Parametric evaluation of the stress concentration factors in T-butt welded connections

Terán, G.; Albiter, A.; Cuamatzi-Meléndez, Rubén

doi:10.1016/j.engstruct.2013.06.031

Cited by 21 publications

(12 citation statements)

References 12 publications

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“…Under this frame of ideas, in these works, T-welded connections were selected to estimate SCFs through 3D finite element models. The methodology by [4] was used to compute the SCF and finite elements features were presented. Dimensions of T-welded connections are presented in Figure 1.…”

Section: T-welded Connections Using Finite Element Methodsmentioning

confidence: 99%

“…For the finite element simulations, the following mechanical properties [4] of the A36 plates steel were applied: elastic modulus E=206 GPa; Poisson´s ratio γ=0.3 and yield stress (σ y ) = 250 MPa. To obtain reliable results it is important to conduct a calibration for the elements used [4]. The finite element size was calibrated and five different sizes were used to mesh the models in the range from 1 mm to 5 mm.…”

Section: T-welded Connections Using Finite Element Methodsmentioning

confidence: 99%

“…Such structures operate under harsh environmental conditions, such as hurricanes, cyclones and storms, causing localized fatigue cracking. It is a real concern for the oil and gas industry [2,4], since the loads are dynamic. Cracking could be repaired by grinding the damaged regions [5].…”

Section: Introductionmentioning

confidence: 99%

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Correlation of Stress Concentration Factors for T-Welded Connections – Finite Element Simulations and Fatigue Behavior

et al. 2017

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The stress concentration factors (SCFs) in welded connections usually occur at zones with high stress levels. Stress concentrations reduce the fatigue behavior of welded connections in offshore structures and cracking can develop. By using the grinding technique, cracking can be eliminated. Stress concentration factors are defined as a ratio of maximum stress at the intersection to nominal stress on the brace. Defining the stress concentration factor is an important stage in the fatigue behavior of welded connections. Several approaches have evolved for designing structures with the classical S-N approach for estimating total life. This work correlates to the stress concentration factors of T-welded connections and the fatigue behavior. Stress concentration factors were computed with the finite element employing 3D T-welded connections with intact and grinding depth conditions. Then, T-welded connections were constructed with A36 plate steel and welded with E6013 electrodes to obtain the stress-life (S-N) approach. The methodology from previous works was used to compute the SCF and fabricate the T-welded connections. The results indicated that the grinding process could restore the fatigue life of the T-welded connections for SCFs values in the range of 1.29. This value can be considered to be a low SCF value in T-welded connection. However, for higher SCF values, the fatigue life decreased, compromising and reducing the structural integrity of the T-welded connections.Nowadays, fatigue work on T-welded connections has been carried out, repaired by U-shape grinding under plane stress condition [7][8][9]. A better approach was achieved by performing 3D finite element modelling and applying empirical formulations [8,10]. Unfortunately, the empirical formulations can only be applied for a U-shape grinding depth of 27% of the plate thickness. For example, in the industry, deep cracks can be identified at

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Section: T-welded Connections Using Finite Element Methodsmentioning

confidence: 99%

Section: T-welded Connections Using Finite Element Methodsmentioning

confidence: 99%

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Correlation of Stress Concentration Factors for T-Welded Connections – Finite Element Simulations and Fatigue Behavior

et al. 2017

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“…The soil loss will make buried pipelines suspended. Under the influence of external loads such as gravity and pipe-soil interaction, the pipeline will produce large deformation and stress concentration because of the large span of suspension (Nishida, 1967;Li et al, 2011;Ma et al, 2012;Terán et al, 2013;Dabiri et al, 2017;Zhu et al, 2017;Wang et al, 2018). The geological loads will cause large displacement, creep, and buckling and even cause the pipeline to rupture due to large deformation and cause pipeline leakage.…”

Section: Introductionmentioning

confidence: 99%

Stress Analysis of the Effect of Additional Load on the Butt Weld of Suspended Pipeline With Variable Wall Thickness

Yingchao¹,

Yu²,

Wang³

et al. 2022

Front. Energy Res.

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Under the special geological environment of the buried pipe, the ground is lost at the bottom of the pipe, which is created by various kinds of external factors. The pipe in the suspended state would be greatly deformed due to its own weight, internal pressure, and other factors, resulting in the failure of the pipeline. When a variable wall thickness weld occurs in the suspended section of the pipeline, the change of the pipeline stress will be more complicated and changeable. In this study, ABAQUS software is used to establish a pipe–soil model of variable wall thickness butt welds of suspended pipelines. The axial stress distribution with different affected factors in the pipe, the change of curvature, and Mises stress change of the entire pipe along the axial direction are obtained by analyzing the internal pressure, wall thickness ratio, suspended length, weld position, and cone length. The results show that the stress at the root of the weld changes significantly; therefore, the weld has a greater impact on the stress of the entire pipeline. The change of internal pressure has little effect on the stress at the pipe weld. As the suspended length increases, the change in stress at the weld is more obvious. When the weld seam is close to the soil, the support of the soil will gradually shift the maximum stress position of the pipe from the top of the pipe to the bottom of the pipe. With the increase in cone length, it will reduce the sudden change of pipe section and the change in stress effectively. The places where the curvature greatly changes along the axial direction are at the pipe–soil separation and the middle of the pipeline, while the stress reaches the maximum at the pipe–soil separation, and the place with the largest stress change is the weld in the middle of the pipeline.

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“…Various types of the weld face geometry—plane, convex, or concave—may be obtained during manufacturing, which generally depend on the welding method, position, and parameters of the process, e.g., welding speed, current, etc. Some examples of real weld shapes and profiles influencing SCF values in cases of as-welded and intentionally improved weld toe zones are also given in References [ 25 , 26 , 27 , 28 , 29 ]. Many techniques have also been developed to improve the endurance limit and reliability of the structure (grinding, milling, re-melting techniques, etc.)…”

Section: Introductionmentioning

confidence: 99%

Stress Concentration Factors for Welded Plate T-Joints Subjected to Tensile, Bending and Shearing Loads

Molski

2021

Materials

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The paper deals with the problem of stress concentration at the weld toe of a plate T-joint subjected to axial, bending, and shearing loading modes. Theoretical stress concentration factors were obtained from numerical simulations using the finite element method for several thousand geometrical cases, where five of the most important geometrical parameters of the joint were considered to be independent variables. For each loading mode—axial, bending, and shearing—highly accurate closed form parametric expression has been derived with a maximum percentage error lower than 2% with respect to the numerical values. Validity of each approximating formula covers the range of dimensional proportions of welded plate T-joints used in engineering applications. Two limiting cases are also included in the solutions—when the weld toe radius tends to zero and the main plate thickness becomes infinite.

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Parametric evaluation of the stress concentration factors in T-butt welded connections

Cited by 21 publications

References 12 publications

Correlation of Stress Concentration Factors for T-Welded Connections – Finite Element Simulations and Fatigue Behavior

Correlation of Stress Concentration Factors for T-Welded Connections – Finite Element Simulations and Fatigue Behavior

Stress Analysis of the Effect of Additional Load on the Butt Weld of Suspended Pipeline With Variable Wall Thickness

Stress Concentration Factors for Welded Plate T-Joints Subjected to Tensile, Bending and Shearing Loads

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