Abstract
As the development of the polar region continues to increase, the fatigue properties of structures at low temperature are increasingly receiving researcher attention. This study aimed to investigate the fatigue properties of T-welded and cruciform welded joints at −60 °C. Logarithmic S–N curves based on the hot-spot stress of the T-welded and cruciform welded joints at 50% and 95% confidence levels were obtained at −60 °C. The test results showed that the fatigue properties of T-welded joints were almost 2–7% better than those of the cruciform welded joints at −60 °C. Factors that affected the fatigue properties of welded joints, such as the stress concentration factor, microstructure, Vickers hardness profiles, and fractography, were also studied and the test results showed that the fatigue properties of cruciform welded joints at −60 °C were 57.215% better than at room temperature.
Highlights
Fatigue is a common failure mode of ship structures [1]
Factors that affected the fatigue properties of welded joints, such as the stress concentration factor, microstructure, Vickers hardness profiles, and fractography, were studied and the test results showed that the fatigue properties of cruciform welded joints at −60 ◦ C were 57.215% better than at room temperature
DH36 steel is often used in polar ships at low temperature
Summary
Fatigue is a common failure mode of ship structures [1]. The widespread use of high-strength steel in recent years has directed the attention of researchers to the fatigue failure of ship structures.Fricke investigated the fatigue properties of two types of ship structure and observed that T-welded and cruciform welded joints are prone to fatigue resulting from high cyclic loads [2].T-welded and cruciform welded joints are commonly-used welded joints in polar ships. Fatigue is a common failure mode of ship structures [1]. The widespread use of high-strength steel in recent years has directed the attention of researchers to the fatigue failure of ship structures. Fricke investigated the fatigue properties of two types of ship structure and observed that T-welded and cruciform welded joints are prone to fatigue resulting from high cyclic loads [2]. T-welded and cruciform welded joints are commonly-used welded joints in polar ships. Cruciform welded joints can simulate the intersections between longitudinal and transverse web frames in ships, and T-welded joints can simulate the intersections of longitudinal and transverse bulkheads in ships [3]. The fatigue properties of welded components have been studied by many researchers [4,5]. Most of these studies evaluated the fatigue properties of these welded components at room temperature, and the parameters obtained at room temperature are not appropriate for fatigue evaluation at low temperature [5]
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