Multiaxial fatigue strength assessment of welded joints using the Peak Stress Method – Part II: Application to structural steel joints

Meneghetti, Giovanni; Campagnolo, Alberto; Rigon, Daniele

doi:10.1016/j.ijfatigue.2017.03.039

Cited by 38 publications

(27 citation statements)

References 24 publications

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“…It is worth noting that any NSIF-based approach for the structural strength assessment can in principle be reformulated on the basis of the PSM. Recently, the PSM has been applied in combination with the approach based on the averaged strain energy density (SED) to assess the fatigue strength of welded joints under axial [15,17], torsion [16] and multiaxial [18,19] loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Rapid estimation of notch stress intensity factors in 3D large-scale welded structures using the peak stress method

Campagnolo

Meneghetti

2018

MATEC Web Conf.

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The Peak Stress Method (PSM) is an engineering, FE-oriented application of the notch stress intensity factor (NSIF) approach to fatigue design of welded joints, which takes advantage of the singular linear elastic peak stresses from FE analyses with coarse meshes. Originally, the PSM was calibrated to rapidly estimate the NSIFs by using 3D, eight-node brick elements, taking advantage of the submodeling technique. 3D modelling of large-scale structures is increasingly adopted in industrial applications, thanks to the growing spread of high-performance computing (HPC). Based on this trend, the application of PSM by means of 3D models should possibly be even more speeded up. To do this, in the present contribution the PSM has been calibrated under mode I, II and III loadings by using ten-node tetra elements, which are able to directly discretize complex 3D geometries without the need for submodels. The calibration of the PSM has been carried out by analysing several 3D mode I, II and III problems. Afterwards, an applicative example has been considered, which is relevant to a large-scale steel welded structure, having overall size on the order of meters. Two 3D FE models, having global size of tetra elements equal to 5 and 1.66 mm, have been solved by taking advantage of HPC, being the global number of degrees of freedom equal to 10 and 140 millions, respectively. The NSIFs values estimated at the toe and root sides according to the PSM have been compared with those calculated by adopting a shell-to-solid technique.

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Section: Introductionmentioning

confidence: 99%

Rapid estimation of notch stress intensity factors in 3D large-scale welded structures using the peak stress method

Campagnolo

Meneghetti

2018

MATEC Web Conf.

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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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“…SED was verified by welded joints and V‐notch specimens. Meneghetti et al presented peak stress method (PSM) to assess the fatigue strength of welded joints by establishing a link between the exact value of mode I notch stress intensity factor (N‐SIF) K 1N and the maximum elastic principal stress σ max calculated by means of a FE analysis at the V‐notch tip. The main methods for evaluating the multiaxial fatigue life of notched specimens are the combination of a critical plane‐based criterion proposed for smooth specimens (CPS) and TCD .…”

Section: Introductionmentioning

confidence: 99%

A notch critical plane approach of multiaxial fatigue life prediction for metallic notched specimens

Luo

Yao

2018

Fatigue Fract Eng Mat Struct

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An approach based on the local stress response is proposed to locate the fatigue critical point for metallic blunt notched specimens under multiaxial fatigue loading. According to the stress analysis, both stress gradient and gradient of loading nonproportionality exist at notch root. The plane in the vicinity of the notch that passes through the fatigue critical point and experiences the maximum shear stress amplitude is defined as the critical plane for notch specimens (CPN). Furthermore, the Susmel's fatigue damage parameter is modified to assess fatigue life of notched components by combining CPN and the theory of critical distance (TCD). The multiaxial fatigue test of the thin‐walled round tube specimens made of Ni‐base alloy GH4169 is carried out to verify the above approaches. In addition, test data of two kinds of materials are collected. The results show that the maximum absolute error of the fatigue critical point is 9.6° and the majority of the predicted life falls within the three‐time scatter band.

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Multiaxial fatigue strength assessment of welded joints using the Peak Stress Method – Part II: Application to structural steel joints

Cited by 38 publications

References 24 publications

Rapid estimation of notch stress intensity factors in 3D large-scale welded structures using the peak stress method

Rapid estimation of notch stress intensity factors in 3D large-scale welded structures using the peak stress method

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

A notch critical plane approach of multiaxial fatigue life prediction for metallic notched specimens

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