Accession Number : ADA118911

Title :   Rotational Loading of Double-Braid Line Eye Splices.

Descriptive Note : Final rept.,


Personal Author(s) : Bitting,Kenneth R

PDF Url : ADA118911

Report Date : Jun 1982

Pagination or Media Count : 25

Abstract : Two different splicing methods for double-braid line have been tested to simulate a loading condition in which the eye of a line under tension is rotated around a bollard as might occur during a docking operation. The Blue Book splice method, used on double-braid line before 1976, is thought to have one leg of the eye that is significantly weaker than the other. The Red Book splice method, a revision of the Blue Book, is thought to eliminate the weakness of the Blue Book splice. The results of these tests shown that the strength of a line with the Red Book eye splice is not reduced when loaded in rotational loading; both legs of the splice are equal in strength. The weakness is one leg of the Blue Book splice is confirmed; it fails in rotational loading when the load in the standing part of the line reaches 62% of rated break strength (RBS). The Red Book splice is approximately 9.8% stronger than the Blue Book splice in straight-pull conditions (i.e., no rotation). Nylon 3-strand twisted line is included for comparison with double-braid line. Results indicate that one leg of the eye fails in rotational loading when the load in the line reaches 81% RBS because the tucks in the splice fail and the splice pulls apart freeing the end of the leg. (Author)

Descriptors :   *Cables, *Splices, *Docking, *Strength(Mechanics), Loads(Forces), Rotation, Nylon, Twist(Motion), Braids

Subject Categories : Machinery and Tools
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE