Fatigue analysis of welded joints with the aid of real three-dimensional weld toe geometry

Hou, Chien-Yuan

doi:10.1016/j.ijfatigue.2006.06.007

Cited by 57 publications

(31 citation statements)

References 26 publications

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“…Fatigue crack initiation is difficult to observe [7,8] and is usually estimated by the weld toe stress concentration factor (SCF). Crack propagation is analysed by stress intensity factors (SIF) employing a linear elastic fracture mechanics approach [9]. The estimation of fatigue life usually approximates the weld toe geometry to a weld angle, and a circle defines the weld toe radius.…”

Section: Introductionmentioning

confidence: 99%

The influence of surface geometry and topography on the fatigue cracking behaviour of laser hybrid welded eccentric fillet joints

Alam¹,

Barsoum²,

Jonsén³

et al. 2010

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

The influence of surface geometry and topography on the fatigue cracking behaviour of laser hybrid welded eccentric fillet joints

Alam¹,

Barsoum²,

Jonsén³

et al. 2010

Applied Surface Science

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“…Meneghetti et al 16 proposed a new approach, which combined the peak stress method and 3D finite element models, for fatigue assessment of toe and root cracking in steel-welded joints subjected to axial or bending loading. The weld toe magnification factor solutions for the three types of welded joints were provided through a parametric study using 3D finite elements by Han et al 17 Also, the studies based on a combination of experimental, theoretical and numerical methods can refer to Brenmann et al, Alam and Wahab, Lu, Choi et al, Hou, Fersini and Pirondi, and Frank et al [18][19][20][21][22][23][24] However, the influence of load shedding on the structural fatigue analysis for the welded structure is not considered in the aforementioned studies, which may cause completely different results. In crashworthiness designs, [25][26][27][28] one can describe load shedding as a mechanism in which a load is redistributed in the cracked component because of its redundancy.…”

Section: N O M E N C L a T U R Ementioning

confidence: 99%

“…Meneghetti et al proposed a new approach, which combined the peak stress method and 3D finite element models, for fatigue assessment of toe and root cracking in steel‐welded joints subjected to axial or bending loading. The weld toe magnification factor solutions for the three types of welded joints were provided through a parametric study using 3D finite elements by Han et al Also, the studies based on a combination of experimental, theoretical and numerical methods can refer to Brenmann et al , Alam and Wahab, Lu, Choi et al , Hou, Fersini and Pirondi, and Frank et al …”

Section: Introductionmentioning

confidence: 99%

Fatigue reliability study on T‐welded component considering load shedding

Liu

Qing

Deng

et al. 2015

Fatigue Fract Eng Mat Struct

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In this paper, a coupled reliability method for structural fatigue evaluation considering load shedding is first proposed based on probabilistic fracture mechanics in which the uncertainties of the structural parameters are taken into account. Then, the method is applied to predict the fatigue reliability of the T‐welded structure to the case of considering load shedding or not. The compared results show that by considering the load shedding, the structural fatigue reliability might be improved with less conservativeness. The influence rules of the load‐shedding coefficient on the fatigue failure probability of the T‐welded component are investigated, and some interesting results are obtained. That is, the influences of load‐shedding coefficient on the fatigue failure probability can be divided into three regions, namely the high, medium and low fatigue failure areas. The last area is the most intriguing when we try to design a T‐welded structure. The thickness of T‐welded structure along the crack propagation direction is found to be one of the important design variables for the design of fatigue reliability, in which the low‐fatigue failure zone is used as one of the reliability constraints. The basic design frame of T‐welded structure is established to constrain the fatigue failure probability within the low‐fatigue failure area.

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“…16 These approaches remain in the majority of cases deterministic. However, considering the development of the reliability fatigue based methods [17][18][19][20] taking into account the scatterings and the significant dispersions related to the used geometrical and material parameters, 21,22 it seems to be necessary and with substantial benefit to analyse the HCF behaviour of the welded joints using probabilistic methods. Indeed, these stochastic approaches used for the assessment of fatigue reliability have attracted significant attention in the recent studies.…”

Section: H I G H C Y C L E Fa T I G U E B E H a V I O U R P R E D I Cmentioning

confidence: 99%

Probabilistic prediction of high cycle fatigue reliability of high strength steel butt‐welded joints

Sghaier

Bouraoui

Fathallah

et al. 2010

Fatigue Fract Eng Mat Struct

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A B S T R A C T The aim of this paper is to develop a probabilistic approach of high cycle fatigue (HCF) behaviour prediction of welded joints taking into account the surface modifications induced by welding and the post-welding shot peening treatment. In this work, the HCF Crossland criterion has been used and adopted to the case of welded and shot peened welded parts, by taking into account the surface modifications which are classified as follows: (i) the compressive residual stresses, (ii) the surface work-hardening, (iii) the geometrical irregularities and (iv) the superficial defects. The random effects due to the dispersions of: (i) the HCF Crossland criterion material characteristics (ii) the applied loading and (iii) the surface modifications parameters are introduced in the proposed model. The HCF reliability has been computed by using the 'strength load' method with Monte Carlo simulation. The reliability computation results lead to obtain interesting and useful iso-probabilistic Crossland diagrams (PCD) for different welding and shot peening surface conditions. To validate the proposed method, the approach has been applied to a butt-welded joint made of S550MC high strength steel (HSS). Four types of specimens are investigated: (i) base metal (BM), (ii) machined and grooved (MG) condition, (iii) As welded (AW) condition and (iv) as welded and shot peened (AWSP) condition. The comparison between the computed reliabilities and the experimental investigations reveals good agreement leading to validate the proposed approach. The effects of the different welded and post-weld shot peened specimen's surface properties are analysed and discussed using the design of experiments (DoE) techniques.Keywords design of experiments; fatigue reliability; high cycle fatigue criterion; shot peening; surface integrity; welded joints. N O M E N C L A T U R Eσ eq , σ affecetd eq = equivalent stress appearing in HCF Crossland criterion for the non-peened and peened material, respectively Cov = coefficient of variation (ratio of the standard deviation of a distribution to its arithmetic mean)expectation operator F WHM(z) = in-depth profile of the Full Width at Half Maximum of the shot-peened material F WHM 0 = full width at half maximum of the non-peened material f Xi (x i ) = probability density function of the variable x i f {X} ({x}) = joint probability density function of the vector {X} Correspondence: C. Bouraoui.

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Fatigue analysis of welded joints with the aid of real three-dimensional weld toe geometry

Cited by 57 publications

References 26 publications

The influence of surface geometry and topography on the fatigue cracking behaviour of laser hybrid welded eccentric fillet joints

The influence of surface geometry and topography on the fatigue cracking behaviour of laser hybrid welded eccentric fillet joints

Fatigue reliability study on T‐welded component considering load shedding

Probabilistic prediction of high cycle fatigue reliability of high strength steel butt‐welded joints

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