Fatigue analysis of multipass welded joints considering residual stresses

Lopez-Jauregi, A.; Esnaola, J.A.; Ulacia, I.; Urrutibeascoa, I.; Madariaga, A.

doi:10.1016/j.ijfatigue.2015.04.013

Cited by 29 publications

(14 citation statements)

References 26 publications

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“…It can be observed that maximum stress is generated next to the weld seam. Figure 22 shows the evolution of maximum equivalent uniaxial RS in the critical plane, which is especially interesting to conduct fatigue assessment [58], for different welded plate thickness. Two different trends clearly are observed:…”

Section: Loads and Boundary Conditionsmentioning

confidence: 99%

Residual Stress Pattern Prediction in Spray Transfer Multipass Welding by Means of Numerical Simulation

Esnaola¹,

Ulacia²,

Lopez-Jauregi³

et al. 2018

Residual Stress Analysis on Welded Joints by Means of Numerical Simulation and Experiments

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One of the main problems of gas metal arc welding (GMAW) process is the generation of residual stresses (RS), which has a direct impact on the mechanical performance of welded components. Nevertheless, RS pattern prediction is complex and requires the simulation of the welding process. Consequently, most of the currently used dimensioning approaches do not consider RS, leading to design oversized structures. This fact is especially relevant in big structures since it generates high material, manufacturing and product transportation costs. Nowadays, there are different numerical methods to predict the RS generated in GMAW process, being Goldak's method one of the most widely used model. However, the use of these methods during the design process is limited, as they require experimentally defining many parameters. Alternatively, in this chapter, a new methodology to define the heat source energy based on the spray welding physics is exposed. The experimental validation of the methodology conducted for a multipass butt weld case shows good agreement in both the temperature pattern (9.16% deviation) and the RS pattern (42 MPa deviation). Finally, the proposed methodology is extended to analyse the influence of the thickness and the number of passes in the RS pattern of thick T-joint welds.

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Section: Loads and Boundary Conditionsmentioning

confidence: 99%

Residual Stress Pattern Prediction in Spray Transfer Multipass Welding by Means of Numerical Simulation

Esnaola¹,

Ulacia²,

Lopez-Jauregi³

et al. 2018

Residual Stress Analysis on Welded Joints by Means of Numerical Simulation and Experiments

View full text Add to dashboard Cite

show abstract

“…The experimental results for numerical correlation have been taken from previous work done by the authors [13], and they are summarized in Table 1. Additionally, HCF calibrated parameters for the base material S275JR is summarized in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…The results obtained by this numerical method were compared to experimental results, obtaining a very good agreement. Therefore, we can say that this numerical prediction method is widely validated [12,13,16,17].…”

Section: Fig 2 Simulation Of the Welding Processmentioning

confidence: 99%

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A numerical analysis of multiaxial fatigue in a butt weld specimen considering residual stresses

et al. 2018

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Residual Stress (RS) pattern changes considerably depending on the width of the plates and the welding parameters, having effect on the fatigue strength. Most of the standards do not consider them and in some works, yield stress is taken as residual stress value. It results in a very conservative estimation of fatigue life. Authors developed recently a numerical model to predict more properly the value of RS pattern depending on the plate thickness. In a welded joint, considering the RS and alternating axial loads, the evolution of the stresses is multiaxial, becoming necessary its study. Therefore, the aim of this work is to analyse different fatigue indicator parameters (Smith-Watson-Topper, Fatemi-Socie, and Critical Plane implementation of the Basquin equation) in order to predict the fatigue behaviour of butt-weld components. For that purpose, the numerical model to predict the RS pattern in welded joint developed by this research group is used.

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“…In the work of Mochizuchki et al [34], for example, the residual stresses were treated as mean stresses and their effect on the fatigue strength was taken into account in a modified Goodman diagram. In more recent work, Lopez-Jauregi et al [35] considered the influence of residual stress in the weld zone by using the critical plane approach proposed by Papadopulos [36] and that was extended some years later to welded structures by Carpinteri [36].…”

Section: Introductionmentioning

confidence: 99%

Asymptotic residual stress distribution induced by multipass welding processes

Ferro

Berto

James

2017

International Journal of Fatigue

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In the high cycle fatigue (HCF) regime, the fatigue strength of welded joints is influenced by residual stresses (RS) induced during welding processes. If the weld toe is modelled via a sharp V-notch, the distribution of weld toe residual stress can be shown to be asymptotic with a singularity which follows either the linear-elastic or elastic-plastic solution depending on parameters that range across material properties, specimen clamping conditions, and the welding process. For thicker plates, multipass welding is used instead of single-pass welding to reduce the heat input and hence the width of the fusion zone (FZ) and heat-affected zone (HAZ). However, for a fixed plate thickness, the magnitude and extent of residual stresses near the weld toe will vary according to the number of passes used in the welding operation. In this paper the influence of multipass welding on the residual stress field near the weld toe has been analysed using a combination of analytical and numerical techniques. It was found that the higher the number of weld passes, the higher the magnitude of the residual asymptotic stress field near the weld toe

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Fatigue analysis of multipass welded joints considering residual stresses

Cited by 29 publications

References 26 publications

Residual Stress Pattern Prediction in Spray Transfer Multipass Welding by Means of Numerical Simulation

Residual Stress Pattern Prediction in Spray Transfer Multipass Welding by Means of Numerical Simulation

A numerical analysis of multiaxial fatigue in a butt weld specimen considering residual stresses

Asymptotic residual stress distribution induced by multipass welding processes

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