Fatigue Performance of Butt-Welded Joints Containing Various Embedded Defects

Abstract

The presence of possible welding defects needs to be taken into account in order to get rational performance of welded structural member considering its fitness for purpose. Accordingly, it is necessary to identify fatigue performance of welded joint containing various defects. Fatigue performance of butt-welded joint specimens considering five types of defect, which are vary in size and location, is studied in wider fatigue life range. It is observed that the shape, size, and location of the defects considerably affect the fatigue performance of the specimens. Fatigue life prediction by fracture mechanics analysis based on current recommendation is generally conservative in long life region.

Actual weld profile fatigue performance by digital prototyping of defected and un‐defected joints

“…Furthermore, if a three‐dimensional laser scanning of the weld is available, an accurate 3D model could be considered and the numerical analysis could give the exact point of the fatigue crack initiation. Alternatively, by means of linear fracture mechanics, the defects can be considered as an elliptical or semi elliptical crack, 11,12 and then, the propagation of the flaw can be considered according to the linear elastic fracture 13–15 …”

“…Alternatively, by means of linear fracture mechanics, the defects can be considered as an elliptical or semi elliptical crack, 11,12 and then, the propagation of the flaw can be considered according to the linear elastic fracture. [13][14][15] This paper examines the problem of threedimensional defects in welded joints by means of the implicit gradient approach. In particular, the undercuts problem is considered an example of the systematic analysis of the weld toe in complex structures.…”

Fatigue life prediction for Al–Zn–Mg alloy butt welded joints based on a fatigue damage model accounting for the influence of interior porosity

“…During the service process, the failure of welding structures usually arises in the welded joints due to the welding deformation, residual stress, and variation of microstructure and macroscopic properties of these joints caused by complex welding processes. 1,2 Additionally, internal defects such as welding pores and inclusions inevitably occur during the welding process, which are prone to be the source of crack initiation, 3 when welded joints experience cyclic loadings. The fatigue behavior of welded joints is undoubtedly a critical factor in the design and production of welded structures.…”