Investigation of thickness and bead profile effects on fatigue strength of welded joints based on relative stress gradient

Shiratsuchi, Toru; Osawa, Naoki

doi:10.1016/j.ijfatigue.2020.105520

Cited by 15 publications

(3 citation statements)

References 6 publications

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“…Studies (Filippini, 2000; Gates and Fatemi, 2016; Shiratsuchi and Osawa, 2020) reveal that the stress gradient is closely related with the stress concentration factor Kt. In this sub-section, the effects of Kt are further investigated by the proposed method.…”

Section: Discussionmentioning

confidence: 99%

Development of a non-local approach for life prediction of notched specimen considering stress/strain gradient and elastic-plastic fatigue damage

Gao

Yang

Zhan

et al. 2022

International Journal of Damage Mechanics

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In this study, a non-local approach is developed for the fatigue life prediction of notched specimens, considering stress/strain gradient and elastic-plastic fatigue damage. The damage coupled constitutive models are presented to model the mechanical behavior of material. The critical plane method and triaxiality factor are employed to determine the location of the couple point. The gradient values of mechanical quantities are then computed, and the modified coefficients in damage models are acquired. The numerical simulations are implemented to compute the damage evolution process and predict fatigue life. Meanwhile, the coupling effects between stress field and damage field are considered. The predicted results are verified by experimental data, and also compared with the local method. Finally, the influence of stress concentration factor, shape of notch, and cyclic variation of stress/strain gradient are further investigated.

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Section: Discussionmentioning

confidence: 99%

Development of a non-local approach for life prediction of notched specimen considering stress/strain gradient and elastic-plastic fatigue damage

Gao

Yang

Zhan

et al. 2022

International Journal of Damage Mechanics

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“…Chen et al (2023) compared the Application of notch equivalent stress biaxial tensile-torsional fatigue performance of welded joint specimens and base material of rail vehicle bogies to obtain the relationship between the magnitude of the equivalent stress and the cyclic fatigue life of the specimen. Shiratsuchi and Osawa (2020) conducted fatigue tests on different types of welded joints and found that the change in stress gradient at the weld toe was influenced by the radius of the weld toe and proposed a fatigue life prediction method that is insensitive to the type of joint. Dong (2001) used the finite element method to calculate the nodal stress and bending moments, obtained the structural stresses at the welded position based on the free-body section method, and derived the equation for the equivalent structural stress ΔSs based on fracture mechanics as the theoretical basis, combined with the stress parameters associated with fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Modification and application of notch equivalent stress method for fatigue assessment on welded structures

Liu

Wang

Zhang

et al. 2023

IJSI

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PurposeThis paper aims to study and modify the notch equivalent stress method, as well as to establish the notch equivalent stress range S–N curve and apply it to the fatigue assessment of engineering examples.Design/methodology/approachThis paper studies the notch equivalent stress method and puts forward the concept of “singular equivalent crack”. Combined with the fatigue test results, by proposing to consider the singular coefficient of the transition angle of the welded structure and the introduction of material correction factors, this paper derives the notch equivalent stress equation for commonly used welded joints applicable to steel, and finally establishes the notch equivalent stress range of the S–N curve.FindingsThe obtained results show that the dispersion of fatigue data is 65.6 and 75.4% for T-joints and transverse cross-joints, respectively, under S–N curves using notched equivalent stress compared to the nominal stress range. The fatigue evaluation error of the modified notch equivalent stress equation for transverse cross welded joints improved by 50.65%, 53.1 and 39.6% on average, respectively, compared to the original other methods. The fatigue evaluation error for T-joints improved by 13.4 and 13.9%, respectively, compared to the original other methods.Originality/valueThere are relatively few studies on the fatigue assessment of notch equivalent stress method. In this paper, the notch equivalent stress method is studied and modified to improve the accuracy of fatigue assessment of welded structures with singular stresses.

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“…Combined with the fatigue test data, it is demonstrated that the crack growth rate is correlated with the accumulated strain. Shiratsuchi et al [14] conducted fatigue tests on different types of welded joints, found that the change of stress gradient at the weld toe was greatly affected by the radius of the weld toe, and proposed a fatigue life prediction method that is insensitive to the joint type. Yang et al [15] measured the fatigue limit of titanium alloy welded joints of two materials, TC11 and TC17, by linear friction welding.…”

Section: Introductionmentioning

confidence: 99%

A New Method for Fatigue Evaluation of Titanium Alloy Welded Structures

Zhang

Wang

Yu³

et al. 2022

Applied Sciences

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In this paper, a new fatigue life evaluation method, namely augmented-reverse notch equivalent stress method, is proposed for titanium alloy welded structures with stress singularities. First, a new three-parameter power function model is proposed in this paper, and the notch stress equivalent value method with correction factor is deduced. Combining the two, the theoretical framework of the augmented-reverse notch equivalent stress method is obtained. Within this framework, the fatigue test data of four titanium alloy welded joints with the same grade were used for analysis, and a new three-parameter power function model of titanium alloy welded structure was established. According to the calculation method of the notch equivalent stress correction factor, the correction factor suitable for the titanium alloy welded structure was obtained. Finally, the fatigue test data, different from the above titanium alloy welded structure, are used to verify the augmented-reverse notch equivalent stress method. The verification results show that the augmented-reverse notch equivalent stress method improves the effectiveness and accuracy of fatigue life evaluation and establishes a new life evaluation method for titanium alloy welded structures with stress singularities.

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Investigation of thickness and bead profile effects on fatigue strength of welded joints based on relative stress gradient

Cited by 15 publications

References 6 publications

Development of a non-local approach for life prediction of notched specimen considering stress/strain gradient and elastic-plastic fatigue damage

Development of a non-local approach for life prediction of notched specimen considering stress/strain gradient and elastic-plastic fatigue damage

Modification and application of notch equivalent stress method for fatigue assessment on welded structures

A New Method for Fatigue Evaluation of Titanium Alloy Welded Structures

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