PSI - Issue 48

Haris Nubli et al. / Procedia Structural Integrity 48 (2023) 73–80 Nubli et al. / Structural Integrity Procedia 00 (2023) 000 – 000

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 Carbon steel, commonly used in ship hull structures, is susceptible to the ductile-to-brittle transition temperature (DBTT) phenomenon. To mitigate this, higher-strength steel grades (AH, DH, EH, and FH) are recommended for LNG-carrying ships, governed by the IGC code.  Steels exhibit a hardening effect at sub-zero temperatures, resulting in increased yield and ultimate tensile strengths. Tensile tests on DH36 steel have demonstrated significant enhancements in these properties at cryogenic temperatures.  The influence of strain rate on the behavior of steel at low temperatures should be considered, as it affects yield and ultimate tensile strengths. Dynamic loading scenarios, such as impact tests, can reveal the strain rate hardening effect.  Slowing down the progression of fractures in materials is essential to prevent sudden failures. The Charpy V notch test is a valuable method for assessing the energy absorption capability of materials and determining their Ductile-to-Brittle Transition Temperature (DBTT).  Correlation analysis, such as the Kendall rank correlation, can provide insights into the relationships between input and output variables. In the case of DH36 steel, temperature, and strain rate show significant associations with ultimate tensile strength, while fracture strain exhibits a modest correlation with specimen thickness. To ensure the safety and reliability of LNG-carrying ships, a holistic approach encompassing risk analysis, material selection, and structural design is necessary. Incorporating the findings from this study into the preliminary design phase can help address the challenges posed by cryogenic temperatures and enhance the overall performance and integrity of LNG-carrying ships. 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