Design of Steel Cables. Wes Chappell Barrett Blackburn Kelly de Montbrun. Design Strategy. as a response to the high failure rate of chain links or solid steel bars used in mining.
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Kelly de Montbrun
Individual wires are first twisted into a strand, then six strands are twisted around a core which is used to cushion off stress forces when bending the rope.
The core can be made from steel or a natural fiber core consisting of hemp, sisal, manila, henequen, or jute and is used to cushion off the stress forces when bending the cable.
Contains a total of 21 wires; in smaller diameters, it is very flexible.
Contains 49 wires, allowing for abrasion resistance and flexibility through a large range of diameters.
Contains 133, allowing for increased flexibility along a range of diameters.
Contains 343 wires giving this cable extraordinary flexibility.
Elevator Wire Rope
19x7 Construction (1-6) WC, preformed, extra improved plow steel.
8x19 (Seale) Traction Steel with Natural Fiber Core.
Black Powder Coated Galvanized Aircraft Cable
Fewer wires=less flexible
Describes the way the strands are laid to form the rope.
Lay alternates between Ordinary and Lang’s Lays
Lang's laid rope is able to flex over sheaves more easily (with less damage) but it has the disadvantage of having a high torque tendency (it tends to untwist when tension load is applied) compared with ordinary laid rope. Untwisting can be dangerous with a steel-cored rope: load is shed from the strands and may cause the core to fail as it becomes higher loaded.
Cable flexibility depends on the number of wires in the cable (more wires=more flexible) and the diameter of the wires (thinner wire=more flexible)
The flexibility of the cable is important in cables used in machinery such as cranes and elevators as well as transportation uses (in cable cars, cable railways, and aerial lifts).
Cable flexibility is less important for cables used in suspension bridges.
tools to create the loop
Terminates two wire rope ends together
or terminates one wire rope end to something else.
Used when a fitting needs to be replace frequently.
Creates a high strength permanent termination.
May be used to secure the loose ends of the cable when forming a loop
Wire ropes are labeled based on a coding system that describes the number of strands in the rope, number of wires in the strand, the material in the core, and the lays of the rope.
i.e. 6*19 FC RH OL FSWR