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to Technical
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The ability of wire rope to withstand
repeated bending work over sheaves and onto drums is also called the 'fatigue
resistance'. This term describes the ultimate rope life based on the maximum
mechanical fatigue resistance of the wire material used. This term does
NOT describe the ability to withstand mechanical damages nor the crush resistance
of a wire rope.
The fatigue resistance of a wire rope is not time- but cycle dependent. |
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Bending fatigue is the ability to
withstand repeated bending over sheaves and drums. The ability to withstand
a certain number of bending cycles is linked to equipment related factors,
such as
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diameter, shape, and groove dimensions of
sheaves and drums |
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the load the rope is subjected to |
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the fluctuation of highest to light loads |
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the line speed |
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rapid acceleration and braking forces |
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the rope construction |
| The larger the bending radii become, the higher
is the expected fatigue life. Large drums and sheaves will reduce
radial rope pressures. Reverse bends in the reeving system, especially
within short distances, will have a major negative impact on rope
life. |
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Rope Service
Life
Many years of monitoring rope performance in the field together with scientific
research at Universities and Technical Institutes have led to the recognition
that the number of outer strands in a rope is a very significant factor
influencing rope service life.
The number of outer strands determines the contact area between the rope
and sheave groove. If this area is increased the points of contact are multiplied
and abrasive wear of rope and sheave is reduced. At the same time lateral
notching stresses between strands and wires are reduced, resulting in increased
fatigue life.
Extensive test programs at the University of Stuttgart, Germany, have proven
conclusively that bending fatigue of wire rope improves with an increasing
number of outer strands.
Based on this research we have developed high performance wire rope with
8-, 9-, and 10 outer strands. |
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Rope diameter: 16 mm (5/8")
Tensile Strength: 1570 N/mm
Construction: Filler, IWRC
D/d Ratio: 25:1
Breaking Strength: 135.7 kN
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6x19 Filler
(6-strand)
8x19 Filler (8-strand)
9x19 Filler (9-strand) |
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| Research Institute
for Material Handling, Institute of Technology, Stuttgart, Germany |
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