The crack growth and expansion characteristics of Fe and Ni using quasi-continuum method

Qiu, Rui; Lin, Yi-Chen; Fang, Te‐Hua; Tsai, Liren

doi:10.1088/2053-1591/aa60db

Cited by 7 publications

(7 citation statements)

References 31 publications

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“…The force did not start to decrease until the appearance of the slip in the third loading process. In our previous study [14], we showed that the stress varied with different crack lengths and the orientation plays an important role for the materials, which is in good agreement with the discussion above.…”

Section: Resultssupporting

confidence: 91%

“…In the QC method, representative atoms are primarily used for calculation instead of all atoms, considerably decreasing the degrees of freedom and enhancing the simulation efficiency [14,19]. …”

Section: Methodsmentioning

confidence: 99%

“…The relationship between the loading force and microstructure variation around the crack tip during the fatigue crack growth for BCC-Fe and FCC-Ni in different orientations has rarely been discussed simultaneously. In our previous study [14], the variation of the crack propagation in Fe and Ni during tensile processes with single orientation and different crack lengths and orientations is described. Hence, it is interesting to investigate the comparison of the crack growth behavior and slip system in Fe and Ni under a cyclic loading of tension or shear.…”

Section: Introductionmentioning

confidence: 99%

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

Qiu¹,

Lin²,

Fang³

2018

Beilstein J. Nanotechnol.

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A quasi-continuum (QC) method based on the embedded atom method (EAM) potential was employed to investigate the fatigue crack growth and expansion characteristics of single-crystal Fe and Ni under cyclic loading modes I and II. In particular, the crack growth and expansion characteristics of Fe and Ni under cyclic loading were evaluated in terms of atomic stress fields and force–distance curves. The simulation results indicated that under cyclic loading, the initially damaged area of the crack will coalesce again after compression or shear to the initial geometry leading to a strengthening of the material. If no coalescence appears, the crack spreads rapidly and the material breaks. Moreover, under the cyclic loading of shear at any orientation, the slip dislocation observed in the materials considerably affects the release of stress.

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Section: Resultssupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Qiu¹,

Lin²,

Fang³

2018

Beilstein J. Nanotechnol.

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“…The major goal of this method is to efficiently treat the continuous model while maintaining its accuracy [33][34][35][36][37][38][39][40][41][42][43][44]. The multiscale simulation we used for investigating the nano-punching processing was the quasicontinuum (QC) method, which has been extensively studied in recent decades [45][46][47][48][49][50]. Wu et al used the QC method to simulate the fracture and cracking of metallic bilayer materials and found that those materials have lower mechanical strength at a specific structural orientation [51].…”

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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“…However, the simulation of localized deformation and fracture in heterogeneous systems requires the use of relatively large systems and appropriate boundary conditions, which may result in system sizes difficult to access using direct MD due to the very time-consuming. The quasicontinuum (QC) method is a multi-scale combined MD approach (Tadmor et al 1996a, b;Qiu et al 2017;Fang et al 2016) that mixed continuum and atomistic approach for simulating the mechanical response of the crystal materials. The previous QC simulation of the cold welding into T junctions (Wu et al 2018) found that, at a small contact interference of 0-1 nm, the ultimate stress of welded pairs is independent of the magnitude of contact interference.…”

Section: Introductionmentioning

confidence: 99%

Nanowelding of nickel and copper investigated using quasi-continuum simulations

Fang

Lin

et al. 2018

Multiscale and Multidiscip. Model. Exp. and Des.

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The effects of contact interference, crystal orientation, and material type on the cold nanowelding mechanism and mechanics are studied using quasi-continuum simulations. These effects are investigated in terms of atomic trajectories, strain distribution, and the stress-strain curve. The simulation results show that welding using a contact interference of 0 nm leads to the formation of the fewest defects inside the material during cold welding, and that the number of defects increases with increasing contact interference. For the Ni-Ni welding pair, welding using a contact interference of 0 nm with the structural orientation [110] versus [001] has the largest ultimate strength and longest elongation during tensile testing due to the formation of fewer defects during welding. The welding quality obtained with the Ni-Ni welding pair is higher than that obtained with Ni-Cu and Cu-Cu welding pairs. During the tensile deformation process, dislocations nucleate from the free surface, propagate along the close-packed plane, and then terminate at the other free surface.

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The crack growth and expansion characteristics of Fe and Ni using quasi-continuum method

Cited by 7 publications

References 31 publications

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

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

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

Nanowelding of nickel and copper investigated using quasi-continuum simulations

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