Fatigue strength of welded butt joints in thin and slender specimens

Lillemäe, Ingrit; Lammi, Heikki; Molter, Lars; Remes, Heikki

doi:10.1016/j.ijfatigue.2012.05.009

Cited by 64 publications

(55 citation statements)

References 12 publications

(12 reference statements)

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“…Those equations are applicable to weld toe failures. Furthermore, in, it is found that the stress magnification factors at the weld toe decreases with the increase in the load applied. This effect is significant for thick welded plates with high slenderness ratio L / t > 20.…”

Section: Fatigue Testingmentioning

confidence: 89%

The multiaxial weld root fatigue of butt welded joints subjected to uniaxial loading

Khurshid

Barsoum

et al. 2016

Fatigue Fract Eng Mat Struct

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A B S T R A C T In this study, the fatigue strength of inclined butt welds subjected to a proportional multiaxial stress state generated by uniaxial loading is studied in nominal and local stress concepts. The local methodologies studied included principal stress hypothesis, von Mises stress hypothesis and modified Wöhler curve method. Nominal methodologies included modified Gough-Pollard interaction equation, the design equation in Eurocode3 and the interaction equation in DNV standard. Results are evaluated along with data published in relevant literature. It is observed that both local and nominal stress assessment methods are able to estimate multiaxial fatigue strength. No obvious difference in fatigue strength is observed in the nominal stress concept, but the notch stress concept is able to capture a decrease in fatigue strength in shear-dominated joints. It is concluded that modified Wöhler curve method is a suitable tool for the evaluation of fatigue strength in joints dominated by both normal and shear stresses.Keywords fatigue strength; multiaxial stress ratio; multiaxial stress state; welded joints; weld inclination.N O M E N C L A T U R E FAT 95% = Fatigue strength corresponding to 2 × 10 6 cycles at failure with a survival probability of 95% and a confidence level of 75% FAT 50% = Fatigue strength corresponding to 2 × 10 6 cycles at failure with a survival probability of 50% and a confidence level of 75% E s = Elongation specified E = Young's modulus NA = Not applicable N f = Number of cycles to failure R = Stress ratio R y = Ratio of minimum yield to ultimate tensile strength of the material CV = Comparison value dependent on type of loading and material T = Triaxiality F = Applied load A = Weld throat area a = Weld throat size l = Weld length L = Length of flat plates t = Thickness of plates w = Specimen width w = Damage state variable f wd = Weld metal ultimate tensile strength k = Slope of SN curve k o = Slope of design SN curve Correspondence: M. Khurshid.

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Section: Fatigue Testingmentioning

confidence: 89%

The multiaxial weld root fatigue of butt welded joints subjected to uniaxial loading

Khurshid

Barsoum

et al. 2016

Fatigue Fract Eng Mat Struct

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“…Prompted by energy efficiency and fuel economy reasons, the structural lightweight design for large-size structures has been in the spotlight of the recent research in several industrial fields. For instance, modern cruise ships have been designed to accommodate an increased number of cabins and open spaces, thus directing shipbuilding towards new solutions in terms of space and weight in order to increase the performance of the structure [1][2][3][4][5]. Thinwalled structures represent an optimum solution to achieve this design target.…”

Section: Introductionmentioning

confidence: 99%

Stress magnification factor for angular misalignment between plates with welding-induced curvature

et al. 2020

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The construction of lightweight structures poses new design challenges as a result of the different mechanics of deformation experienced by thinner-plated structures. Because of a reduced bending stiffness, thin plates are particularly sensitive to welding-induced distortions, which include a curvature, in addition to the axial and global angular misalignment observed on thick plates. The curvature shape and amplitude determine a local angular misalignment at the welded joint, which causes non-negligible secondary bending effects. Therefore, the commonly used stress magnification factors k m solution for flat plates need a further development to include the curvature effect. This study proposes new analytical formulations, which extend the applicability of the existing solutions to the assessment of the structural stress of a curved thin plate under an axial load. The improved formulations are consistent with the geometrical non-linear finite element analysis under compression (up to ∼ 80% of the buckling limit) and tension (up to the yield strength). A sensitivity analysis is presented in order to show the dominant role of the curvature effect in the estimation of the k m factor. Regardless of the load applied, the presence of the curvature causes a flat plate solution inaccuracy greater than 10% when the local angular misalignment is more than 1.25 times higher than the global angular misalignment in the case of a thin and slender structure.

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“…It is the preferred method when high quality, clean and stronger welds are required. It is highly suited for welding small objects and thin sections of various light weight metals and non-metals [14][15][16]. The mechanical properties of the welded joints mainly depend on the welding parameters such as torch angle, the pulse frequencies, the electrode tip angle during welding operations, the quantity of the shielding gases, type of welding, pin rotation speed, traverse speed and stirrer geometry.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the study of mechanical properties and related significant factors has to be very effective in enhancing the knowledge in this field. In case of butt-welded joints, misalignment may consequence in residual bending stresses due to which the strength of weld component is severely affected [16][17][18]. These residual stresses may result in the decrement of ultimate tensile strength of the plate and the fatigue strength at the weld.…”

Section: Introductionmentioning

confidence: 99%

“…These residual stresses may result in the decrement of ultimate tensile strength of the plate and the fatigue strength at the weld. Several studies have been made to investigate the effects of various weldparameters on fatigue [5,6,11,12,[16][17][18] and tensile properties [7,[19][20][21] of welded components. However, little attention has been given to find the effect of notch and test parameters on the mechanical properties of a welded component.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Statistical Analysis of the Effect of Notches and Strain Rate on the Tensile Properties of Welded 6061 Aluminum Alloy

Chauhan

Singh

Gope

2016

Trans Indian Inst Met

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This paper emphasizes on the effect of notches and crosshead speed on yield strength and ultimate tensile strength of a TIG welded butt joint. In this experimental study 120 9 30 9 3.2 mm 3 welded double edge notched tensile specimens with four notch radii have been tested under uni-axial tensile loading at different crosshead speed. In the current work, the analysis of variance has been performed at 95 and 99 % confidence level to identify the significance of crosshead speed and notch radius in effecting the tensile properties. This study indicates that the crosshead speed is the main parameter which has the highest influence on the tensile properties of the welded components than notch. An attempt has been made to develop an empirical relationship to predict the tensile properties of TIG-welded 6061 aluminum alloy joints using non-linear regression analysis.

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Fatigue strength of welded butt joints in thin and slender specimens

Cited by 64 publications

References 12 publications

The multiaxial weld root fatigue of butt welded joints subjected to uniaxial loading

The multiaxial weld root fatigue of butt welded joints subjected to uniaxial loading

Stress magnification factor for angular misalignment between plates with welding-induced curvature

Statistical Analysis of the Effect of Notches and Strain Rate on the Tensile Properties of Welded 6061 Aluminum Alloy

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