Tensile Strength Of Wire Rope

Rope strength is the approximate average for new rope tested under astm test method d 6268.

Tensile strength of wire rope.

Wire ropes are used to carry tensile loads and so the ultimate tensile strength of the rope is the most important property of a rope. 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. These tests are done by incrementally increasing the load that a rope is expected to carry until the rope breaks. These carbon steel wires come in various grades.

Nominal strength in metric tons. These wire ropes come in fiber core or iwrc variations with diameters ranging from to 1 1 3 and tensile strengths of 2 74 tons to 69 4 tons. The same standard requires a design factor of 5 0 for rotation resistant ropes. There are 3 typical definitions of tensile strength.

6x19 class wire ropes with 15 26 wires per strand. The mbf of starlift xtra is such. Wire rope manufacturers calculate a theoretical minimum breaking strength of ropes based on the grade of the wires and the metallic cross sectional area of the rope this will be reported as the. Nominal strength in kg.

Starlift xtra wire rope has one of the highest strength to diameter ratios on the market. A rope s tensile strength is the measure of a brand new rope s breaking point tested under strict laboratory controlled conditions. Rope diameter minimum breaking strength safe load weight in mm lb f kn lb f kn lb m ft kg m 1 4. 6x37 class wire ropes with 27 46 wires per strand.

Nominal strength in pounds. Recommended safe working load a 5 1 design factor lbs recommended safe working load a 5 1 design factor kg recommended safe working load a 3 5 1 design factor lbs. The wires of wire rope are made of high carbon steel. Asme b30 5 mobile and locomotive cranes requires a design factor of 3 5 for 6 strand hoist ropes.

The tensile strength is the load at which a new rope tested under laboratory conditions can be expected to break. Tensile strength is a measurement of the force required to pull something such as rope wire or a structural beam to the point where it breaks. To estimate the minimum tensile strength of a new rope reduce the approximate average by 20. All ropes of the same size grade and core offer somewhat similar minimum breaking force characteristics and weight per foot though they do differ depending on the construction type and materials used.

A simple wire rope strength chart can help you keep a close eye on wire rope strengths if find this to be an issue.