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| The breaking strength of wire
rope can be increased in two ways: either by increasing the wire material
TENSILE STRENGTH or by increasing the rope's FILL FACTOR. |
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Tensile Strength
The wires of wire rope are made of high-carbon steel. These carbon steel
wires come in various grades. Wire ropes are usually made of Extra Improved
Plow Steel (EIPS) or Extra Extra Improved Plow Steel (EEIPS) which roughly
equivalents to a wire tensile strength of
1960N/mm
and 2160N/mm.
As one can see from the tables, the difference in the rope's breaking strengths
by increasing the material tensile strength is only about 10%. |
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Fill Factor
In order to further increase the breaking strength of wire rope one has
to increase the rope's fill factor.
The fill factor measures the metallic cross section of a rope and compares
this with the circumscribed area given by the rope diameter. Traditional
rope constructions 'fill' the rope diameter only up to about 58% with steel.
Python® and Compac® wire rope 'fill' the rope diameter up to 80%
with steel. That is an metallic increase of about 38% which results in a
similar increase in rope strength.
Two methods can be employed: Selecting a different rope CONSTRUCTION or
COMPACTING/DIE DRAWING the rope/strands.
Many high strength rope constructions use both methods at the same time. |
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| Fill Factor of different rope
constructions |
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