期刊
MARINE STRUCTURES
卷 44, 期 -, 页码 288-310出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marstruc.2015.09.005
关键词
Butt joints; Fatigue strength; Effective notch stress; Local stress ratio; Master SN-curve; Residual stresses
资金
- SSAB
- FIMECC Ltd.
- Finnish Funding Agency for Innovation (TEKES)
Experimental fatigue data for butt-welded joints in as-welded condition and under constant amplitude tensile loading (secondary bending included) were analyzed using the nominal stress system and the notch stress system. Two approaches were used; a standard fitting procedure and minimization of the sum of squared perpendicular distances from a line with a fixed and free slope. In all cases, the latter method gave better agreement between the experimental and predicted fatigue life and fatigue strength. The analyses showed both with all broken specimen data included and with reduced data that the FAT225 curve, as recommended by IIW, might be too optimistic for the notch stress approach in the case of butt-welded joints in as-welded condition. It was also found that use of the local stress ratio instead of the applied stress ratio might explain many issues concerning current observations and apparent inconsistencies in reported literature. (C) 2015 Elsevier Ltd. All rights reserved.
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