the Zwick testing machine

Fig. 8

Speed of the test rope moving through the compression module over time
Speed of the test rope moving through the compression module over time

Fig. 9

Kernmantle ropes subjected to sheath slippage tests
Kernmantle ropes subjected to sheath slippage tests

Fig. 10

Sample results of kernmantle rope sheath slippage tests: A – negative displacement, B – positive displacement
Sample results of kernmantle rope sheath slippage tests: A – negative displacement, B – positive displacement

Fig. 11

Results of kernmantle rope sheath slippage tests
Results of kernmantle rope sheath slippage tests

Kernmantle ropes subjected to sheath slippage tests and the results obtained

Rope symbol Rope type Rope diameter d [mm] Mean sheath slippage SSm [mm] Standard deviation SD [mm] Coefficient of variation for SD Wsx [%]
A Titan 11 11 1.4 0.96177 68.7
B Iceline 8.1 −0.78 0.30332 38.9
C Aqualine 9.5 10.6 0.41833 3.9
D Pro-Static 10 1.5 0.61237 40.8
E Wall master VI 10.5 −1.06 0.43932 41.4
F Apollo II 11 −0.66 0.20736 31.4
G Performance Static 12 7.5 1.11803 14.9
H Pes 12-K-24 12 5.1 1.20623 23.7
I Pa-200-12-K 24x2 12 10.1 1.48155 14.7
J Tendon 11 −2.66 0.4219 15.9
K Baobab Uni Core 13.5 1.34 0.37815 28.2
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