縄の疲労に対する荷重振幅量の影響

概要

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The fatigue properties of tuna branch lines (polyester and nylon) subjected to cyclic loading were investigated with various load amplitude. The maximum load imposed in each cycle was kept at 80% of their breaking load in all cases, and the cyclic load amplitude were varied in the range of 5-80% load. The number of cycles to failure and some mechanical properties were measured, and the sample was subsequently examined in the scanning electron micrograph (SEM). It was observed that the fatigue life of the cord was remarkably influenced by the magnitude of the cyclic load amplitude. In the range of large load amplitude, fatigue breaks were seen to occur at very low cycles, whereas no breaks were obtained within 104 cycles in the range of small amplitude. SEM studies showed that the larger the cyclic load amplitude, the more the damage to the fiber.It was suggested that fatigue break of the cord was caused by the damage of the fiberdue to the mutual abrasion between each strand. Furthermore, it was shown that there was a close relation between cyclic load amplitude and strain amplitude in each cycle. It was recognized that the elongational properties of the cord against cyclic load affected its fatigue behaviour to a great extent.
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