Failure of Graphdiyne: Structurally Directed Delocalized Crack Propagation

2013 ◽  
Vol 80 (4) ◽  
Author(s):  
Dieter B. Brommer ◽  
Markus J. Buehler
Keyword(s):  
Mechanical Properties ◽  
Crack Propagation ◽  
Failure Mechanisms ◽  
Fracture Analysis ◽  
Two Dimensional ◽  
Main Subject ◽  
Carbon Allotropes ◽  
Original Direction ◽  
Device Applications ◽  
The Many

Among the many potential two-dimensional carbon allotropes inspired by graphene, graphynes have received exceptional attention recently. Graphynes exhibit remarkable mechanical properties depending on their structure. The similar structure and two-dimensional nature of these materials yield many properties that are similar to those of graphene, but the presence of heterogeneous bond types is expected to lead to distinct properties. The main subject of this work is graphdiyne, one of the few graphynes that has been fabricated in large quantities. In this paper, we perform fracture analysis on graphdiyne and find a delocalized failure mechanism in which a crack propagates along a diagonal with respect its original direction. The covalence of the material allows for this simple but intriguing phenomenon to be investigated. Graphene is also tested to compare the behavior. This mechanism has implications for the toughness and robustness of this material, which is topical for many device applications recently proposed in the literature. Further, connections of such delocalized failure mechanisms are made to that of hidden length and sacrificial bonding in some biological systems such as proteins, bone, and nacre.

Probing the chirality-dependent elastic properties and crack propagation behavior of single and bilayer stanene

2018 ◽  
Vol 20 (35) ◽  
pp. 22768-22782 ◽  
Author(s):  
Avik Mahata ◽  
Tanmoy Mukhopadhyay
Keyword(s):  
Mechanical Properties ◽  
Crack Propagation ◽  
Elastic Properties ◽  
Two Dimensional ◽  
Propagation Behavior ◽  
The Family ◽  
Crack Propagation Behavior

Mechanical properties of stanene, a promising quasi-two-dimensional honeycomb-like nanostructure of tin belonging to the family of 2D-Xenes (X = Si, Ge, Sn), have been investigated in this paper.

Compressive Aggregates of Two-Dimensional Mono-Disperse to Assess Flaw Dissemination

2014 ◽  
Vol 353 ◽  
pp. 101-105 ◽  
Author(s):  
Sarunya Promkotra
Keyword(s):  
Crack Propagation ◽  
Failure Mechanisms ◽  
Small Scale ◽  
Two Dimensional ◽  
Particle Bonding ◽  
Cluster Shape ◽  
Structure Crack

Polystyrene particles of 4 μm in diameter are aggregated as the monolayer clusters rearranged themselves when the compressive forces are applied to the clusters. Oriented structures of the clusters are then examined and characterized the failure mechanisms of two-dimensional (2D) aggregation. Failure mechanisms cause rearrangement of particles within the aggregates. Their flaw locations of each applying force change due to the particle bonding-rebonding themselves. Particles can move either relatively to each other or the small aggregates. Even though, these orientations occur in the small scale and barely significant, disturbed particles gradually accumulate stress. Small aggregates or particles inside the bulk perhaps cannot immediately change the cluster shape, but regularly oriented until reaching to yield. Compression to 2D aggregates can make an existing dislocation and fractures of this aggregated structure. Crack propagation of the dense is possible to proceed dynamically. The clusters collapse until reaching to yield. Two-dimensional structures of compressive aggregated polystyrene are always mechanical instable that increases in propagating rupture. Therefore, the quake will reasonably occur.

scholarly journals A dynamical model of a crystal structure. II

1949 ◽  
Vol 196 (1045) ◽  
pp. 171-181 ◽  
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Shear Strain ◽  
Reasonable Agreement ◽  
The Body ◽  
Two Dimensional ◽  
Main Subject ◽  
Plastic Properties ◽  
Shear Strains ◽  
Low Shear

A quantitative study of the mechanical properties of two-dimensional bubble rafts has been made. The elastic properties have been used to check the theory of the interaction of the bubbles, and reasonable agreement is obtained. The plastic properties are the main subject of this paper. Plastic deformation proceeds by the motion of dislocations, and we have taken advantage of the possibility of making absolutely perfect crystalline rafts to study the production of dislocations. They are produced either in pairs in the body of the rafts, or singly from the edges. The shear strain required to produce them varies from 7° for bubbles of 2 mm. diameter to a fraction of a degree for bubbles of less than 0.5 mm. diameter. The analogy with metals is best for bubbles of about 1.2 mm. diameter; for these the critical shear strain is about 3°. The observed shear strains can be explained in terms of the forces between the bubbles, and so it seems that the very low shear strengths of metallic single crystals cannot be explained in terms of dislocation creation, but must be a consequence of the initial presence of faults of some kind.

A new two-dimensional all-sp3 carbon allotrope with indirect band gap and superior carrier mobility

2021 ◽  
Author(s):  
Xing Yang ◽  
Yuwei Wang ◽  
Ruining Xiao ◽  
Tao Wen ◽  
Yulin Shen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Band Gap ◽  
Carrier Mobility ◽  
Two Dimensional ◽  
Carbon Allotrope ◽  
Carbon Allotropes ◽  
Indirect Band Gap

The success of fascinating graphene has motivated much interest in exploiting new two-dimensional (2D) carbon allotropes with excellent electronic and mechanical properties such as graphdiyne and penta-graphene. However, there is...

