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<p>Aluminum components may enable weight reduction in the top deck structures of ship applications. To join aluminum structures to steel hulls, structural transition joints (TJs) are needed. In this study, the fatigue performance of explosion-cladded steel-to-aluminum TJs is studied. The studied TJs are manufactured using atmospheric explosion welding, combining mild ship steel with 1050 pure aluminum alloy and 5086 marine grade aluminum alloy. Quasistatic tensile and fatigue tests were performed for the specimens with the TJ adjoined with <i>t</i> = 5&#xa0;mm S355 and <i>t</i> = 6&#xa0;mm 5083 aluminum plates, including both fillet weld and fully penetrating K-butt weld configurations. The TJ was found to exceed the characteristic fatigue strength of 15&#xa0;MPa (slope parameter of <i>m</i> = 3.4). To avoid fatigue failures propagating in the transition region, it is recommended that the width of TJ metal be at least three times that of the thickness of adjoined transversal aluminum plate. In this configuration, aluminum welds become fatigue-critical from the weld root (fillet welds) or weld toe (fully/partially penetrated welds). With the given geometrical limitations, the trimetal TJs can be considered an effective method to connect steel and aluminum structures.</p>

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Fatigue performance of explosion-cladded steel-to-aluminum transition joints for marine applications

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月31日

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  • Kalle Lipiäinen,
  • Shahriar Afkhami,
  • Juho Havia,
  • Antti Ahola,
  • Masoud Moshtaghi,
  • Timo Björk

摘要

Aluminum components may enable weight reduction in the top deck structures of ship applications. To join aluminum structures to steel hulls, structural transition joints (TJs) are needed. In this study, the fatigue performance of explosion-cladded steel-to-aluminum TJs is studied. The studied TJs are manufactured using atmospheric explosion welding, combining mild ship steel with 1050 pure aluminum alloy and 5086 marine grade aluminum alloy. Quasistatic tensile and fatigue tests were performed for the specimens with the TJ adjoined with t = 5 mm S355 and t = 6 mm 5083 aluminum plates, including both fillet weld and fully penetrating K-butt weld configurations. The TJ was found to exceed the characteristic fatigue strength of 15 MPa (slope parameter of m = 3.4). To avoid fatigue failures propagating in the transition region, it is recommended that the width of TJ metal be at least three times that of the thickness of adjoined transversal aluminum plate. In this configuration, aluminum welds become fatigue-critical from the weld root (fillet welds) or weld toe (fully/partially penetrated welds). With the given geometrical limitations, the trimetal TJs can be considered an effective method to connect steel and aluminum structures.