Abstract
Synthetic fiber ropes are widely used in the maritime industry, with applications from sailboat rigging to offshore platform mooring lines, thanks to their numerous qualities compared to steel cables: light weight, good specific mechanical properties and excellent marine resistance. A key feature of these ropes is their sensitivity to loading history, as this affects subsequent performance. In the present work the influence of the maximum bedding-in load level and the loading path were studied at the different rope component scales (filament, yarn and braided rope), in order to develop an optimal bedding-in procedure for braided ropes. The load levels were: 10%, 30% and 50% of the tensile break load of the sample. From the results obtained, the influence of braid construction and material have been studied, and an efficient bedding-in process has been defined. It was shown that the main parameter is the maximum load level, the loading path is not important. The load required to bed in HMPE ropes is closely related to changes in the braid angle under load.
Highlights
Fiber ropes have been used for thousands of years, thanks to their excellent tensile strength, environmental resistance and light weight
These figures show the strong influence of bedding-in on the subsequent mechanical behavior of the braided rope
According to the third assumption, this plastic strain εp measured at the end of the recovery step is the sum of a geometrical plastic strain εpg and a material plastic strain εpm: εp = εpg + εpm The geometrical plastic strain εpg is due to the reorganization of fiber sub-scales for the case of rope, yarn and filament
Summary
Fiber ropes have been used for thousands of years, thanks to their excellent tensile strength, environmental resistance and light weight Synthetic materials such as polyester, polyamide, aramid, and polyethylene are newcomers in the history of fiber ropes, and have extended the range of possible applications. To understand the consequences of the bedding-in protocol on the rope deformation mechanisms, some researchers have focused on the influence of rope construction on the mechanical behavior (Hoppe, 1991; Leech and Hearle, 1993; Raoof and Hobbs, 1988), and others on the role of loading history (Casey et al, 2000; Davies et al, 2002; Del Vecchio, 1992). These two points concerning the construction and the history effect need further investigation
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