Płaczek Dominika, Maćkowiak Paweł, Boroński Dariusz
Faculty of Mechanical Engineering, Bydgoszcz University of Science and Technology, 85-796 Bydgoszcz, Poland.
Materials (Basel). 2023 Sep 18;16(18):6259. doi: 10.3390/ma16186259.
The study presents an analysis of S355J2+N steel and AA5083 aluminum alloy welded structural joints using explosion welded transition joints of reduced thickness. The transition joint thickness reduction significantly hinders the welding of the joints due to the risk of damage to the Al/steel interface as a result of the high temperatures during welding. In the previous article, the strength of the transition joint was analyzed but ship structures, apart from static loads, are subjected to many different cyclical loads. Welded structural joints are analyzed to determine the welding influence on the fatigue life and fracture type of the transition joints. The results of the fatigue tests show that the fatigue damage in the specimens occurs in the aluminum welded joint, and not in the explosively welded joint. The damage obtained was characteristic of cruciform welded joint specimens and both types of root and toe damage occurred. Based on the obtained results, fatigue curves for the joint were determined and compared to the fatigue curves for the AA5083 base material. The experimental fatigue curve was also compared with the design curve for welded aluminum structures from Eurocode. The conducted analysis showed the possibility of using Al/steel explosion welded transition joints of reduced thickness to transfer cyclical loads.
该研究对采用厚度减小的爆炸焊接过渡接头的S355J2+N钢和AA5083铝合金焊接结构接头进行了分析。过渡接头厚度减小由于焊接过程中高温导致铝/钢界面受损的风险而显著阻碍接头的焊接。在上一篇文章中，分析了过渡接头的强度，但船舶结构除承受静载荷外，还承受许多不同的循环载荷。对接焊接结构接头进行分析，以确定焊接对过渡接头疲劳寿命和断裂类型的影响。疲劳试验结果表明，试样中的疲劳损伤发生在铝焊接接头处，而非爆炸焊接接头处。所获得的损伤是十字形焊接接头试样的特征，并且发生了根部和焊趾两种类型的损伤。基于所获得的结果，确定了接头的疲劳曲线，并与AA5083母材的疲劳曲线进行了比较。实验疲劳曲线还与欧洲规范中焊接铝结构的设计曲线进行了比较。所进行的分析表明，使用厚度减小的铝/钢爆炸焊接过渡接头来传递循环载荷是可能的。
