Abstract
Stainless steel possesses outstanding advantages such as good corrosion resistance and long service life. Stainless steel is one of the primary materials used for sustainable structures, and welding is one of the main connection modes of stainless-steel bridges and other structures. Therefore, fatigue damage at welded joints deserves attention. The existing fatigue design codes of stainless-steel structures mainly adopt the design philosophy of structural steel. In order to comprehensively review the published fatigue test data of welded joints in stainless steel, in this paper, the fatigue test data of representative welded joints of stainless steel were summarized comprehensively and the S–N curves of six representative stainless-steel welded joints were obtained by statistical evaluation. The comparison of the fatigue strength from existing design codes and fatigue test data was performed, and the results showed that the fatigue strength of welded joints of stainless steel was higher than that of structural-steel welded joints. The flexibility of regression analysis with and without a fixed negative inverse slope was discussed based on the scatter index. It was found that the fatigue test data of stainless-steel welded joints are more consistent with the S–N curve regressed by a free negative inverse slope. In this paper, a design proposal for the fatigue strength of representative welded joints of stainless steel is presented based on the S–N curve regressed by the free negative inverse slope.
Highlights
Stainless steel has outstanding corrosion resistance, an elegant surface effect, and good mechanical properties
A design proposal for the fatigue strength of representative welded joints of stainless steel is presented based on the S–N curve regressed by the free negative inverse slope
The results indicated that the fatigue strength of stainless-steel welded joints was higher than that of the welded joints of structural steel existing in the fatigue design standard [11]
Summary
Stainless steel has outstanding corrosion resistance, an elegant surface effect, and good mechanical properties. The International Institute of Welding (IIW) fatigue recommendation [14] S–N curves were generally more suitable than those in Eurocode (EC) Parts 1–9 [15] They found that the type of stainless steel did not influence the fatigue strength of stainless-steel welded joints. The S–N curves obtained from the fatigue test data of stainless-steel welded joints were quite different from the S–N curves from the IIW fatigue design recommendation [14]. S–N curves for a hot-spot stress approach based on the fatigue test data of structural-steel and austenitic stainless-steel welded joints. The fatigue test data of the welded joints of stainless steel were summarized, and the S–N curve and the fatigue strength were obtained using a statistical analysis method. A design proposal for the fatigue strength of stainless-steel welded joints is presented
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