Fatigue crack growth characteristics of Fe and Ni under cyclic loading using a quasi-continuum method

Qiu, Rui; Lin, Yi-Chen; Fang, Te-Hua

doi:10.3762/bjnano.9.93

Cited by 5 publications

(2 citation statements)

References 29 publications

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“…Dmitry et al [25] proposed a method for studying the shear deformation mechanism based on molecular dynamics simulation, which allows the consideration of the influence of crystal and geometric factors on the deformation mechanism. Qiu et al [26] indicated that under cyclic shear loading, the variations of the force-distance curve become steady after a certain number of cycles. Li et al [27] studied the crack growth and microstructure evolution of nickel alloys and found that the critical stress increases with the decrease of temperature and the increase of strain rate.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics study of fatigue behavior of nickel single-crystal under cyclic shear deformation and hyper-gravity condition

Xiao¹,

Deng²,

Ma³

et al. 2022

Modelling Simul. Mater. Sci. Eng.

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Dynamic mechanical properties play an essential role in governing the intrinsic fatigue behavior of superalloys. In this work, [001](010), [110](-110), and [101](010) pre-existing center cracks model of nickel single crystals under increasing cyclic shear deformations were studied by molecular dynamics simulations. More importantly, we introduced three hyper-gravity forces, i.e., 3⨯1012 g, 4⨯1012 g, and 5⨯1012 g, during the fatigue deformation to simulate the high-speed rotation of the blade. The stress intensity factor for the first dislocation nucleation indicates that the critical stress is strongly dependent on the hyper-gravity intensities and temperatures. The fatigue life decreased rapidly with the elevated hyper-gravity strength. Moreover, the [001](010) crack propagation shows a brittle-to-ductile transition at temperatures below 300 K and is suppressed at high temperatures. The crack length in the relation to hyper-gravity intensities is discussed and shows anisotropy along the direction of hyper-gravity. No crack propagation is observed in [110](-110) and [101](010) central crack models.

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Section: Introductionmentioning

confidence: 99%

Molecular dynamics study of fatigue behavior of nickel single-crystal under cyclic shear deformation and hyper-gravity condition

Xiao¹,

Deng²,

Ma³

et al. 2022

Modelling Simul. Mater. Sci. Eng.

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show abstract

“…The results showed that after compressive or shear processes, the materials were strengthened if the initial crack coalesces again. On the contrary, if there is no coalescence, the cracks will rapidly spread and lead to the fracture of the materials [ 53 ]. Overall, these studies have confirmed that the QC method has been successfully applied in the fields of nanoscale simulations.…”

Section: Introductionmentioning

confidence: 99%

Bending and punching characteristics of aluminum sheets using the quasi-continuum method

Chang¹,

Lin²,

Fang³

2022

Beilstein J. Nanotechnol.

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The nano-punching characteristics of single-crystalline aluminum are investigated using the quasi-continuum (QC) method. Four variables (i.e., crystal orientation, workpiece thickness, clearance between the punch and the substrate, and the taper angle of punch) are used to explore their effect during the nano-punching process. The shear stress distribution is used to express the punching effect on the punch and on both sides of the substrates. Besides, fracture strength, residual flash, and the atomic displacement vector are observed and discussed regarding the behaviors of the nano-punching process under various conditions. Based on the results, the Al workpiece with the X[111]Y[−110] orientation presents less lattice resistance during the punching process. Besides, the thickness of the workpiece has a significant effect on the punching quality. Workpieces with thickness values of 5 and 10 Å are more suitable for punching, due to stable loading and unloading stress–displacement curves and less residual flash on the cutting surfaces of these workpieces. In contrast, the effect of clearance has less impact on the punching behaviors of thinner workpieces. However, for thicker workpieces (i.e., 15 and 20 Å), a larger clearance will likely cause more residual flash. Furthermore, the taper angle of the punch should not be larger than 10°, otherwise, it might damage the workpiece and the substrate.

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Collision dependent silver nucleation regulated by chemical diffusion and reaction

Dou

Huang

Wang

et al. 2022

Chemical Engineering Science

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Fatigue crack growth characteristics of Fe and Ni under cyclic loading using a quasi-continuum method

Cited by 5 publications

References 29 publications

Molecular dynamics study of fatigue behavior of nickel single-crystal under cyclic shear deformation and hyper-gravity condition

Molecular dynamics study of fatigue behavior of nickel single-crystal under cyclic shear deformation and hyper-gravity condition

Bending and punching characteristics of aluminum sheets using the quasi-continuum method

Collision dependent silver nucleation regulated by chemical diffusion and reaction

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