A concurrent multiscale study of dynamic fracture

Tong, Qi; Li, Shaofan

doi:10.1016/j.cma.2020.113075

Cited by 33 publications

(7 citation statements)

References 44 publications

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“…Fracture is a multi-scale phenomenon as it depends on different energy dissipation mechanisms, manifested at different dimension levels, in the material structure during crack evolution [ 32 ]. The following analysis focuses on the fracture macro- and micro-mechanisms of the HDPE nanocomposites.…”

Section: Resultsmentioning

confidence: 99%

Dynamic Fracture Resistance under Plane Strain Conditions of High-Density Polyethylene Nanoclay Composites

et al. 2023

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Polymer nanoclay composites have received significant attention due to their substantially enhanced mechanical, thermal and barrier properties. However, the effect of these nanoclays on the dynamic fracture resistance of a polymer matrix during fast fracture events has not been documented. In this study, the effect of nanoclay addition on the rapid crack propagation (RCP) resistance of high-density polyethylene (HDPE) was investigated through the high-speed double torsion test. Results showed that the addition of 1, 3, and 5% of nanoclays improved the dynamic fracture resistance under the plane strain conditions (Gd1) of HDPE up to 65%. An increase in the storage and loss modulus, and a decrease in crystallinity and melt flow index with nanoclay content was also found. Although the presence of agglomerates can hinder the enhancement of Gd1 as it promotes agglomerate fracture and debonding, the increase in energy consumption through fibrillation and crazing promoted by the nanoclay prevails, suggesting that the nanoclay’s toughening effect that has been extensively reported under quasi-static and impact tests, is also present under RCP conditions, and that the HDPE nanocomposites could be used in applications in which RCP must be prevented.

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Section: Resultsmentioning

confidence: 99%

Dynamic Fracture Resistance under Plane Strain Conditions of High-Density Polyethylene Nanoclay Composites

et al. 2023

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“…Although many of the continuum studies show a good agreement with atomistic simulations, the continuum models fail to address the lattice trapping effect frequently observed in experiments [33,34] and atomistic simulations [35]. To account for the discrete nature of lattice, atomistic simulations are used in conjunction with continuum models or concurrent continuum-atomistic models [27][28][29][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Crack mediated dislocation activities in Al/Ti nanolayered composites: an atomistic study

Maurya¹,

Chandra²,

Nie³

et al. 2022

Modelling Simul. Mater. Sci. Eng.

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In this work, to understand crack propagation in Al/Ti nanolayered composites, a series of molecular dynamic simulations were performed with crack in different layers of the nanolay- ered composites and subjected to mode-I loading. Nanolayered composite with a crack in Al layer, and monolithic Al show ductile fracture behavior that occurs by nucleation of Shockley partial dislocation at the crack tip. On the other hand, the fracture behavior in nanolayered composites with a crack in Ti shows crack bowing which is similar to the brittle fracture, and subsequent crack trapping at the interface. However, monolithic Ti shows typical cleavage fracture followed by activation of basal and pyramidal ⟨c + a⟩ slip that blunts the crack leading to ductile fracture. When the crack is in the Ti layer, the other Ti layers in a nanolayered composite deform by prismatic and pyramidal ⟨c + a⟩ slip. However, the Ti layer deforms only via slip on prismatic planes when the crack is in the Al layer. Critical strain energy release rate Gc based continuum analysis predicts the fracture mode in monolithic Ti correctly, but it fails to predict the fracture mode in monolithic Al and nanolayered composites with crack in the Al layer. It is found that the Gc determined based on external loading is marginally higher when the crack is in the Al layer as compared against the case when the crack is in the Ti layer. The Gc value for the basal and pyramidal slip in Ti is higher than the Gc value for cleavage. This poses an interesting phenomenon since the Gc in monolithic Al is found to be much lower than that of monolithic Ti. The reason is attributed to the constrained plasticity in the presence of an Al/Ti interface.

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“…Molecular dynamics (MD) simulations are successfully utilized to investigate tensile properties of nano-crystals such as ultimate tensile strength (

) and elastic modulus ( E ) [ 1 , 2 , 3 , 4 , 5 , 6 ]. Recently, cracked nano-crystals have been modeled by means of MD to investigate the fracture mechanics (FM) properties, which have been estimated for different nano-crystalline materials [ 7 , 8 , 9 , 10 , 11 , 12 ]. At the nanoscale, different methodologies have been proposed to evaluate fracture toughness by means of MD simulations of cracked nano-crystals [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ].…”

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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A concurrent multiscale study of dynamic fracture

Cited by 33 publications

References 44 publications

Dynamic Fracture Resistance under Plane Strain Conditions of High-Density Polyethylene Nanoclay Composites

Dynamic Fracture Resistance under Plane Strain Conditions of High-Density Polyethylene Nanoclay Composites

Crack mediated dislocation activities in Al/Ti nanolayered composites: an atomistic study

Fracture Toughness Estimation of Single-Crystal Aluminum at Nanoscale

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