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<p>Hot-rolled 5083-O aluminum alloy has emerged as a strong candidate for use in storage tanks for liquefied hydrogen (LH₂) marine transport, owing to its performance under extreme cryogenic conditions. This study aims to investigate the micromechanisms and critical conditions for the formation of split cracks in 5083-O aluminum alloy at cryogenic temperatures. Tensile tests on smooth and notched round bar specimens and L–T direction C(T) tests were conducted at 293&#xa0;K, 223&#xa0;K, 123&#xa0;K, and 4&#xa0;K, while an S–L direction C(T) test was performed at 77&#xa0;K. The fracture locus at each temperature was obtained by combining the results of notched round bar tests with finite element (FE) analyses. The results showed that the fracture locus of 5083-O is temperature-independent. Among the round bar specimens, split cracks were observed only in those tested at 4&#xa0;K and in the R1 notched specimen at 123&#xa0;K. For the C(T) specimens, split cracks occurred only in the 4&#xa0;K tests. Furthermore, a three-stage model was established for the formation process of split cracks. To calibrate the model for 5083-O, FE analyses were conducted to determine the critical conditions for each stage at various temperatures. The results predicted by the developed model were compared with the C(T) test results at temperatures ranging from 123 to 293&#xa0;K.</p>

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Micromechanisms of split crack formation in aluminum alloy 5083-O plate under cryogenic temperatures

  • 期刊论文

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  • 发表日期：

    2026年6月15日

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  • Xixian Li,
  • Fuminori Yanagimoto,
  • Shohei Uranaka,
  • Tomoya Kawabata

摘要

Hot-rolled 5083-O aluminum alloy has emerged as a strong candidate for use in storage tanks for liquefied hydrogen (LH₂) marine transport, owing to its performance under extreme cryogenic conditions. This study aims to investigate the micromechanisms and critical conditions for the formation of split cracks in 5083-O aluminum alloy at cryogenic temperatures. Tensile tests on smooth and notched round bar specimens and L–T direction C(T) tests were conducted at 293 K, 223 K, 123 K, and 4 K, while an S–L direction C(T) test was performed at 77 K. The fracture locus at each temperature was obtained by combining the results of notched round bar tests with finite element (FE) analyses. The results showed that the fracture locus of 5083-O is temperature-independent. Among the round bar specimens, split cracks were observed only in those tested at 4 K and in the R1 notched specimen at 123 K. For the C(T) specimens, split cracks occurred only in the 4 K tests. Furthermore, a three-stage model was established for the formation process of split cracks. To calibrate the model for 5083-O, FE analyses were conducted to determine the critical conditions for each stage at various temperatures. The results predicted by the developed model were compared with the C(T) test results at temperatures ranging from 123 to 293 K.