고강도 극후물재의 용접부 불안정파괴 방지 기술
Prevent to unstable fracture of weld joints with high strength and ultra thick steel plate
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The recent increase in ship size and the expansion of oil and gas development in Arctic regions have intensified the demand for structural steels with high strength, excellent low-temperature toughness, and good weldability to prevent brittle fracture under service conditions. In large structures such as container ships, the ability to arrest brittle crack propagation has become a critical design requirement. Traditionally, structures fabricated with thick steel plates (approximately 80–100 mm) have been designed primarily to prevent crack initiation, particularly in welded joints. Crack arrest design has been adopted only in limited sectors, such as pipelines and nuclear power plants. Despite the welded joint being the most vulnerable region to brittle fracture, studies on its crack arrest toughness remain scarce. Recently, large-scale ESSO tests have been used for the first time to evaluate the crack arrest toughness of thick welded plates, highlighting the growing importance of verifying crack arrestability in real-scale conditions. Ensuring adequate fracture toughness of welded joints is essential for maintaining the structural integrity of large steel structures. In this study, brittle crack arrest design concepts were developed for the hatch side coaming of large container ships by applying arrest-weld, arrest-hole, and arrest-insert technologies, with the goal of enhancing crack arrestability in thick steel weldments.
Abstract
The recent increase in ship size and the expansion of oil and gas development in Arctic regions have intensified the demand for structural steels with high strength, excellent low-temperature toughness, and good weldability to prevent brittle fracture under service conditions. In large structures such as container ships, the ability to arrest brittle crack propagation has become a critical design requirement. Traditionally, structures fabricated with thick steel plates (approximately 80–100 mm) have been designed primarily to prevent crack initiation, particularly in welded joints. Crack arrest design has been adopted only in limited sectors, such as pipelines and nuclear power plants. Despite the welded joint being the most vulnerable region to brittle fracture, studies on its crack arrest toughness remain scarce. Recently, large-scale ESSO tests have been used for the first time to evaluate the crack arrest toughness of thick welded plates, highlighting the growing importance of verifying crack arrestability in real-scale conditions. Ensuring adequate fracture toughness of welded joints is essential for maintaining the structural integrity of large steel structures. In this study, brittle crack arrest design concepts were developed for the hatch side coaming of large container ships by applying arrest-weld, arrest-hole, and arrest-insert technologies, with the goal of enhancing crack arrestability in thick steel weldments.