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The brochure might help you identify your own wire rope problem, or, even better, help you to prevent steel wire rope problems in the fi rst place.

Three adjacent strands with fatigue breaks followed by one without indicate uneven load sharing or cabs pulled-in strand. Therefore sometimes an increase in rope diameter over time might be an indication that the rope is corroding internally. Obviously the crack propagated concentric to its point of initiation.

One reason, of course, is just human curiosity. Corroded wire surfaces will form fatigue cracks much faster than protected surfaces.

Once the rate of diameter reduction slows down, fatigue breaks will appear Fig. A third reason is money.

This kind of failure can often be seen if wires are subjected to local bending and compression. Please note that the rope does not show any fatigue breaks. The work cmiaf a wire rope detective resembles very much that of Sherlock Holmes: High transverse loading initially caused severe plastic wear.


Dados Técnicos – defeitos em cabos de a?o – Dados Técnicos Guindastes

The distribution of bending fatigue wire breaks is typically random. The fracture surface is fairly smooth in appearance. Roland Verreet and Dr. Sherlock Holmes will inspect the room with his magnifying glass, collect a limited number of seemingly trivial and unrelated details and then present a surprising, but undisputable answer to all these questions.

This can be done e. A Langs lay rope with a great amount of uniform mechanical wear. A fatigue crack starting at the point of contact with a sheave. With increasing wear, however, the bearing surface of the wire rope will increase. The highly orientated micro struc ture of drawn high tensile wire becomes apparent in the corroded state. The fatigue crack radiates out from the origin as a series of concentric rings termed rest lines, beach lines or striations.

Wire Rope Forensics operating in a marine environment should be galvanized and well lubricated. The bearing surface on sheaves and drums has increased due to the mechanical wear. Finally the wire failed in shear. Corrosion is the reaction of metal with oxygen.

If high local stresses help propagate these cracks, we call this mecha – nism stress corrosion. This locally damaged wire fi nally failed in tensile overload.

Rope bending fatigue is caused by running over sheaves or on and off single layer drums.

Dados Técnicos – defeitos em cabos de a?o

Roland Verreet has spent more than thirty years in steel wire rope research and development and has investigated hundreds of rope accidents. Wire rope endurance can also be increased by increasing the sheave or drum diameter or by reducing the line pull. But you do not always need a wire rope failure: The cracks became visible after destroying the strand in a pull test. Plastic wear is the deformation and displacement of material without or with only little material loss.


Static ropes suspension ropes or rope sections lying over a saddle or an equalizer sheave are more likely to corrode than running ropes.

Parte 1 de 3 Dipl. The diameter reduction at the fracture is clearly visible. Mechanical wear must not be confused with plastic wear. Ciimaf cracks initiate from all around the circumference. The remaining wires were then no longer able to support the load, leading to tensile overload failures of these remaining wires.

Regular lay rope with a great amount of uniform mechanical wear.

Figures 5, 6 and 7 show examples of plastic wear. Cup and cone tensile failure at a crossover point. The authors would like give special thanks to Klaus Turotzi. The amount of corroded metal is a function of the surface which ds can attack.

It then proceeds with increasing number of bends, fi nally creating a fracture which is perpendicular to the wire axis.