合成繊維索の摩耗特性について

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Fiber ropes have recently been drawing attention as alternative materials for mooring lines or towing hawsers. The advantage of the fiber ropes is that they are lighter in weight than the conventional steel chains or the wire ropes. They also have better characteristics in the corrosion resistance and the flexibility. It is known, however, that most of the breaking of fiber ropes occurred at the points where they rub against something such as fairleaders, bollard or bitt. Therefore in order to use the fiber ropes for mooring lines or hawsers, the fatigue strength and the abrasion characteristics should be fully examined. In this paper the effect of abrasion on the decrease of the strength of fiber ropes is investigated experimentally. The residual strength of model ropes were measured after they were rubbed against a rotating steel drum for certain periods. 8 strand ropes made of nylon were used and 5 different amount of tensions were imposed on the ropes. From the study the following conclusions were obtained. (1) tension vs residual strength The residual strength decreases in proportion to the tension when the number of abrasion is constant. (2) number of abrasion vs residual strength The residual strength decreases in proportion to the logarithm of the number of abrasion when the tension is constant. From these results it can be said that the effect of tensions on the decrease of the residual strength of fiber ropes is much larger than that of the number of abrasion. Therefore a sufficient safety factor should be taken into account for the tension acting on the fiber ropes.
社団法人日本航海学会の論文
1986-09-25

合成繊維索の摩耗特性について

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