Experimental Study on Wear Coefficient of Mooring Chain for Floating Offshore Structures

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  • 海洋浮体構造物係留鎖の摩耗係数に関する実験的検討
  • -Second Report: Elucidation of Wear Characteristics and Proposal of Wear Coefficient through Statistical Analysis-
  • －第二報 摩耗特性の解明と統計処理による摩耗係数指標の提案－

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<p>　In pursuit of a carbon-neutral society by the year 2050, floating offshore wind turbines (FOWTs) garner heightened expectations. Mooring chains are commonly employed for the station-keeping of FOWTs; however, long-term use can cause failure attributable to wear and corrosion. Among these, interlink wear caused by floating body motion can be estimated by dynamic analysis, but it is important to accurately determine the wear characteristics in order to properly estimate the wear allowance. In this paper, an additional 11 wear tests were conducted following the previously reported by using the heat-treated surfaces under fully submerged conditions to investigate the effect on the wear amount by the characteristics of the wear test machine such as sliding range and sliding direction. Since these were found to have little effect on the wear amount, a statistical reassessment of the wear coefficient was performed including the previously reported results. As a result, it was found that the obtained wear coefficients conform to a log-normal distribution, and a formula for wear estimation was proposed considering the observed variations.</p>

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