My discussion topic is on ropes; that is the causes of rope failure and what can be done to reduce the problem. Many are the times that you find that just after a small operation on the hoist system, the steel rope is significantly damaged. Among other causes, fatigue is a major cause of rope failure. Fatigue causes damage when there is high nominal stress concentrated on a particular point. The surface quality of the steel wire also significantly leads to wearing out of the ropes. There are internal defects which also cause the ropes to get damaged quickly. An example of such defect is slag inclusions and also air voids which are seen in both new and old ropes by close observation with a metallographic microscope.
Looking on what can be done to reduce the rope failure, we start with the last cause which can be reduced by ensuring there are minimal manufacturing defaults. Overloading operations should also be strictly prohibited since most failure comes as a result of fatigue. Even when there is another reason for the fault may be a surface that is not of high quality, reducing the fatigue would significantly reduce the wearing out of the ropes. Also, high speed should be highly prohibited and should only be in accordance with the ability of the hoisting machine ( Peng, Chang, Sun, Zhu, Gong, Zou & Mi, 2018) .
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According to research, it was found that the wearing out is not necessarily caused by fatigue as a major cause, there were other causes which is mixing wires of different strengths, that is high and low strength. The analysis of the mechanical test also found that the wearing out is also led by the manufacturing of different grade ropes other than one declared by the manufacturer ("Failure analysis of hoisting steel wire rope - ScienceDirect," n.d.)
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References
Failure analysis of hoisting steel wire rope - ScienceDirect. (n.d.). Retrieved June 27, 2019, from https://www.sciencedirect.com/science/article/abs/pii/S1350630714001897
Peng, Y. X., Chang, X. D., Sun, S. S., Zhu, Z. C., Gong, X. S., Zou, S. Y., ... & Mi, Z. T. (2018). The friction and wear properties of steel wire rope sliding against itself under impact load. Wear , 400 , 194-206.
