Kink Formation Properties and other Mechanical Characteristics of Oceanographic Strands and Wire Rope
1970
Vachon, William A.
Prepared in cooperation with Massachusetts Inst. of Tech., Cambridge. Charles Stark Draper Lab. Div., Rept. no. E-2497.
Show more [+] Less [-]Tests were conducted in order to measure the mechanical characteristics of a representative sampling of 1/4-inch diameter to 5/16-inch diameter oceanographic strands and wire ropes. Single-strand and three-strand wire rope were the only samples evaluated. The main purpose of the work was to compare the kink-formation properties, including both opening and tightening kinks, of each mooring line. In addition such mechanical characteristics as the torsional and linear spring constants and the degree of torque balance of given samples was measured. It was found that the 3 x 19 wire ropes exhibited a markedly lower torsional spring constant than single strand samples. Therefore, they can absorb considerably more turns before developing excessive torque. The presence of high torque in a sample will, however, considerably reduce the ultimate breaking strength in tension. It was further found that at a tension of 4.5 pounds the average torque level required to produce kinks in samples is within a factor of two of each other. The effects of the type of termination on the kink formation properties was measured. An open swaged socket and pin termination was found desirable in that it exhibited a torque level approximately twice that of large eye swaged terminations at the time of kink formation.
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