Uniaxial tension-induced fracture in gold nanowires with the dependence on size and atomic vacancies

2014 ◽  
Vol 16 (45) ◽  
pp. 24716-24726 ◽  
Author(s):  
Fenying Wang ◽  
Yanfeng Dai ◽  
Jianwei Zhao ◽  
Qianjin Li
Keyword(s):  
Size Effect ◽  
Uniaxial Tension ◽  
Single Layer ◽  
Gold Nanowires ◽  
Crystalline Plane

The size effect dominates the rupture of gold nanowires, which is also related to atomic vacancies in a single-layer crystalline plane.

Influence of Atomic Defect on the Deformation Properties of Nanowires Subjected to Uniaxial Tension

2013 ◽  
Vol 873 ◽  
pp. 139-146
Author(s):  
Fen Ying Wang ◽  
Wei Sun ◽  
Yan Feng Dai ◽  
Yi Wang Chen ◽  
Jian Wei Zhao ◽  
...  
Keyword(s):  
Single Layer ◽  
Gold Nanowires ◽  
Brittle Deformation ◽  
Vacancy Defects ◽  
Deformation Properties ◽  
Atomic Vacancy ◽  
Dynamics Simulations ◽  
Mechanical Strengths ◽  
Crystalline Plane ◽  
Oriented Single Crystal

Atomic defects play an important role in the brittle deformation of nanowires at low temperatures. With molecular dynamics simulations, we study the influence of vacancy defects on the deformation and breaking behaviors of [10 oriented single-crystal gold nanowires at 50 and 150 K. The size of the nanowire is 10a × 10a × 30a (a stands for lattice constant, 0.408 nm for gold). It is shown that good crystalline structure appears in the whole deformation process, and it is in a brittle way at low temperature. The nanowire breaking behavior is sensitive to atomic vacancies when the atomic vacancy ratio is 1% in single-layer crystalline plane. Within the limitation of vacancy-induced breaking of the nanowire, the mechanical strengths increase under atomic vacancies. However, it decreases with the defect ratio increasing.

Fracture of B2 Aluminide Single Crystals

1990 ◽  
Vol 213 ◽  
Author(s):  
Kehi-Minn Chang ◽  
R. Darolia ◽  
H.A. Lipsitt
Keyword(s):  
Crystal Lattice ◽  
Single Crystals ◽  
Uniaxial Tension ◽  
Crack Growth ◽  
Cleavage Fracture ◽  
Fracture Behavior ◽  
Cleavage Plane ◽  
Model Based ◽  
Bend Tests ◽  
Crystalline Plane

ABSTRACTSingle crystals of B2 aluminides, including FeAl, NiAl, and CoAl, were tested to investigate their fracture behavior. Specimens were aligned along specific orientations of the crystal lattice. Both uniaxial tension and notched bend tests revealed a cleavage fracture in all crystals. The cleavage occurred along a specific crystalline plane: {100} for FeAl; {110} for NiAl and CoAl. A model based on the ordering energy of unlike atoms is proposed to explain the preferred cleavage plane in these B2 structures. Fracture on transient planes around {115} are observed in NiAl before the crack growth continues on a cleavage plane.

Mechanical behavior of single layer MoS2 sheets with aligned defects under uniaxial tension

2021 ◽  
Vol 130 (12) ◽  
pp. 124302
Author(s):  
Yekun Han ◽  
Peijian Chen ◽  
Jiaming Zhu ◽  
Hao Liu ◽  
Yingying Zhang
Keyword(s):  
Mechanical Behavior ◽  
Uniaxial Tension ◽  
Single Layer

scholarly journals Size Effect and Material Property Effect of the Impactor on the Damage Modes of the Single-Layer Kiewitt-8 Reticulated Dome

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Li Lin ◽  
Feng Fan ◽  
XuDong Zhi ◽  
HongFeng Yin
Keyword(s):  
Size Effect ◽  
Material Property ◽  
Single Layer ◽  
Space Structures ◽  
Large Space ◽  
Large Space Structures ◽  
The Subject ◽  
Global Collapse ◽  
The Difference ◽  
The Impact

The dynamic response of large space structures under accidental impact has been the subject of intense research since the occurrence of the 9/11 incident. In the present paper, using the 3D ANSYS/LS-DYNA, size effect and material property effect of the impactor on the damage modes of the single-layer Kiewitt-8 reticulated dome were investigated, respectively, where the impactor was the cylinder and the impact direction was vertical. Firstly, analytical results with the rigid impactor indicated that the impactor size can change the damage mode of the reticulated dome. It was found that the probability happening to the global collapse has an obvious rise with the size increase of the impactor. Furthermore, the deformable impactor was considered to figure out the difference with the rigid impactor; the comparisons indicated that the deformable impactor, which has the same mass and the same striking velocity with the rigid impactor, can contribute to the occurrence of the global collapse at a certain initial striking condition.

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