Assessment of Fatigue Strength of Cruciform Welded Joints Failing From Weld Roots Under Out-of-Plane Bending

Mori, Takeshi; Uchida, Daisuke; Fukuoka, Tetsuji; Myoken, Masao

doi:10.2208/jsceja.66.568

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…1 by numerical and experimental results. Similar differences in crack paths for joints under axial and bending loads have been also demonstrated in previous works dealing with LCX joints with root failures; see, e.g., [10][11][12]23]. Based on the crack propagation analysis, the different crack paths can be explained by the stress field at the weld root, and the crack path corresponds to the maximum principle stress direction.…”

Section: Introductionsupporting

confidence: 77%

“…Ghafoori-Ahangar and Verreman [10] evaluated the fatigue strength of LCX joints made of stainless steel grades under three-point bending and Mori et al [11,12] fatiguetested LCX joints made of a mild structural steel grade. In both studies, the ligament size (weld size and penetration) was found as an important factor influencing the weld root fatigue performance under bending.…”

Section: Introductionmentioning

confidence: 99%

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On the interaction of axial and bending loads in the weld root fatigue strength assessment of load-carrying cruciform joints

et al. 2022

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Current design standards and recommendations incorporate the nominal stress system for assessing the fatigue strength capacity of load-carrying cruciform (LCX) joints with the fillet welds and failing from the weld root. Thus far, bending-loaded joints have not been addressed in these standards. The aim of the present study is to investigate the fatigue performance of LCX joints subjected to cyclic axial and bending loads. Firstly, fatigue test data sets of such joints subjected to axial loading and bending loads in the adjoined plate component are extracted from the literature, and statistical analyses are carried out to evaluate the fatigue strength capacity using the nominal weld stresses (NWSs). Secondly, experimental fatigue tests are carried out on LCX joints made of ultra-high-strength steel (UHSS) grade using constant amplitude loading and subjected to combined axial and bending load to study the load interaction effects on the fatigue strength capacity. The results showed that the FAT36 detail category for the weld root failures is applicable for bending-loaded joints when applying NWSs calculated on the basis of effective throat thickness of weld and assuming linear-elastic stress distribution over the joint section. The effective notch stress analyses showed unconservative results for the tested joints, when applying FAT225 design curve with the reference radius of rref = 1.0 mm.

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Section: Introductionsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

On the interaction of axial and bending loads in the weld root fatigue strength assessment of load-carrying cruciform joints

et al. 2022

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Weld root fatigue assessment of load-carrying fillet welded joints: 4R method compared to other methods

Raftar

Dabiri

Ahola

et al. 2022

International Journal of Fatigue

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Fatigue strength of cruciform joints with laser-arc hybrid welding

Hanji

Tateishi

Shimizu

et al. 2018

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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cyclic loads. Measurements of weld toe profile, residual stress and hardness around a welded portion were also conducted. The test results revealed that the fatigue strength of the hybrid welded joints is equivalent to that of arc welded joints and satisfies the fatigue design curves for arc welded joints in JSSC recommendation. Besides, the thickness effect on fatigue strength was observed in the hybrid welded joints as well as in arc welded joints.

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Assessment of Fatigue Strength of Cruciform Welded Joints Failing From Weld Roots Under Out-of-Plane Bending

Cited by 3 publications

References 7 publications

On the interaction of axial and bending loads in the weld root fatigue strength assessment of load-carrying cruciform joints

On the interaction of axial and bending loads in the weld root fatigue strength assessment of load-carrying cruciform joints

Weld root fatigue assessment of load-carrying fillet welded joints: 4R method compared to other methods

Fatigue strength of cruciform joints with laser-arc hybrid welding

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