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External Abrasion resistance
External Abrasion resistance
Published On:
Jan 17,2018
EXTERNAL ABRASION RESISTANCE
External Abrasion resistance is the property of the rope which gives it the the ability to resist damage from abrasion due to rubbing on exterior surfaces is an important property. It depends upon:-
The fibre material
Wet or dry conditions
Finish on the fibre
The rope construction
Nature of the abrasive surface
Tension in the rope
Pressure on the abrasive surface
Speed of sliding over the surface
There is no standard for quantifying the abrasion resistance. Some generalisations can provide guidance:-
Polyester especially if treated with a good marine finish resists abrasion well.
Nylon is good or dry, poor wet, unless treated with a marine finish which provides improvement.
Aramid is a good performer, wet or dry, but lubricants and marine finishes give better performance.
HMPE is very abrasion and cut resistant but due to low melting point it can give poor performance if the combination of pressure and speed creates heat.
Polypropylene is fair to good depending on type and filament size.low melting point is a disadvantage. Blends with polyester perform much better.
LCP has a very good abrasion resistance.
Manila is fair but degrades with age.
Surface yarns and strands should approximately align with the axis of the rope.
FRICTION
The coefficient of friction between ropes and other surfaces is an important consideration in many applications. Frictional heat can cause fibres with low melting points to melt which can lubricate the friction surface reduce the coefficient to near zero and create a dangerous situation. Friction is also essential to make a splice work. Friction coefficients are variable difficulty to quantify and are usually stated as a range the variable are:-
fibre material
surface material
surface conditions
finish on the rope fibre
pressure against a surface
wet or dry-friction coefficient usually increases if the rope is wet.
static or dynamic.
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