Rotational Loading of Double-Braid Line Eye Splices.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1982
- Accession Number
- ADA118911
Entities
People
- Kenneth R. Bitting
Organizations
- United States Coast Guard Research & Development Center