Tensile overload-induced plastic deformation and fatigue behavior in weld-repaired high-strength low-alloy steel

Zhang, Chunguo; Hu, Xiaozhi; Lü, Peng; Zhang, Gaiping

doi:10.1016/j.jmatprotec.2013.05.018

Cited by 15 publications

(9 citation statements)

References 18 publications

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“…29 In our previous study, an alternative method was proposed by measuring the plastic deformation in the direction of the thickness along the fatigue-crack growth path. 10 We found that the plastic deformation has a linear decrease with an increase of the distance from the OL point, and covers all the stages (region šO -C' in Figure 2).…”

Section: Relation Between Crack Growth Rate and Fracture Surfacementioning

confidence: 60%

“…Obviously, the magnitude of the OL-induced FZ was closely pertinent to K app just before OL. 10 For the 1 st and 2 nd OLs (corresponding to the lower and higher K app ), the OL-induced FZ increases with an increase of the K OL / K app ratio.…”

Section: Relation Between Crack Growth Rate and Fracture Surfacementioning

confidence: 92%

“…In our previous research, the OL-induced fracture zone at the crack tip was found to be a significant factor in accelerating da/dN. 10 This study aims at addressing the following key questions:…”

Section: Introductionmentioning

confidence: 97%

“…8 The prevailing view on the trend of the variation in da/dN after a single tensile OL during a constant amplitude fatigue test is: initial acceleration, subsequent retardation and final recovery. 9,10 In order to explore the experimental phenomenon, a deep theoretical and experimental study on the effect of OL on fatigue behavior has been carried out. [11][12][13] The authors found that the OL-induced crack closure was the dominant factor in determining the subsequent da/dN.…”

Section: Introductionmentioning

confidence: 99%

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Trends in fatigue-crack growth for the 2024 Al-alloy after a single tensile overload

Zhang¹,

Lei²,

Liu³

et al. 2018

Mater. Tehnol.

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A single tensile overload (OL) applied during a constant amplitude fatigue test could have a positive or negative influence on improving the subsequent fatigue-crack growth rate (da/dN). The resulting variation in da/dN was very relevant to both the OL level and the fatigue loading conditions. Comprehensive tests on 2024-T4 Al-alloy specimens were carried out to rationalize the variation trend of da/dN after a single tensile OL. It was found that the trend of the fatigue-crack growth after the OL is not unique, but strongly depends on the OL stress-intensity factor KOL and the applied stress-intensity factor Kapp just before OL. Three potential trends of variation in da/dN, related to both the KOL and the KOL/Kapp ratio, were proposed in this study: initial deceleration and then recovery (Type I); initial slight-acceleration, subsequent retardation and final recovery (Type II); and initial major-acceleration, subsequent retardation and final recovery (Type III). Among the three types, the type II with the medium KOL/Kapp ratio and the low Kapp is the optimal OL type for improving the fatigue life of a 2024-T4 Al-alloy specimen. Keywords: overload, fatigue crack growth trend, fatigue retardation, overload-induced fracture zone Med testom utrujanja s konstantno amplitudo so uporabili posamezen natezni preizkus s preobremenitvijo (OL; angl.: single tensile overload) ter ugotovili, da ima lahko le-ta pozitiven ali negativen vpliv na nadaljnjo hitrost rasti razpoke (da/dN). Nastala razlika v da/dN je bila tesno povezana tako z nivojem OL kot tudi s pogoji utrujanja. Avtorji~lanka so izvedli ob{irne preizkuse na vzorcih Al zlitine 2024-T4, da bi razumeli trend variiranja da/dN po OL. Ugotovili so, da trend hitrosti rasti razpoke po OL ni enoten, temve~je mo~no odvisen od razmerja OL-faktor intenzitete napetosti KOL in uporabljenega nivoja napetostnega faktorja intenzitete Kapp tik pred OL. V tej {tudiji so avtorji predlagali tri mo`ne trende variiranja da/dN glede na KOL in razmerje KOL/Kapp: za~etno zmanj{evanje hitrost (zaviranje) in nato popravo (Type I); za~etno rahlo pospe{evanje, odla{anje in nato popravo (Type II) in za~etno izrazito pospe{evanje, kateremu je sledilo odla{anje in kon~na poprava (Type III). Med vsemi tremi je tip II s srednjim KOL/Kapp razmerjem in nizkim Kapp optimalen OL tip za izbolj{anje dobe trajanja vzorcev iz Al zlitine 2024-T4. Klju~ne besede: preobremenitev, trend rasti utrujenostne razpoke, odla{anje utrujanja, s preobremenitvijo inducirana cona loma

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Section: Relation Between Crack Growth Rate and Fracture Surfacementioning

confidence: 60%

Section: Relation Between Crack Growth Rate and Fracture Surfacementioning

confidence: 92%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Trends in fatigue-crack growth for the 2024 Al-alloy after a single tensile overload

Zhang¹,

Lei²,

Liu³

et al. 2018

Mater. Tehnol.

View full text Add to dashboard Cite

show abstract

“…1 The investigation of crack-growth retardation is a significant subject for increasing the remaining lives of cracked structural components. 2 There are a number of methodologies of delaying or arresting crack growth to extend the fatigue lives of cracked components, such as welding repair, 3,4 tensile overload(s), [5][6][7] shot peening, [8][9][10][11][12] indentation, 13,14 and deposition. 15 Beyond that, drilling a round hole in the vicinity of fatigue crack-tip, often named the stophole method, is one of the most effective and the easiest crack-growth arresting or retardation techniques for cracked components, 16,17 which is more effective than infiltration and safer than applying an overload.…”

Section: Introductionmentioning

confidence: 99%

Effect of stop-hole-induced material removal on the fatigue properties of cracked DT4C steel

Zhang¹,

Liu²,

Liu³

et al. 2019

Mater. Tehnol.

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There is a lack of a quantitative study on the appropriate value of material removal Lr from the crack-tip front induced by drilling a stop-hole. The effect of Lr variation on the fatigue life and post-initiation fatigue crack growth rate (da/dN) of a cracked specimen was studied for two different stop-hole geometries (circle and ellipse). Three different values of Lr = 0.3, 0.6 and 0.9 mm were selected for the parametric study by changing the location of the stop-hole center in relation to the initial fatigue crack-tip. The results show that Lr = 0.6 mm results in the longest fatigue life and lowest post-initiation da/dN for all the specimens repaired by either circular or elliptical stop-holes. In addition, the fatigue-life extension and post-initiation da/dN reduction resulted from the elliptical stop-hole are significantly more than those of the circular stop-hole for the same Lr.

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Neutron diffraction residual stress analysis during fatigue crack growth retardation of stainless steel

Seo

Huang²,

Woo

et al. 2017

International Journal of Fatigue

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Tensile overload-induced plastic deformation and fatigue behavior in weld-repaired high-strength low-alloy steel

Cited by 15 publications

References 18 publications

Trends in fatigue-crack growth for the 2024 Al-alloy after a single tensile overload

Trends in fatigue-crack growth for the 2024 Al-alloy after a single tensile overload

Effect of stop-hole-induced material removal on the fatigue properties of cracked DT4C steel

Neutron diffraction residual stress analysis during fatigue crack growth retardation of stainless steel

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