Torsional failure of a wire rope mooring line during installation in deep water

Chaplin, C. R.

doi:10.1016/b978-0-08-043959-4.50008-0

Cited by 9 publications

(11 citation statements)

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“…Usabiaga and Pagalday 8 proposed a theoretical calculation method for simulating wire ropes subjected to tension and torsion loads under the assumption that the wire rope is not lubricated and there is no relative sliding between adjacent wires. Chaplin 9 studied the different torque–tension characteristics of marine mooring chains and wire ropes, sensitivities of different components to torsion, and interactions between chains and wire ropes. A mechanism was proposed to explain the causes of failure of the mooring wire ropes in deep waters due to excessive torsional deformation.…”

Section: Introductionmentioning

confidence: 99%

Distributions of stress and deformation in a braided wire rope subjected to torsional loading

Song

Wang

Cui

et al. 2018

The Journal of Strain Analysis for Engineering Design

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Braided wire rope is vital for stringing conductors with tension in overhead transmission lines. Its structure and characteristics determine the safety and reliability of the stringing construction. Torque generated in this process can cause an uneven stress distribution, ultimately causing the wire rope to fail. This study analyzes distributions of stress and deformation in braided wire rope subjected to torsional loading. A geometric model for YS9-8 3 19 braided wire rope was established, and finite element analysis was performed on the model in different twisting directions. The simulation results show that the wires in the strands have the tendency to be screwed tightly and are in a stretched state when the lay direction of the strand coincides with its torsion direction. However, when the lay and torsion directions are opposite, the wires in the strands tend to unwind and are in a compressed state. At the same torsional angle, different torques can be generated at a particular cross-section along different twisting directions. This shows that braided wire rope has better anti-twist characteristics when twisted clockwise compared to when twisted anticlockwise. Finally, a torsion test was conducted on the braided wire rope. The results show that the change in the torque curve with respect to the torsional angle is in good agreement with the simulation results.

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Section: Introductionmentioning

confidence: 99%

Distributions of stress and deformation in a braided wire rope subjected to torsional loading

Song

Wang

Cui

et al. 2018

The Journal of Strain Analysis for Engineering Design

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“…The tension±torque relationship was very nearly linear in both the loading and the unloading phases over the full range of loads applied. Based on a best-fit straight line through the data, the torque factors were found using the relationship given in equation (2). The torque factor for this particular construction lay between 6.45 and 6.54 per cent, agreeing quite closely with the theoretical prediction of 6.64 per cent and indeed with the handbook estimate of 7 per cent.…”

Section: Induced Torquementioning

confidence: 71%

Axial stiffness and torsional effects in a 76 mm wire rope: Experimental data and theoretical predictions

Kraincanic

Hobbs

1999

The Journal of Strain Analysis for Engineering Design

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Some recent tests on a 6 3 41 wire rope of 76 mm diameter are reported. A specimen 7 m long whose ends were prevented from rotating was used with axial loads ranging up to 1.4 MN. Axial stiffnesses were measured, both for large load ranges and for small load perturbations superimposed on larger mean loads. The torque generated in the rope by axial load was measured, as was the response of the axially preloaded rope to external torque applied at the mid-point of the rope. These experimental data are reported and compared with new theoretical predictions, and with other theoretical results and a range of manufacturers' rules. Some encouraging correlations have been found.

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“…Then, this last condition generates the torsion fatigue. The torsional oscillations are consequence of tensile load fluctuations [22], [23], [24], [25] as well as torsional oscillations conduce to fluctuations in the rope tensile load. When a rope is twisted the original construction is modified.…”

Section: Steel Wire Rope Birdcagingmentioning

confidence: 99%

Detection of birdcaging in steel wire rope of a hoisting winch system by analysis of load torque and stator current

Capolino

Fatemi

Sieg-Zieba

2009

2009 IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives

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Torsional failure of a wire rope mooring line during installation in deep water

Cited by 9 publications

References 0 publications

Distributions of stress and deformation in a braided wire rope subjected to torsional loading

Distributions of stress and deformation in a braided wire rope subjected to torsional loading

Axial stiffness and torsional effects in a 76 mm wire rope: Experimental data and theoretical predictions

Detection of birdcaging in steel wire rope of a hoisting winch system by analysis of load torque and stator current

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