Fatigue strength of steel rollers with failure occurring at the weld root based on the local strain energy values: modelling and fatigue assessment

Berto, Filippo; Campagnolo, Alberto; Chebat, Francesco; Cincera, M.; Santini, Manuela Favarin

doi:10.1016/j.ijfatigue.2015.09.023

Cited by 45 publications

(50 citation statements)

References 42 publications

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“…he strain energy density (SED) averaged over a control volume, the radius of which is thought of as a material property according to Lazzarin and Zambardi [14], proved to efficiently account for notch effects both in static [14,21] and fatigue [14,22,23] structural strength problems. The idea is reminiscent of the stress averaging to perform along a material-dependent microstructural length, according to the approach proposed by Neuber.…”

Section: Averaged Strain Energy Density Approachmentioning

confidence: 99%

“…pure bending, 3D FE analyses of the cylindrical specimens were needed to evaluate the averaged SED. To obtain the 3D mesh, first, a 2D free mesh pattern of quadrilateral 8-node PLANE 183 elements has been generated; after that, the 2D FE mesh has been extruded about Y axis by using 3D 20-node brick elements (SOLID186 of the Ansys® element library) and by setting a proper extrusion step size in order to obtain a control volume V having both radius and depth equal to R0,I, as suggested for 3D applications of the SED approach [21,23]. An example of the adopted FE mesh along with a detail of the structural volume for averaged SED calculation is reported in Fig.…”

Section: Sed-based Reanalysis Of Crack Initiation and Total Life Expementioning

confidence: 99%

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Crack initiation life in notched Ti-6Al-4V titanium bars under uniaxial and multiaxial fatigue: synthesis based on the averaged strain energy density approach

Meneghetti¹,

Campagnolo²,

Berto³

et al. 2017

Frattura Ed Integrità Strutturale

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ABSTRACT. The fatigue behaviour of circumferentially notched specimens made of titanium alloy, Ti-6Al-4V, has been analysed. To investigate the notch effect on the fatigue strength, pure bending, pure torsion and multiaxial bending-torsion fatigue tests have been carried out on specimens characterized by two different root radii, namely 0.1 and 4 mm. Crack nucleation and subsequent propagation have been accurately monitored by using the direct current potential drop (DCPD) technique. Based on the results obtained from the potential drop technique, the crack initiation life has been defined in correspondence of a relative potential drop increase V/V0 equal to 1%, and it has been used as failure criterion. Doing so, the effect of extrinsic mechanisms operating during crack propagation phase, such as sliding contact, friction and meshing between fracture surfaces, is expected to be reduced. The experimental fatigue test results have been re-analysed by using the local strain energy density (SED) averaged over a structural volume having radius R0 and surrounding the notch tip. Finally, the use of the local strain energy density parameter allowed us to properly correlate the crack initiation life of Ti-6Al-4V notched specimens, despite the different notch geometries and loading conditions involved in the tests.

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Section: Averaged Strain Energy Density Approachmentioning

confidence: 99%

Section: Sed-based Reanalysis Of Crack Initiation and Total Life Expementioning

confidence: 99%

Crack initiation life in notched Ti-6Al-4V titanium bars under uniaxial and multiaxial fatigue: synthesis based on the averaged strain energy density approach

Meneghetti¹,

Campagnolo²,

Berto³

et al. 2017

Frattura Ed Integrità Strutturale

View full text Add to dashboard Cite

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“…Stress field expressions valid for special cases can be derived from the general expressions. [38][39][40] An alternative approach based on the NSIF is the peak stress method (PSM) proposed by Meneghetti and Lazzarin. Because of the inconsistency of unit of the different opening angle NSIF values, the NSIFs corresponding to different opening angle V-notches cannot be compared directly.…”

Section: Introductionmentioning

confidence: 99%

Stress distribution and fatigue crack propagation analyses in welded joints

Dong

Soares

2018

Fatigue Fract Eng Mat Struct

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An approach is presented, based on the weight function method to calculate the stress intensity factors of semielliptical surface cracks originating from the notch root of welded joints. The stress distribution along the potential crack plane required in the weight function method is constructed on the basis of the notch stress intensity factor approach in the highly stressed zone and of the equivalent linearized stress distribution and is compared with those determined by the finite element method and existing predictions. The stress intensity factors determined by the proposed approach are compared with available solutions. These comparisons show that the results determined by the proposed approach generally agree well with the existing solutions. For the cases where the agreement is poor, the reasons are identified. One important feature of the proposed approach is that the stress singularity at sharp notch tip can be considered, which cannot be appropriately simulated by the finite element method. Finally, to demonstrate the applicability of the proposed approach, the fatigue life and the fatigue crack shape evolution of welded joints are predicted and they are compared with experimental results.

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“…In the last 10 years, a notable contribution to SED theories has been done, that is, the averaged SED (ASED) approach . For example, some advantages derived from the use of SED over a control volume in fatigue strength assessments of welded joints were pointed out .…”

Section: Introductionmentioning

confidence: 99%

Energy density zone model and fatigue life prediction considering microscopic effects

Zhang

Fan

Tang

2016

Fatigue Fract Eng Mat Struct

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An energy density zone (EDZ) model is developed for the prediction of fatigue life. The microscopic effects can be involved in the EDZ model. Three scale transitional functions in the model are utilized to describe the trans‐scale behaviours of fatigue failure from micro‐scale to macro‐scale. Fatigue failure behaviours of a low‐alloy and ultra‐high‐strength steel material (i.e. 40CrNi2Si2MoVA steel) is investigated. Two fatigue parameters in the model are determined from the experimental S–N curves for the smooth cylinder specimens (the stress concentration factor, SCF, Kt = 1). Then, fatigue lives of notched specimens with SCFs Kt = 2 and Kt = 3 are predicted respectively by the proposed model. The predicted S–N curves are satisfactory in comparison with the experimental results. Scatter of the fatigue test data can be depicted when the microscopic effects are considered. Influences of microscopic effects on the fatigue behaviours are explored by means of numerical simulations.

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Fatigue strength of steel rollers with failure occurring at the weld root based on the local strain energy values: modelling and fatigue assessment

Cited by 45 publications

References 42 publications

Crack initiation life in notched Ti-6Al-4V titanium bars under uniaxial and multiaxial fatigue: synthesis based on the averaged strain energy density approach

Crack initiation life in notched Ti-6Al-4V titanium bars under uniaxial and multiaxial fatigue: synthesis based on the averaged strain energy density approach

Stress distribution and fatigue crack propagation analyses in welded joints

Energy density zone model and fatigue life prediction considering microscopic effects

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