Slip-driven and weld pore assisted fatigue crack nucleation in electron beam welded TC17 titanium alloy joint

Liu, H.Q.; Song, Jun; Wang, Haomin; Yu, Chuanli; Du, Yu; He, Chao; Wang, Hongtao; Chen, Qiang

doi:10.1016/j.ijfatigue.2021.106525

Cited by 9 publications

(5 citation statements)

References 46 publications

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“…By employing a Weibull probability plot of the projected area of the initiation zone within the Murakami model, it becomes possible to make more accurate predictions regarding fatigue performance. The relationship between the failure probability F and

\sqrt{Area}

can be described as 21,33

italicln ((), italicln ((), \frac{1}{1 - F})) goodbreak= m italicln {\sqrt{((), Area)}}_{c} goodbreak- m italicln {\sqrt{((), Area)}}_{0},

where

m

represents the slope of the linear regression and

\sqrt{{((), Area)}_{c}}

and

\sqrt{{((), Area)}_{0}}

refer to the sizes of the crack initiation zone area and the average area, both of which are relevant to failure. In this method, the texture parameters that account for different orientations of the specimens are not considered.…”

Section: Discussionmentioning

confidence: 99%

“…21 By employing a Weibull probability plot of the projected area of the initiation zone within the Murakami model, it becomes possible to make more accurate predictions regarding fatigue performance. The relationship between the failure probability F and ffiffiffiffiffiffiffiffiffiffi Area p can be described as 21,33 ln ln…”

Section: Fatigue Performance Analysis Based On Fracture Mechanicsmentioning

confidence: 99%

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The effect of texture on the very high cycle fatigue performance and deformation mechanism of rolled AZ31B magnesium alloys

Zhan,

Wang,

Dai

et al. 2024

Fatigue Fract Eng Mat Struct

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Rolling can result in anisotropy in the microstructure and mechanical properties of the sheet material. This study focuses on the very high cycle fatigue (VHCF) performance of magnesium alloys in the rolling direction (RD), normal direction (ND), and the bisecting angle between the ND and RD (ND–RD). The findings reveal that RD specimens demonstrate superior fatigue performance, while the ND specimens exhibit the lowest fatigue resistance. During the crack initiation stage, the primary influential factor is the maximum shear stress. Due to c‐axis alignment with ND direction in grains, the deformation mode for ND and RD specimens primarily involves first‐order pyramidal slip, while ND–RD specimens primarily undergo basal slip and prismatic slip. In early stable crack propagation, grain size and texture cause variations in the morphology of the rough area among the three directional specimens. Notably, the RD specimens show faster crack propagation during crack initiation than early stable propagation stage.

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\sqrt{Area}

can be described as 21,33

italicln ((), italicln ((), \frac{1}{1 - F})) goodbreak= m italicln {\sqrt{((), Area)}}_{c} goodbreak- m italicln {\sqrt{((), Area)}}_{0},

where

m

represents the slope of the linear regression and

\sqrt{{((), Area)}_{c}}

and

\sqrt{{((), Area)}_{0}}

Section: Discussionmentioning

confidence: 99%

Section: Fatigue Performance Analysis Based On Fracture Mechanicsmentioning

confidence: 99%

The effect of texture on the very high cycle fatigue performance and deformation mechanism of rolled AZ31B magnesium alloys

Zhan,

Wang,

Dai

et al. 2024

Fatigue Fract Eng Mat Struct

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show abstract

“…We statistically analyze the area of the semi‐elliptic flat area and its projected area and utilize the Weibull probability plot of the semi‐elliptic flat area

\sqrt{A {rea}_{FA}}

and projected area

\sqrt{Area}

in the initiation site of the specimen based on the Murakami model 27 estimate the average failure size. The relationship between the failure probability F and

\sqrt{{italicArea}_{h}}

(

h

refers to the semi‐elliptic flat area or projected area) can be described as 28,29

\ln ((), \ln ((), \frac{1}{1 - F})) goodbreak= m \ln \sqrt{{((), {italicArea}_{h})}_{c}} goodbreak- m \ln \sqrt{{((), {italicArea}_{h})}_{0}}

…”

Section: Discussionmentioning

confidence: 99%

Effect of microstructure and local stress on small crack initiation and propagation paths in coarse‐grained FeCrAl alloys

Zhan,

Liu,

Dai

et al. 2023

Fatigue Fract Eng Mat Struct

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This study investigated the high cycle fatigue crack initiation and propagation behaviors in coarse‐grained FeCrAl alloys, with a focus on the relationship between the path of small cracks and the local microstructure. The results show that the small cracks initiate along the {100} slip plane due to the synthetical influence of local microstructure and shear stress. The initiation zone forms inclined areas with layered fine‐grain areas caused by cyclic shear stress. Quantitative analysis of the stress intensity factor (SIF) indicates that in the realm of mixed‐mode loading, the SIF of Mode I takes the lead in determining the intensity of stress and strain fields at the crack tip. As the crack propagates further, the SIF steadily increases. Once it reaches a specific threshold, the propagation mode within a coarse grain shifts from Mode II to Mode I. Moreover, fatigue life increases with a tendency for decreased SIF during crack deflection.

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“…Compared with the decreasing trend of the S-N curves of welded joints in high-cycle fatigue [4][5][6], the S-N curves of welded joints in VHCF exhibit a "bilinear" or "stepped" distribution [7,8]. This is due to the different fatigue fracture mechanisms from the surface to the interior of the specimen, which are closely related to the uneven distribution of defect sizes and differences in crystallographic characteristics [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Defect Characteristics on Prediction of Fatigue Life of TC4 Titanium Alloy Welded Joints

Guo,

Chen,

et al. 2023

Metals

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The size and depth of defects significantly affect fatigue performance; the main purpose of this article is to clarify the effect of stress correction factors caused by defects on the fatigue life of α + β Type titanium alloy welded joints. In order to investigate the fatigue characteristics of α + β Type titanium alloy welded joints, axial constant amplitude loading fatigue tests were performed with a stress ratio of −1. The test results show that the fatigue life continues to increase as the stress amplitude decreases, and the failure modes can be classified into two types: interior failure and surface failure. A fatigue parameter (λ) determined by both defect depth and size was proposed which allowed for a good generalization of the data point distribution in short and long-life regions. The stress correction factor (W) related to the S–N characteristics was constructed by combining the λ and average defect size, and it effectively improved the dispersion of the test data. Continuing, the fatigue life prediction model was established under the condition that the defect type and size can be estimated or detected on the basis of the dislocation energy method. The results indicated that the evaluated values of the new life model associated with W are in good agreement with the test results.

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Slip-driven and weld pore assisted fatigue crack nucleation in electron beam welded TC17 titanium alloy joint

Cited by 9 publications

References 46 publications

The effect of texture on the very high cycle fatigue performance and deformation mechanism of rolled AZ31B magnesium alloys

The effect of texture on the very high cycle fatigue performance and deformation mechanism of rolled AZ31B magnesium alloys

Effect of microstructure and local stress on small crack initiation and propagation paths in coarse‐grained FeCrAl alloys

The Effect of Defect Characteristics on Prediction of Fatigue Life of TC4 Titanium Alloy Welded Joints

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