On the Tucked-Strand's Slipping-off in Various Forms of Splices for Joining the Rope I : On Relation between the Strains for the Slipping-off and the Breaking Stress of the Original Rope

When the rope jointed by means of spliccing is brought into use, the tucked strand's "slipping-off" will often cause various accidents. So, the special Manila rope (8 mm in diameter) spliced in a different condition from ordinary one, was put to the hauling test, and both in the short-splice and eye-splice, the co-relation between the strains acting as the cause of slipping off and the breaking-stress of the rope used was examined, with the following results. (1) Provided that the rope was strained with gradual aggravation (stressing-velocity : 4.0~4.1cm/min), in case of short splice, when the rope was tucked at either end, and only once, the used rope was slipped-off at about 30% breaking stress of the fixed limit : while the tucking of it, once, at the both sides of the end, prevented it from being slipped-off, and in this case, 79% of the breaking stress of the fixed limit was necessitated to let it be broken. (2) In case of eye-splice, one-time tucking was enough to prevent it from being spliced off, the possibility of slipping-off was found to be less than in case of short-splice. (3) As the breaking stress necessary for the "slipping-off" is related to the stressing velocity and the Lay, cares should be taken not to put the laying-mesh into loosing state