PSI - Issue 18

Benjamin Möller et al. / Procedia Structural Integrity 18 (2019) 556–569 Author name / Structural Integrity Procedia 00 (2019) 000–000

566

11

Fig. 12. Fatigue test results under CAL and VAL as well as evaluated Wöhler and Gaßner curves of laser beam welded adapters V2

2.7. Fatigue test results under constant amplitude loading and corrosive environment Ships and maritime structures in general are subjected to corrosive environments. Even though metallic structures are coated, due to damage of the coating, metallic materials and welds are exposed to the ambient medium. Therefore, fatigue testing under CAL and a corrosive environment, sodium chloride solution of 5 % in this case, has been performed on controlled welded lap joints with single weld seams and adapters V2. A housing made of stainless steel was designed and manufactured in order to encapsulate the specimen (and clamping) from the surroundings. According to DIN EN ISO 9227 (2017), in parallel to the constant amplitude loading, the sodium chloride solution is sprayed for 5 minutes horizontally into the housing, follow by 20 minutes residence time without spraying. The procedure is repeated until failure of the specimen.

Fig. 13. Fatigue test results under CAL and corrosive environment as well as evaluated Wöhler curves of laser beam welded lap joints