マグロ延縄用ナイロンテグスの疲労特性

概要

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The fatigue phenomena of nylon filaments which have recently been used as fishing gear material for tuna long-line fishing have been investigated. Fatigue tests were carried out with two nylon filaments (No. 150 monofilament and No. 50×3-ply filament). Results show that there is a great difference in fatigue behavior between the two nylons. Monofilament is found to have high resistance to tension cycling fatigue. In addition the measurement of the residual strength after 104 cycles of fatigue testing at a higher loading level (S/T0=75%) shows no strength loss but rather an increase (5 to 10%). In 3-ply filament, however, a decrease in fatigue life and a marked loss of residual strength after fatigue testing (12 to 27%) are observed. As a result, it can be concluded that the fatigue behavior of nylon filaments depends heavily on the construction of the filaments (number of filaments and twist). In 3-ply filament, fiber-fiber interactions and the twist of filament have a greater influence on the decrease of its fatigue life and the residual strength loss.
日本水産學會の論文