Evaluation of magnesium weldment fatigue data using traction and notch stress methods

Zhou, Wenqing; Dong, Ping; Karakaş, Özler; Li, Xiangwei

doi:10.1016/j.ijfatigue.2020.105695

Cited by 24 publications

(9 citation statements)

References 30 publications

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“…To overcome this limitation, a post-processing program was used to calculate the mesh-insensitive traction stress. The detailed steps are as follows [21][22][23][24][25][26] :…”

Section: Traction Stress Calculationmentioning

confidence: 99%

“…Pan et al 7,18,19 calculated the global and local stress intensity factor solutions for the pre-existing and kinked cracks to predict the fatigue lives of laser welded lap specimens. Dong 20 proposed a traction stress approach for fatigue evaluation of welded joints, which is suitable for the fusion welded joints [21][22][23][24][25] and frictions stir welded joints 26 . In addition, Dong 27 also proposed a structural strain approach to consider the plastic deformation at the location of stress concentration under low-cycle loading conditions.…”

Section: Introductionmentioning

confidence: 99%

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The effect of angular distortion on the fatigue behavior of non-penetrating laser welded lap specimens of 301LN stainless steel

Guo

Liu²,

Li³

et al. 2020

Preprint

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In this work, the fatigue behaviors of non-penetrating laser welded lap specimens of cold-rolled 301LN austenitic stainless steel were investigated based on experiments and numerical analyses. The experiments showed the unequal-thickness specimens failed in the thicker bottom sheet under low fatigue loads, even though the mean stress in the thinner top sheet was higher, when the applied loads were high enough, the failure location changed from the bottom sheet to the top sheet. This phenomenon could be successfully explained through traction stress analysis considering the effect of angular distortion. However, the equivalent traction stress representation of fatigue data is below the ASME master S-N curve scatter band since the stress exceeds the yield limit of the base metal at low-cycle fatigue regime. The structural strain approach was then used to consider the effect of plastic deformation, and all fatigue data fall into ASME master E-N curve scatter band. This indicates the structural strain approach in conjunction with the master E-N curve is suitable for correlating both low-and high-cycle fatigue data of the non-penetrating laser welded lap specimens.

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“…To overcome this limitation, a post-processing program was used to calculate the mesh-insensitive traction stress. The detailed steps are as follows [21][22][23][24][25][26] :…”

Section: Traction Stress Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of angular distortion on the fatigue behavior of non-penetrating laser welded lap specimens of 301LN stainless steel

Guo

Liu²,

Li³

et al. 2020

Preprint

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“…Radaj 14,15 developed the notch stress approach by suggesting a fictitious radius

r_{f}

at weld notch. Karakas et al further develop this method, especially for magnesium and aluminum joints 6,16,17 . Frank et al 18 applied the notch stress method to assess root failure of thin‐sheet welded joint and recommended

r_{f} = 0.05 mm

.…”

Section: Introductionmentioning

confidence: 99%

“…Karakas et al further develop this method, especially for magnesium and aluminum joints. 6,16,17 Frank et al 18 applied the notch stress method to assess root failure of thin-sheet welded joint and recommended r f ¼ 0:05 mm. Xiao and Yamada 19 proposed to use the stress at a point 1 mm below the weld toe as a fatigue parameter corresponding to the FAT100 fatigue design curve.…”

mentioning

confidence: 99%

A data‐driven analysis for fatigue failure mode identification in load‐carrying fillet welded joint with mechanical data augmentation

Zhao

Zhang

Song

et al. 2022

Fatigue Fract Eng Mat Struct

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Weld toe and weld root failures dominate the fatigue failures of the loadcarrying cruciform fillet welded joints. Compared to weld toe failure, the weld root failure is strongly affected by its inherent weld quality and throat size, which is more unpredictable and should be eliminated. This work proposes a weld sizing criterion in terms of two weld leg sizes and weld penetration to avoid root failure. The criterion is obtained by a data-driven approach with the help of the mechanical-directed data augmentation technique. The tractionstress-based method is applied for the data augmentation to identify the fatigue failure mode, which is statistically tested against 372 experimentally obtained fatigue data.cruciform joint, data augmentation, data driven, weld root failure, weld sizing | INTRODUCTIONThe load-carrying cruciform fillet welded joint (LCFWJ) is broadly applied to connect secondary components to main members in metal structures. [1][2][3] Two failure modes dominate the fatigue fractures of LCFWJ, namely, weld toe and root failure, depending on the load conditions and the joint geometry, as illustrated in Figure 1. Fatigue crack initiating from the weld root and propagating into the fillet weld is referred to as weld root failure, which should be eliminated during the design stage of the welded structures because of two reasons. (1) Fatigue lives according to weld root failure is usually much lower than that associated with weld toe failure. As stipulated in EN-1993-1-9, 4 the S-N curve recommended for weld root failure falls into the worst possible category, namely, FAT36, which is lower than that of the weld toe failure. 5 Ziqi Zhao and Tairui Zhang contributed equally to this work and should be considered co-first authors.

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“…[6,7,15]. The equivalent notch stress method recommended by IIW 16 requires the use of a fine element size in the order of a fraction of millimeter, making it impractical to implement in modeling a complex vehicle structure. In all above cited investigations and decades of engineering practices, 1,11 it can be concluded that a quantitative and consistent determination of stress concentration at welded joints is the key to the fatigue life evaluation of welded structures.…”

Section: Introductionmentioning

confidence: 99%

Quantitative fatigue evaluation of complex welded connections and application in a train traction motor frame component

Chen

Dong

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part F:

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Welded connections are common in rail vehicle structures and associated equipment. It is well known that fatigue behaviors of welded structure are controlled by fatigue capability of welded joints. Although there exists numerous joint design guidance in Codes and Standards as well as best practices, they are largely empirical and difficult to apply in fatigue assessment of complex joints. In this paper, we adopt a mesh-insensitive structural stress method recently stipulated by ASME Code for fatigue evaluation of pressure vessels and piping components. Starting with stress concentration evaluation of two typical, but complex welded connections of relevance to some rail vehicle structures, we examine how the joint design principle inferred from the two examples can be effectively applied to an actual traction motor frame design and its effective fatigue improvement method. The experimental validation process is also presented for the proposed fatigue improvement technique.

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Evaluation of magnesium weldment fatigue data using traction and notch stress methods

Cited by 24 publications

References 30 publications

The effect of angular distortion on the fatigue behavior of non-penetrating laser welded lap specimens of 301LN stainless steel

The effect of angular distortion on the fatigue behavior of non-penetrating laser welded lap specimens of 301LN stainless steel

A data‐driven analysis for fatigue failure mode identification in load‐carrying fillet welded joint with mechanical data augmentation

Quantitative fatigue evaluation of complex welded connections and application in a train traction motor frame component

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