Defect size map for cast A357-T6 component under multiaxial fatigue loading using the Defect Stress Gradient (DSG) criterion

Rotella, Antonio; Nadot, Y.; Augustin, Rémi; Piellard, Mickaël; L’Heritier, Sylvain

doi:10.1016/j.engfracmech.2016.12.008

Cited by 10 publications

(5 citation statements)

References 28 publications

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“…This criterion describes the impact of the defect through the local stress gradient that the defect creates at the local scale. The DSG criterion describes the effect of morphology [22,23], multi-axial loading, including load ratio effect [24], and has been improved with the analytical Eshelby theory [17] that allows the criterion to be applied as a post treatment of a Finite Element (FE) computation of complex parts in order to plot defect size maps [25]. The criterion has been tested on several materials: cast Ti64, cast A345T6, cast A357T6, nodular cast iron, cast Inconel 718, 1045 steel, and ARMCO iron, and has shown good results when the identification procedure carefully accounts for the defect type.…”

Section: Modeling the Impact Of Defects On Fatigue Limitmentioning

confidence: 99%

Predicting the fatigue life of an AlSi10Mg alloy manufactured via laser powder bed fusion by using data from computed tomography

Nadot

Nadot-Martin

Kan

et al. 2020

Additive Manufacturing

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Section: Modeling the Impact Of Defects On Fatigue Limitmentioning

confidence: 99%

Predicting the fatigue life of an AlSi10Mg alloy manufactured via laser powder bed fusion by using data from computed tomography

Nadot

Nadot-Martin

Kan

et al. 2020

Additive Manufacturing

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“…21,23,36,37 In particular, it can be pointed out that Ueno's equation (Equation 2) appositely introduced for aluminium cast alloys is less conservative than Murakami's one. 21,23,36,37 In particular, it can be pointed out that Ueno's equation (Equation 2) appositely introduced for aluminium cast alloys is less conservative than Murakami's one.…”

Section: Shrinkage Porosity Consists In Interdendritic Cavitiesmentioning

confidence: 99%

“…The results allow to draw that, although the maximum Feret diameter shows a non-negligible scatter, the endurance limits found in the differently stressed area show a narrow dispersion: σ w is calculated between 75 and 90 MPa, which confirms the evaluations available in literature. 21,23,36,37 In particular, it can be pointed out that Ueno's equation (Equation 2) appositely introduced for aluminium cast alloys is less conservative than Murakami's one.…”

Section: Shrinkage Porosity Consists In Interdendritic Cavitiesmentioning

confidence: 99%

“…22 Only a few papers consider the real component to be tested in order to take into account also the effect of complex geometry inducing local stress concentrators. [23][24][25][26] However, until now, in the published papers about the fatigue behaviour of castings, fatigue tests have been never carried out directly on the whole wheel tested in the final painting condition and therefore considering the effect due to the effective residual stress distribution induced by the production process on the component.…”

Section: Introductionmentioning

confidence: 99%

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A356‐T6 wheels: Influence of casting defects on fatigue design

Tebaldini

Petrogalli

Donzella

et al. 2018

Fatigue Fract Eng Mat Struct

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Rotating bending fatigue tests were executed on A356‐T6 wheels. The tests were performed both on components containing only the casting defects and on wheels in which artificial holes were machined. Results show the detrimental effect of sub‐superficial porosities on fatigue endurance. A predictive model was proposed. It resulted in a useful tool for the designer because knowing the applied stress, it is possible to estimate the number of cycles for crack nucleation considering the size of the defect, whereas knowing the endurance target requested it is possible to find the maximum defect size acceptable considering the applied stress.

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“…Besides, the proposed analytical expressions are applied to predict the stress concentration factors (SCFs derived analytical formulas for the modelling of the surface topography in the fatigue assessment process based on the theory of critical distance. Rotella et al [4] plotted a defect size map based on FE-calculations for cast A357-T6 under multiaxial loading using the defect stress gradient (DSG) criterion.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Design of Ferritic-Pearlitic Nodular Cast Iron Components with Surface Discontinuities

Gróza

Váradi

2018

SV-JME

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Surface and subsurface discontinuities are one of the most important factors affecting the fatigue life of structural cast components. Their location, shape and size vary from component to component, most of them are completely harmless, but one critical defect can lead to inservice failure. Allowable surface discontinuity size finite element (FE) results can be a practical engineering tool for casting design, process planning, and the quality inspection process. Different methods based on the continuum and fracture mechanics applicable on the multiaxial high-cycle fatigue (HCF) and fatigue limit prediction for components with surface discontinuities are compared with experimental results on ISO1083/JS/500-7 nodular cast iron (NCI). Results also confirm, that the fatigue properties of the analysed material in standards truly represent low-end material strength. A design methodology is presented based on the Defect Stress Gradient approach for the display of an allowable surface discontinuity size FE-result for complex components under proportional loading conditions in HCF. Highlights• Fatigue test results for the ISO1083/JS/500-7 NCI material grade with and without surface discontinuities are compared and analysed. • Different methods are applied to describe the reduction of fatigue strength with the equivalent surface discontinuity size. • Allowable surface discontinuity size FE-results are plotted based on the DSG approach with the consideration of the meanstress dependent scatter in the fatigue strength. • The proposed method to obtain allowable surface discontinuity size results is directly applicable in industrial applications.

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Defect size map for cast A357-T6 component under multiaxial fatigue loading using the Defect Stress Gradient (DSG) criterion

Cited by 10 publications

References 28 publications

Predicting the fatigue life of an AlSi10Mg alloy manufactured via laser powder bed fusion by using data from computed tomography

Predicting the fatigue life of an AlSi10Mg alloy manufactured via laser powder bed fusion by using data from computed tomography

A356‐T6 wheels: Influence of casting defects on fatigue design

Fatigue Design of Ferritic-Pearlitic Nodular Cast Iron Components with Surface Discontinuities

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