屋外暴露された合成繊維索の強度について

概要

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Many tests are necessary to estimate the strength of synthetic fiber rope. These tests for the rope exposed to outdoor condition are sunlight exposure test and exposure test to high and low temperature. And fatigue test and abrasion test are also necessary for using rope. We already carried out fatigue test and abrasion test. So in this research, we have carried out two kinds of test, sunlight exposure test in sea and high temperature exposure test for four weeks. And we propose the strength estimation equation of outdoor exposure rope. The results are as follows. 1. High temperature exposure test (1) Exposure to 70℃ for about one month has almost no effect on rope strength. (2) Rope strength is influenced by the present surrounding temperature, not by exposed past temperature. 2. Sunlight exposure test (1) The test condition that a rope is directly set on a float in sea and exposed to sunlight, rain and so on, is almost worst for rope strength. (2) The least strength of rope exposed sunlight can be estimated. 3. Strength estimation equation of outdoor exposure rope T={1-k_p・log(p+1)}{1-k_t・(t-20)^<0.8>} T : strength, p : exposure months t : surrounding temperature(℃) k_p, k_t : coefficients
社団法人日本航海学会の論文
1995-03-25