The grain boundary effect on shock induced spallation of polycrystalline uranium

Luan, Dong-Lin; Wang, Yabin; Li, Muchao

doi:10.1016/j.ijmecsci.2022.107491

Cited by 15 publications

(2 citation statements)

References 45 publications

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“…The GBs have been acknowledged to play a crucial role in the mechanical properties of nanocrystalline materials. For example, GB-mediated plasticity is assumed to dominate the ductility and fracture behavior of nanocrystalline materials [ 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. Both intragranular and intergranular fracture behaviors were observed during tension, which can be highly dependent on grain sizes, GB characteristics, and loading conditions.…”

Section: Introductionmentioning

confidence: 99%

The Shock-Induced Deformation and Spallation Failure of Bicrystal Copper with a Nanoscale Helium Bubble via Molecular Dynamics Simulations

Shao

Wang

2023

Nanomaterials

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Both the nanoscale helium (He) bubble and grain boundaries (GBs) play important roles in the dynamic mechanical behavior of irradiated nanocrystalline materials. Using molecular dynamics simulations, we study the shock-induced deformation and spallation failure of bicrystal copper with a nanoscale He bubble. Two extreme loading directions (perpendicular or parallel to the GB plane) and various impact velocities (0.5–2.5 km/s) are considered. Our results reveal that the He bubble shows hindrance to the propagation of shock waves at lower impact velocities but will accelerate shock wave propagation at higher impact velocities due to the local compression wave generated by the collapse of the He bubble. The parallel loading direction is found to have a greater effect on He bubble deformation during shock compression. The He bubble will slightly reduce the spall strength of the material at lower impact velocities but has a limited effect on the spallation process, which is dominated by the evolution of the GB. At lower impact velocities, the mechanism of spall damage is dominated by the cleavage fracture along the GB plane for the perpendicular loading condition but dominated by the He bubble expansion and void growth for the parallel loading condition. At higher impact velocities, micro-spallation occurs for both loading conditions, and the effects of GBs and He bubbles can be ignored.

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Section: Introductionmentioning

confidence: 99%

The Shock-Induced Deformation and Spallation Failure of Bicrystal Copper with a Nanoscale Helium Bubble via Molecular Dynamics Simulations

Shao

Wang

2023

Nanomaterials

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“…The experimental spall fracture strength of polycrystalline materials typically demonstrates an inverse Hall–Petch effect in the μm to mm range. ,, However, complications arise when the size is reduced to the nm scale, as achieving such fine grain sizes inevitably introduces systematic errors in plate impact tests requiring large bulk materials. , Molecular dynamics simulation proves to be highly informative in this context, offering insights into the analogous size effect in the nanoregion. Xu , quantified and assessed three distinct regionsnormal, inverse, and extendedwith critical points at 25 and 9 nm in the Hall–Petch relationship of Al under 10 10 s –1 tensile loading.…”

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confidence: 99%

Synergy of Spall Strength and Toughness in Nanograined Metals

Zhu,

Qian,

Qiu

et al. 2024

Nano Lett.

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Under shock loading, the spall strength of nanocrystals exhibits intricate grain-size effects due to the presence of abundant grain boundary and dislocation activities. However, the influence of size on spall toughness and void evolution has been largely overlooked. This study employs molecular dynamics simulations to investigate the damage accumulation characteristics of nanocrystalline aluminum across various grain sizes. Unlike the trade-off observed in quasistatic loading conditions, our study reveals a consistency in which grain size governs both nanovoid nucleation and coalescence, yielding a novel spall strength− toughness synergy. These insights highlight grain sizes that are particularly susceptible to spall fracture, offering a crucial understanding of nanocrystal failure mechanisms in extreme environments.

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Molecular Dynamics Investigation of Shock-Induced Deformation Behavior and Failure Mechanism in Metallic Materials

Zhu,

Gong,

2024

Arch Computat Methods Eng

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The grain boundary effect on shock induced spallation of polycrystalline uranium

Cited by 15 publications

References 45 publications

The Shock-Induced Deformation and Spallation Failure of Bicrystal Copper with a Nanoscale Helium Bubble via Molecular Dynamics Simulations

The Shock-Induced Deformation and Spallation Failure of Bicrystal Copper with a Nanoscale Helium Bubble via Molecular Dynamics Simulations

Synergy of Spall Strength and Toughness in Nanograined Metals

Molecular Dynamics Investigation of Shock-Induced Deformation Behavior and Failure Mechanism in Metallic Materials

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