Overload Effects on Fatigue Damage of Wire-Rope Pendants

Kies, J. A.; Seibert, E. R.; Smith, H. L.; O'Hara, George J.; Cullen, W.H.; Ascher, Harold; Stonesifer, F. R.; Bachman, J. L.

doi:10.1115/1.3443532

Cited by 2 publications

(3 citation statements)

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“…The results of Stonsifer and Smith and colleagues [1][2][3] are very interesting and raise questions about the validity of using visible wire breaks as a discard criterion in tensile loading conditions. There are two major reasons for this.…”

Section: Discussionmentioning

confidence: 99%

“…A number of researchers have conducted experimental work in order to correlate the number of wire breaks and the static breaking load with the percentage of expected life completed at various points throughout the life of the rope. Stonesifer, Kies and associates [1][2][3] tested a number of different ropes. In each case two nominally identical samples were tested in parallel and stopped at different various fractions of the expected rope endurance: one rope was then stripped down to count wire breaks and the other was tested to measure the residual static strength.…”

Section: Correlation Of Wire Breaks and Strength With Fatigue Exposurementioning

confidence: 99%

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Wire failures in ropes and their influence on local wire strain behaviour in tension-tension fatigue

Evans

Ridge

Chaplin

2001

The Journal of Strain Analysis for Engineering Design

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Experimental work using multiple strain gauges has investigated the take-up of load by a wire at either side of a break and how this is affected by fatigue cycling. In addition the effect of a wire break on other wires at the same cross-section has been investigated. The results indicate that a significant amount of slippage can occur for up to 20 000 cycles after a wire has broken, causing the load transfer length to change from two strand lay lengths to around three. The transfer length was found to be much lower for Lang's lay rope than ordinary lay and this was attributed to the greater interlayer forces in Lang's lay ropes. With respect to the effect of wire breaks on other wires at the same cross-section it was found that the primary increase is in the strains in wires in the same strand, although wire strains in adjacent strands also increase to some extent. Wires on the opposite side of the rope construction were found to show a decrease in surface strain after the break which may be attributed to local bending effects.

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Section: Discussionmentioning

confidence: 99%

Section: Correlation Of Wire Breaks and Strength With Fatigue Exposurementioning

confidence: 99%

Wire failures in ropes and their influence on local wire strain behaviour in tension-tension fatigue

Evans

Ridge

Chaplin

2001

The Journal of Strain Analysis for Engineering Design

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“…Kies [5] and later Smith et al [6] investigated the effect of overload on rope fatigue behaviour in T-T conditions. They were initially inspired by the phenomenon of improved fatigue life of overloaded metal specimens caused by the crack closure mechanism (i.e.…”

Section: Effect Of Overload On Tensile Fatigue Lifementioning

confidence: 99%

Wire strain variations in normal and overloaded ropes in tension-tension fatigue and their effect on endurance

Evans

Ridge

Chaplin

2001

The Journal of Strain Analysis for Engineering Design

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This paper investigates wire strain variations in tension-tension fatigue for two six-strand rope constructions under normal and overloaded conditions. It has been found that for ropes in tension there is a considerable variation in wire strains both on different wires at the same cross-section and to a marginally lesser extent along the length of the same wire. It has also been found that a Lang's lay rope has a wider variation of strains than the identical ordinary lay rope. Load cycling has been found to reduce the distribution slightly for an initial period, around 8 per cent of the rope's life (for the load range used), after which the variations in wire strains do not change significantly for the rest of the life of the rope. Tests involving initial overload have shown a considerable reduction in wire strain variation. By way of an example for an ordinary lay rope an initial overload caused the wire strain standard deviation to decrease from 22 per cent of mean to 11 per cent of mean and was accompanied by an increase in rope endurance by a factor of 2.4. A statistical model has been used to illustrate the influence of strain range distribution on the fatigue endurance of a rope using a Gaussian probability distribution. It is suggested that wire strain distribution (measured by standard deviation as a percentage of mean) provides a good indicator of rope manufacturing quality.

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Overload Effects on Fatigue Damage of Wire-Rope Pendants

Cited by 2 publications

References 0 publications

Wire failures in ropes and their influence on local wire strain behaviour in tension-tension fatigue

Wire failures in ropes and their influence on local wire strain behaviour in tension-tension fatigue

Wire strain variations in normal and overloaded ropes in tension-tension fatigue and their effect on endurance

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