Fracture mechanics study on the reliability of sea transportation structures

由于大型集装箱船等大型海上运输结构采用大截面钢板，防止脆性断裂已成为一项紧迫的任务。在本研究中，对快速扩展脆性裂纹进行了实验和数值分析。阐明了脆性裂纹扩展和止裂行为随裂纹长度变化的原因。建立了具有材料和应力非均质条件下焊缝裂纹扩展行为的数值模型。这些结果有望为船舶结构脆性裂纹扩展的预防和控制技术的发展做出贡献。

Prevention of brittle fracture in large-scale sea transportation structures, such as mega-container ships, has been an urgent task because heavy-section steel plates are used in these structures. In the present study, experimental as well as numerical analyses were made for fast propagating brittle cracks. Reason to the discrepancy of the brittle crack propagation and arrest behaviors with crack length was clarified. Also, a numerical model was developed for analyzing crack propagation behaviors in welds with material and stress heterogeneities. These results are expected to contribute to the technology development for preventing and controlling brittle crack propagation in ship structures.