表層超細粒鋼板のアレスト性能簡易評価法(その2) : NRL落重試験によるアレスト性能評価基準

概要

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SUF (Surface layers with Ultra-Fine grained microstructure) steel plate as higher crack arrestor has been developed and actually applied to important hull structural members in order to improve structural integrity for brittle fracture. In this paper, simplified arrestability evaluation specification by NRL drop weight test is examined on the basis of the arrestability estimate equation of the SUF steel plate. In addition, actual application results of the higher crack arrestor in the NK-classed vessels are also reported. Then this paper comes to the following conclusions: (1) Crack arrestability of the SUF steel plate is assessable by surface layer's NDT or No-Break temperature by NRL drop weight test. (2) Arrestability evaluation specification by NRL drop weight test is applicable as an alternative specification of standard ESSO or Double-Tension test. (3) Higher crack arrestor is applied to sheer strake of various types of NK-classed vessels.
社団法人日本船舶海洋工学会の論文
2003-08-31