ワイヤロープの引張り疲労強度と繰返し応力-歪応答

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The cyclic stress-strain response and the fatigue property of spiral ropes under constant and variable amplitude axial loadings were investigated. The effects of a construction of wire rope and sea water environment on pulsating tension fatigue strength were also examined. Pulsating tensile load fatigue tests of l×7 wire ropes of 7 mm in diameter were carried out by changing stress ratio. An analysis of test results showed that the zero-to-tension fatigue strength at 4×l0^5 to 2×l0^6 cycles is about 30% of breaking load, and that the fatigue strength under any stress ratio can be predicted by an elliptic line drawn through the zero-to-te.nsion fatigue strength on the ordinate of stress amplitude and the ultimate strength on the abscissa of mean stress. Though the cyclic creep phenomena were observed, the axial strain ranges were kept nearly constant in each stress level. Then, the cyclic stress-strain relations were almost independent on both of stress ratio and stress history. Pulsating tensile load fatigue tests were also carried out in air and in sea water environments on a l37 wire rope of 20 mm in diameter consisting of 37 galvanized steel wires, showing that the fatigue strength in air is lower than that of l7 wire rope in air. Furthermore, it was shown that the sea water environment operates not only detrimental corrosive effect, but also beneficial effect upon the fatigue life due to decrease in the internal wear among wires. The results of random and p-distribution block loadings fatigue tests in air on l7 wire ropes showed a valid applicability of linear cumulative damage hypothesis to the estlmation of fatigue life for engineering purpose.
社団法人日本船舶海洋工学会の論文

ワイヤロープの引張り疲労強度と繰返し応力-歪応答

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