Analysis of multiaxial low cycle fatigue of notched specimens for type 316L stainless steel under non-proportional loading

Gallo, Pasquale; Bressan, Stefano; Morishita, Takahiro; Itoh, Takamoto; Berto, Filippo

doi:10.1016/j.tafmec.2017.01.009

Cited by 18 publications

(5 citation statements)

References 36 publications

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“…Crack initiation site was found to be shifted from the notch tip in 316LSS notched specimens analyzed in a previous study [46]. A successive study conducted on those specimens by Gallo et al [50] from a sophisticated FEM model, evidenced that the shift of the crack initiation site was caused by particular strain gradients. Additional hardening process due to the application of a non-proportional loading path has been detected as the cause of those strain gradients.…”

Section: Crack Analysismentioning

confidence: 79%

“…In a previous work, the result of the application of I-S parameter on notched specimens has been compared with the data of smooth specimen, giving good results. [46,47,50]. However, the design phase requires a model that allows to calculate the number of cycles to failure.…”

Section: Itoh-sakane Parametermentioning

confidence: 99%

“…Eq. (13) has been employed only for 316LSS stainless steel notched specimens [46,50]. In these studies, the results for notched specimens has been compared with data of smooth specimens.…”

Section: Itoh-sakane Parametermentioning

confidence: 99%

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Influence of Notch Sensitivity and Crack Initiation Site on Low Cycle Fatigue Life of Notched Components under Multiaxial Non-proportional Loading

Bressan

Itoh

Berto

2018

Frattura Ed Integrità Strutturale

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A series of strain controlled multiaxial low cycle fatigue (LCF) tests under proportional and non-proportional loading conditions have been conducted on notched specimens. Cylindrical bars of Al 6061 aluminum alloy and AISI 316L stainless steel with four values of stress concentration factors referred to the net section Kt,n were employed. The experimental results evidenced a reduction of fatigue life due to non-proportional loading. Furthermore, the crack initiation site has been detected to be moved from the notch tip in the case of steel for high values of notch radius under nonproportional loading. Stress concentration factor evaluated in the elastic field K t,n has been included in the Itoh-Sakane parameter to evaluate the fatigue life, returning a general underestimation of fatigue life especially for high values of Kt,n. Material notch sensitivity and crack initiation position have been taken into account to further modify the model, improving the original results and showing a better assessment.

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Section: Crack Analysismentioning

confidence: 79%

Section: Itoh-sakane Parametermentioning

confidence: 99%

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Influence of Notch Sensitivity and Crack Initiation Site on Low Cycle Fatigue Life of Notched Components under Multiaxial Non-proportional Loading

Bressan

Itoh

Berto

2018

Frattura Ed Integrità Strutturale

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“…Stainless steels are primarily designed for corrosion resistance, yet many possess considerable strength, particularly the martensitic type, making them applicable in load-bearing applications. Among the several stainless steels of which the multiaxial fatigue behaviour has been studied, both experimentally and theoretically, 316 and 304 grades take the lead [10][11][12][13][14]. However, other stainless steels with equally good mechanical strength are found in applications where failure can result from fatigue.…”

Section: Introductionmentioning

confidence: 99%

Effect of phase angle on the cyclic behavior of AISI 410 alloy

2019

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Multiaxial strain-controlled fatigue tests were conducted on AISI 410 according to ASTM 2207-E08 [1] under proportional (phase angle,  = 0º) and non-proportional (phase angle,  = 90º) loadings. Axial strain amplitudes in the range of 0.2%-0.35% are paired with shear strain amplitudes in the range of 0.25%-0.5%. Comparison was made between the hysteresis loops under both loading modes. It was found that peak stresses are higher under nonproportional loading, but with less plastic deformation. Additional stress hardening is exhibited by the alloy, resulting in the tip of the hysteresis loop under nonproportional loading to be rounded. Stress evolution with the number of fatigue cycles, mainly show cyclic stress softening except in axial stress under nonproportional loading where stress stabilization is largely the case after initial hardening. Fatigue life under nonproportional loading is generally lower than that of proportional loading.

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“…The state of the art clearly shows that the fatigue problem of mechanical components characterised by geometrical irregularities (such as notches, fillets and key-sets) has widely been examined in order to propose reliable methodologies for estimating the fatigue strength/lifetime under both uniaxial and multiaxial loadings [1][2][3][4][5][6][7][8].…”

mentioning

confidence: 99%

Fatigue lifetime evaluation of notched components: Implementation of the control volume concept in a strain-based LCF criterion

Vantadori

Fortese

Ronchei

et al. 2018

Theoretical and Applied Fracture Mechanics

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The goal of the present paper is to discuss the reliability of a strain-based multiaxial Low-Cycle Fatigue (LCF) criterion, recently proposed by some of the present authors, in estimating the fatigue lifetime of metallic structural components weakened by sharp notches. Such a criterion, based on the critical plane approach, is formulated according to the control volume concept related to the Strain Energy Density (SED) criterion: a material point located at a certain distance from the notch tip is assumed to be the verification point where to perform the fatigue assessment. The above distance is assumed to be a function of both the biaxiality ratio (applied shear stress amplitude over normal stress amplitude)  phase angle between transversal normal strain t  and axial normal strain z  ur  , ut  , uz  direction cosines of u -axis vr  , vt  , vz  direction cosines of v -axis wr  , wt  , wz  direction cosines of w -axis  phase angle between shear strain zt  and axial normal strain z  a  Manson-Coffin shear strain amplitude zt  shear strain  angle between the averaged principal strain direction 1 and the normal w to the critical plane

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Analysis of multiaxial low cycle fatigue of notched specimens for type 316L stainless steel under non-proportional loading

Cited by 18 publications

References 36 publications

Influence of Notch Sensitivity and Crack Initiation Site on Low Cycle Fatigue Life of Notched Components under Multiaxial Non-proportional Loading

Influence of Notch Sensitivity and Crack Initiation Site on Low Cycle Fatigue Life of Notched Components under Multiaxial Non-proportional Loading

Effect of phase angle on the cyclic behavior of AISI 410 alloy

Fatigue lifetime evaluation of notched components: Implementation of the control volume concept in a strain-based LCF criterion

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