The use of peak stresses for fatigue strength assessments of welded lap joints and cover plates with toe and root failures

Meneghetti, Giovanni

doi:10.1016/j.engfracmech.2012.04.007

Cited by 67 publications

(99 citation statements)

References 21 publications

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“…• There is a standard mesh pattern close to the V-notch or crack tip that is reported in Figure 2 [34,36], where it is seen that four elements share the node located at the notch tip if the notch opening angle 2α is equal to or lower than 90 ; conversely, if the notch opening angle is 2α >90 , then two elements share the node at notch tip. Figure 2 shows examples of such mesh patterns in case of symmetric FE models.…”

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

confidence: 99%

“…Inspired by previous contributions by Nisitani and Teranishi [32,33] to rapidly estimate the mode I SIF of cracks, the PSM has been theoretically justified and extended to estimate also the mode I NSIF of pointed V-notches [34,35]; subsequently, it has been formulated for the mode II SIF of cracks [36] and the mode III NSIF of pointed V-notches [37].…”

Section: Analytical Background Of the Peak Stress Methodsmentioning

confidence: 99%

“…(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%

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

confidence: 99%

Section: Analytical Background Of the Peak Stress Methodsmentioning

confidence: 99%

See 1 more Smart Citation

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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“…(4) was applied to correlate the fatigue strength of fillet-and full penetration welded joints subjected to mode I loading [18,19]. Recently the Peak Stress Method has been extended also to mode II crack problems, linking the exact value of mode II NSIF K2, see Eq.…”

Section: The Peak Stress Methods For Pure Modes Of Loadingmentioning

confidence: 99%

Some relationships between the peak stresses and the local strain energy density for cracks subjected to mixed-mode (I+II) loading

Meneghetti¹,

Campagnolo²,

Berto³

2015

Frattura Ed Integrità Strutturale

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ABSTRACT. In this work, a link between the averaged strain energy density (SED) approach and the peak stress method in the case of cracks subjected to mixed mode (I+II) loading has been investigated. Some closed-form expressions of the strain energy density, averaged in a volume of radius R0, as function of the Stress Intensity Factors are provided for plane strain conditions under mixed mode I+II loadings, the material being thought of as isotropic and linear elastic. On the basis of the peak stress method (PSM) some expressions useful to estimate the mode I and mode II stress intensity factors (SIFs) have been recently derived. These relationships take advantage of the elastic peak stresses from FE analyses carried out by using a given mesh pattern where the element size and type are kept constants. The evaluation of the SIFs from a numerical analysis of the local stress field usually requires very refined meshes and then large computational effort. The usefulness of the PSM-based expressions is that (i) only the elastic peak stresses numerically evaluated at the crack tip are needed and not a set of stress-distance data; (ii) the employed meshes are rather coarse if compared to those necessary for the evaluation of the whole local stress field. By substituting the PSM-based relationships in the closed-form expressions of the averaged SED it appears that the latter can be directly estimated by means of the elastic peak stresses evaluated at the crack tip. Several FE analyses have been carried out on cracked plates subjected to tension loading considering different geometrical combinations, varying the length 2a and the inclination ϕ of the crack (i.e. the mode mixity) as well as the size d of the adopted finite elements, with the aim to evaluate the local SED and the elastic peak stress components σ peak and τ peak . In all cases the numerical values of the SED derived from the FE analyses have been compared with those analytically obtained by using the expressions for the SED based on the elastic peak stresses, in order to verify the range of applicability of the proposed relationships.

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“…In welded lap joints and cover plates, both mode I and mode II stresses are singular at the weld root, where fatigue cracks are likely to initiate. Meneghetti extended the peak stress method (PSM) to mode II loading conditions and derived an equivalent peak stress, which is used to assess either weld toe or weld root fatigue failures [6]. Al Zamzami and Susmel investigated the accuracy and reliability of hotspot stresses, nominal stresses, effective notch stresses, notch stress intensity factors (N-SIFs), and material length scale parameters in estimating the fatigue lifetime of aluminum welded joints [7].…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis and Experimental Study on Strength Optimization of a Plug‐In Oil Hose Joint

Chang

Guo

Zhang

et al. 2018

Advances in Materials Science and Engineering

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A plug-in oil hose joint is used as the research object in this study. Aimed at the problem of pipeline breakage due to insufficient strength of the joint during the process of oil transportation on the sea, a three-dimensional geometric model of the joint is constructed according to the structural characteristics of the plug-in joint. e mechanical properties of the plug-in hose joint were studied by numerical simulations and field experiments. e strength of the joint was optimized by applying materials with different properties and adjusting the circular angle of the joint. e tensile strength test results of the plug-in oil hose joint are consistent with the theoretical analysis, which shows that the method proposed in this paper can effectively improve the tensile strength of the oil hose joint. It is of great significance to expand the scope of the plug-in connector and ensure the safe and stable use of the hose system.

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The use of peak stresses for fatigue strength assessments of welded lap joints and cover plates with toe and root failures

Cited by 67 publications

References 21 publications

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

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

Some relationships between the peak stresses and the local strain energy density for cracks subjected to mixed-mode (I+II) loading

Simulation Analysis and Experimental Study on Strength Optimization of a Plug‐In Oil Hose Joint

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