表層超細粒鋼板のアレスト性能簡易評価法(その1) : アレスト性能推定式の確立

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Steel plates with ultrafine-grained surface layers (SUF steel) have been developed by applying an advanced thermo-mechanical control process. Since SUF steel possesses high crack-arrest fracture toughness against brittle fracture (arrestability), it has already been applied to important components of large structures such as large ships in order to improve structural integrity. In the present report, it is noted that the required Kca value to arrest propagating long cracks should be more than 6000N/mm^<1.5> at a design temperature, and the temperature at which Kca value is more than 60000N/mm^<1.5> (TKca6000) can be shifted up to 40℃ due to plastic strain induced in the steel plate in cases of ship-accidents. Kca values are normally evaluated by the temperature-gradient-type ESSO test. However, the ESSO test requires both large-scale fracture test specimens and large-scale fracture testing machine. Therefore, it is demanded to estimate TKca6000 values obtained by the ESSO test using simplified evaluation methods with only small-scale specimens. Investigating a correlation between ESSO test results (as large scale crack-arrest test) and NRL drop weight test results (as small scale crack-arrest test), it is suggested that TKca6000 can be estimate using the NDT temperature of the NRL drop weight test in both the surface layer section and mid-section of steel plate, together with plate thickness, through a proposed new equation.
社団法人日本船舶海洋工学会の論文
2003-08-31

表層超細粒鋼板のアレスト性能簡易評価法(その1) : アレスト性能推定式の確立

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