Effect of dislocation blocking on fracture behavior of Al and α-Fe: a multiscale study

Noronha, S. J.; Farkas, Diana

doi:10.1016/j.msea.2003.09.022

Cited by 32 publications

(15 citation statements)

References 29 publications

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“…Atomistic simulations have been widely used to study the mechanical response of metallic materials, in particular, the structure and response of grain boundaries and dislocations and their role in fracture [10][11][12]. Simulation accuracy is dependent upon the interatomic potentials of the materials being studied, particularly for the emission of dislocations from grain boundaries [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Relationship between localized strain and irradiation assisted stress corrosion cracking in an austenitic alloy

McMurtrey

Was

Patrick

et al. 2011

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 99%

Relationship between localized strain and irradiation assisted stress corrosion cracking in an austenitic alloy

McMurtrey

Was

Patrick

et al. 2011

Materials Science and Engineering: A

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“…A dislocation is emitted from the source when τ res (z 01 ) exceeds a critical value. The friction shear stress, τ f , the material resistance against the dislocation movement, is used for the critical value in the same consideration as the other researchers (7), (8), (10) . When the dislocation emission criterion is satisfied, a new dislocation will be emitted and allowed to move away from the source.…”

Section: Dislocation Emission and Movement From The Crack Tipmentioning

confidence: 99%

“…The applied stress intensity factor for the macroscopic crack then is defined as the fracture toughness. Noronha and Farkas (10) carried out an investigation into the effect of dislocation blocking distances on fracture behavior. In this investigation, the cleavage fracture stress, σ f was determined by the net tensile stress caused by the macroscopic crack fields and the array of dislocations emitted from the crack.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Discrete Dislocation Dynamics Approach to Initiation of Cleavage Fracture under Short Pulse Loads

Tran

Homma

2009

JMMP

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Mode I crack initiation properties under stress intensity pulses with durations of 25, 50 and 100 µs are investigated by experiment and discrete dislocation dynamics. The cleavage fracture initiation is examined under the consideration of the pile-up of dislocations against an obstacle ahead of the crack tip and the coalescence of piled-up dislocations. In the experiment, under very short pulse loads with the duration of less than 50 µs, the dynamic fracture toughness, K Id remarkably increases and the crack tip opening displacement is closely correlated with K Id . The numerical results are compared with the experimental ones in reasonable agreement.

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“…NSMs include ultrafine-grained (UFG) materials [2], bimodal materials [3], and nanotwinned Cu [4]. To apply NSMs in high-strength, high-toughness structural components, we must understand their fracture phenomena [5][6][7]. Traditionally, fracture toughness is simply estimated from the relationship between the crack extension force and the resistance of the material [8].…”

Section: Introductionmentioning

confidence: 99%

Atomic-scale intergranular crack-tip plasticity in tilt grain boundaries acting as an effective dislocation source

Shimokawa

Tsuboi

2015

Acta Materialia

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The intergranular fracture toughness of plastic deformable crystalline materials is strongly controlled by the plastic work ahead of the intergranular crack tip. Therefore, in studies of intergranular fracture toughness, the grain boundaries (GBs) should be regarded as both a cleavage plane and dislocation source. Combining continuum analyses and atomic simulations, this study investigates the atomic-scale mechanism of intergranular crack tip plasticity in aluminum h1 1 2i tilt GBs as an effective dislocation source. To quantitatively predict the first plastic deformation near the intergranular crack tip, we first model the dislocation emission from the GBs ahead of the intergranular crack tip and analytically derive the critical stress intensity factor. If the predicted first plastic phenomenon is dislocation emission from the GBs, the resulting wedge disclination can shield the stress field near the crack. Dislocation emissions from the crack tip are accompanied by dislocation emissions from the GBs, despite the predicted difficulty of the latter. The lattice defect evolution nucleates a nanograin with a disclination at the triple-junction ahead of the crack tip, which can weaken the mechanical field near the crack tip. Consequently, when improving the intergranular fracture toughness of materials, the role of GBs as dislocation sources cannot be ignored.

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Effect of dislocation blocking on fracture behavior of Al and α-Fe: a multiscale study

Cited by 32 publications

References 29 publications

Relationship between localized strain and irradiation assisted stress corrosion cracking in an austenitic alloy

Relationship between localized strain and irradiation assisted stress corrosion cracking in an austenitic alloy

Experimental and Discrete Dislocation Dynamics Approach to Initiation of Cleavage Fracture under Short Pulse Loads

Atomic-scale intergranular crack-tip plasticity in tilt grain boundaries acting as an effective dislocation source

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