Fatigue strength assessment of partial and full‐penetration steel and aluminium butt‐welded joints according to the peak stress method

Meneghetti, Giovanni; Campagnolo, Alberto; Berto, Filippo

doi:10.1111/ffe.12342

Cited by 54 publications

(42 citation statements)

References 25 publications

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“…over a semicircular sector shown in Fig. :

normalΔ \overset{W}{true} = \frac{e_{1}}{E} {[\frac{normalΔ K_{1}^{N}}{{R_{c}}^{1 - λ_{1}}}]}^{2} + \frac{e_{2}}{E} {[\frac{normalΔ K_{2}^{N}}{{R_{c}}^{1 - λ_{2}}}]}^{2},

where e 1 and e 2 are the parameters dependent on the opening angle 2 α and on the Poisson's ratio ν . A rapid calculation can be made for e 1 and e 2 from the following empirical equations:

e_{1} = - 5.373 \cdot 10^{- 6} {(2 α)}^{2} + 6.151 \cdot 10^{- 4} ((),, 2 α) + 0.1330,

e_{2} = 4.809 \cdot 10^{- 6} {(2 α)}^{2} - 2.346 \cdot 10^{- 4} ((),, 2 α) + 0.3400 .

…”

Section: Local Strain Energy Density Approachmentioning

confidence: 99%

Fatigue failure transition analysis in load‐carrying cruciform welded joints based on strain energy density approach

Song

Liu

Berto

et al. 2017

Fatigue Fract Eng Mat Struct

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This paper details a study of the application of notch stress intensity theory to the fatigue failure mode analysis of the transition in load‐carrying cruciform welded joints. The weldment fatigue crack initiation point is difficult to predict precisely because it usually occurs in the vicinity of the weld toe or weld root. To investigate the relationship between fatigue failure location and the geometry of the weldments, we analysed the weld toe and root asymptotic notch stress fields were analysed using the notch stress intensity factors on the basis of the Williams' solution in Linear Elastic Fracture Mechanics (LEFM). Numerous configurations of cruciform joints of various plate thicknesses, transverse plate thickness, weld sizes and incomplete penetration size were used to investigate the location of the fatigue failure. The strain energy density (SED) surrounding the notch tip was introduced to unify the scalar quantity and preclude the inconsistency of the dimensionality of the notch stress intensity factors for various notch opening angles. The results of the investigation showed that the SED approach can be used to determine the transition zone for a variety of joint geometries. The validity of the SED criteria was verified by comparing the experimental results of this study with the complied results for load‐carrying cruciform welded joints reported in literature.

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“…over a semicircular sector shown in Fig. :

normalΔ \overset{W}{true} = \frac{e_{1}}{E} {[\frac{normalΔ K_{1}^{N}}{{R_{c}}^{1 - λ_{1}}}]}^{2} + \frac{e_{2}}{E} {[\frac{normalΔ K_{2}^{N}}{{R_{c}}^{1 - λ_{2}}}]}^{2},

where e 1 and e 2 are the parameters dependent on the opening angle 2 α and on the Poisson's ratio ν . A rapid calculation can be made for e 1 and e 2 from the following empirical equations:

e_{1} = - 5.373 \cdot 10^{- 6} {(2 α)}^{2} + 6.151 \cdot 10^{- 4} ((),, 2 α) + 0.1330,

e_{2} = 4.809 \cdot 10^{- 6} {(2 α)}^{2} - 2.346 \cdot 10^{- 4} ((),, 2 α) + 0.3400 .

…”

Section: Local Strain Energy Density Approachmentioning

confidence: 99%

Fatigue failure transition analysis in load‐carrying cruciform welded joints based on strain energy density approach

Song

Liu

Berto

et al. 2017

Fatigue Fract Eng Mat Struct

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“…(3) and (4). In the recent literature, the PSM has been coupled to the averaged strain energy density (SED) criterion to assess the fatigue strength of welded joints subjected to axial [15,36,38,39], torsion [37,40] and multiaxial [41,42] loading conditions.…”

Section: Residual Stress Analysis On Welded Joints By Means Of Numerimentioning

confidence: 99%

Rapid Calculation of Residual Notch Stress Intensity Factors (R- NSIFs) by Means of the Peak Stress Method

Colussi¹,

Ferro²,

Berto³

et al. 2018

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

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The intensity of the residual singular stress distribution can be quantified by the residual notch stress intensity factor (R-NSIF), which might be a useful stress parameter to include in local approaches for fatigue strength assessments of welded joints. In order to calculate the residual stress fields by means of welding process simulations, the mesh adopted in numerical models has necessarily to be very fine. Unfortunately, the nonlinear and transient behavior of the welding simulation makes numerical analyses extremely demanding in terms of computational time, particularly, if large welded structures and/or multipass welds have to be simulated. In this scenario, the use of methods aimed at reducing the computational effort to estimate local stresses and strains in welded structures can be effective. Among these, the peak stress method has been proposed to estimate the notch stress intensity factors (NSIFs) at sharp V-notches, using coarse finite element patterns. In this work, the peak stress method (PSM) has been used to calculate the R-NSIF of a full penetration welded T-joint. It has been shown that the PSM can successfully be used to estimate R-NSIFs values, provided that the stress redistribution induced by plasticity in the zone very close to the notch tip is negligible.

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“…32,33 There are various analytical and numerical methods to compute the SIFs in the literature, such as using displacement or stress field, 17,18 J-integral method (based on the theorem of energy conservation), 34 energy release rate technique (according to elastic strain energy release respect to crack growth) 35,36 and crack tip stress method (based on the usefulness of stress values at a crack tip calculated by FEM). 37,38 Each of these methods has its own advantages. For example, in using displacement or stress field, the SIFs may be calculated directly, 17,18 while in energy release rate technique, the SIFs may be evaluated with coarse meshes.…”

Section: A L C U L a T I O N O F S T R E S S Intensity Factorsmentioning

confidence: 99%

Determination of stress intensity factors of 2D fracture mechanics problems through a new semi‐analytical method

Khaji

Yazdani

2015

Fatigue Fract Eng Mat Struct

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This study presents a novel development of a new semi‐analytical method with diagonal coefficient matrices to model crack issues. Accurate stress intensity factors based on linear elastic fracture mechanics are extracted directly from the semi‐analytical method. In this method, only the boundaries of problems are discretized using specific subparametric elements and higher‐order Chebyshev mapping functions. Implementing the weighted residual method and using Clenshaw–Curtis numerical integration result in diagonal Euler's differential equations. Consequently, when the local coordinates origin is located at the crack tip, the stress intensity factors can be determined directly without further processing. In order to present infinite stress at the crack tip, a new form of nodal force function is proposed. Validity and accuracy of the proposed method is fully demonstrated through four benchmark problems, which are successfully modeled using a few numbers of degrees of freedom. The numerical results agree very well with the analytical solution, experimental outcomes and the results from existing numerical methods available in the literature.

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Fatigue strength assessment of partial and full‐penetration steel and aluminium butt‐welded joints according to the peak stress method

Cited by 54 publications

References 25 publications

Fatigue failure transition analysis in load‐carrying cruciform welded joints based on strain energy density approach

Fatigue failure transition analysis in load‐carrying cruciform welded joints based on strain energy density approach

Rapid Calculation of Residual Notch Stress Intensity Factors (R- NSIFs) by Means of the Peak Stress Method

Determination of stress intensity factors of 2D fracture mechanics problems through a new semi‐analytical method

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