Atomic-scale mode separation for mixed-mode intergranular fracture in polycrystalline metals

Trong, Nghia; Phi, Phuoc Quang; Nguyen, Vinh Phu; Choi, Seung Tae

doi:10.1016/j.tafmec.2018.03.014

Cited by 7 publications

(2 citation statements)

References 54 publications

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“…However, the fracture toughness is established modeling a nano-crystal with a specific crack length and geometry that change from one investigation to other, therefore a fracture toughness that depends on the crack size is obtained, instead of a unique value that only depends on the material properties. The J -integral ( J ) is also an energy method that is extensively used to measure the fracture toughness [ 27 , 28 , 29 ]. Nevertheless, as other energy parameters, J lacks accuracy when irreversibility such as dislocations appear in the MD simulation [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

Fracture Toughness Estimation of Single-Crystal Aluminum at Nanoscale

et al. 2021

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In this publication, molecular dynamics simulations are used to investigate the fracture behavior of single-crystal aluminum. The stress intensity factor is estimated by means of four different methods, the accuracy is assessed for each approach and the fracture toughness is estimated. The proposed methodology is also applied to estimate the fracture toughness for graphene and diamond using published data from other scientific articles. The obtained fracture toughness for the single-crystal aluminum is compared with other nanomaterials that have similar microstructures. Dislocation emission during the fracture simulation of the cracked nano-crystal of aluminum is analyzed to study the fracture behavior. Brittle fracture behavior is the predominant failure mode for the nanomaterials studied in this research.

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Section: Introductionmentioning

confidence: 99%

Fracture Toughness Estimation of Single-Crystal Aluminum at Nanoscale

et al. 2021

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“…However, the SBFEM fails to capture the nonlinearity brought by the cohesive interactions within the FPZ. Therefore, the mesoscale and atomic-scale-inserted CZMs were developed to model the FPZ [15][16][17][18]. However, the predetermined fracture paths often cause computational complexities and inaccuracies.…”

Section: Introductionmentioning

confidence: 99%

A Nonlinear Crack Model for Concrete Structure Based on an Extended Scaled Boundary Finite Element Method

Gao

et al. 2018

Applied Sciences

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Fracture mechanics is one of the most important approaches to structural safety analysis. Modeling the fracture process zone (FPZ) is critical to understand the nonlinear cracking behavior of heterogeneous quasi-brittle materials such as concrete. In this work, a nonlinear extended scaled boundary finite element method (X-SBFEM) was developed incorporating the cohesive fracture behavior of concrete. This newly developed model consists of an iterative procedure to accurately model the traction distribution within the FPZ accounting for the cohesive interactions between crack surfaces. Numerical validations were conducted on both of the concrete beam and dam structures with various loading conditions. The results show that the proposed nonlinear X-SBFEM is capable of modeling the nonlinear fracture propagation process considering the effect of cohesive interactions, thereby yielding higher precisions than the linear X-SBFEM approach.

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