Bubble-wrap carbon: an integration of graphene and fullerenes

Nanoscale ◽  
2018 ◽  
Vol 10 (24) ◽  
pp. 11328-11334 ◽  
Author(s):  
Wei Liu ◽  
Jing-yao Liu ◽  
Jing Xia ◽  
Hai-qing Lin ◽  
Mao-sheng Miao
Keyword(s):  
Mechanical Properties ◽  
Two Dimensional ◽  
Carbon Allotropes

Integration of graphene and fullerenes will generate a series of novel two-dimensional carbon allotropes possessing peculiar electronic and mechanical properties.

scholarly journals Three-Dimensional Thematic Map Imaging of the Yacht Port on the Example of the Polish National Sailing Centre Marina in Gdańsk

2021 ◽  
Vol 11 (15) ◽  
pp. 7016
Author(s):  
Pawel S. Dabrowski ◽  
Cezary Specht ◽  
Mariusz Specht ◽  
Artur Makar
Keyword(s):  
Spatial Data ◽  
Convex Surface ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Future Research ◽  
Two Dimensional ◽  
Thematic Maps ◽  
Research Directions ◽  
Future Research Directions ◽  
The Many

The theory of cartographic projections is a tool which can present the convex surface of the Earth on the plane. Of the many types of maps, thematic maps perform an important function due to the wide possibilities of adapting their content to current needs. The limitation of classic maps is their two-dimensional nature. In the era of rapidly growing methods of mass acquisition of spatial data, the use of flat images is often not enough to reveal the level of complexity of certain objects. In this case, it is necessary to use visualization in three-dimensional space. The motivation to conduct the study was the use of cartographic projections methods, spatial transformations, and the possibilities offered by thematic maps to create thematic three-dimensional map imaging (T3DMI). The authors presented a practical verification of the adopted methodology to create a T3DMI visualization of the marina of the National Sailing Centre of the Gdańsk University of Physical Education and Sport (Poland). The profiled characteristics of the object were used to emphasize the key elements of its function. The results confirmed the increase in the interpretative capabilities of the T3DMI method, relative to classic two-dimensional maps. Additionally, the study suggested future research directions of the presented solution.

scholarly journals Polymorphic gallium for active resonance tuning in photonic nanostructures: from bulk gallium to two-dimensional (2D) gallenene

Nanophotonics ◽  
2020 ◽  
Vol 9 (14) ◽  
pp. 4233-4252
Author(s):  
Yael Gutiérrez ◽  
Pablo García-Fernández ◽  
Javier Junquera ◽  
April S. Brown ◽  
Fernando Moreno ◽  
...  
Keyword(s):  
Optical Properties ◽  
Room Temperature ◽  
Phase Change Materials ◽  
Two Dimensional ◽  
Active Materials ◽  
Promising Candidate ◽  
Plasmonic Structures ◽  
Resonance Tuning ◽  
The Many ◽  
Optical Behavior

AbstractReconfigurable plasmonics is driving an extensive quest for active materials that can support a controllable modulation of their optical properties for dynamically tunable plasmonic structures. Here, polymorphic gallium (Ga) is demonstrated to be a very promising candidate for adaptive plasmonics and reconfigurable photonics applications. The Ga sp-metal is widely known as a liquid metal at room temperature. In addition to the many other compelling attributes of nanostructured Ga, including minimal oxidation and biocompatibility, its six phases have varying degrees of metallic character, providing a wide gamut of electrical conductivity and optical behavior tunability. Here, the dielectric function of the several Ga phases is introduced and correlated with their respective electronic structures. The key conditions for optimal optical modulation and switching for each Ga phase are evaluated. Additionally, we provide a comparison of Ga with other more common phase-change materials, showing better performance of Ga at optical frequencies. Furthermore, we first report, to the best of our knowledge, the optical properties of liquid Ga in the terahertz (THz) range showing its broad plasmonic tunability from ultraviolet to visible-infrared and down to the THz regime. Finally, we provide both computational and experimental evidence of extension of Ga polymorphism to bidimensional two-dimensional (2D) gallenene, paving the way to new bidimensional reconfigurable plasmonic platforms.

scholarly journals Performance of SCAN Meta-GGA Functionals on Nonlinear Mechanics of Graphene-Like g-SiC

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 120
Author(s):  
Qing Peng
Keyword(s):  
Mechanical Properties ◽  
Density Functional ◽  
Large Strains ◽  
Two Dimensional ◽  
Nonlinear Mechanics ◽  
Generalized Gradient ◽  
Mechanics Of Materials ◽  
Nonlinear Mechanical ◽  
Direct Band ◽  
Simulations And Modeling

Although meta-generalized-gradient approximations (meta-GGAs) are believed potentially the most accurate among the efficient first-principles calculations, the performance has not been accessed on the nonlinear mechanical properties of two-dimensional nanomaterials. Graphene, like two-dimensional silicon carbide g-SiC, has a wide direct band-gap with applications in high-power electronics and solar energy. Taken g-SiC as a paradigm, we have investigated the performance of meta-GGA functionals on the nonlinear mechanical properties under large strains, both compressive and tensile, along three deformation modes using Strongly Constrained and Appropriately Normed Semilocal Density Functional (SCAN) as an example. A close comparison suggests that the nonlinear mechanics predicted from SCAN are very similar to that of Perdew-Burke-Ernzerhof (PBE) formulated functional, a standard Density Functional Theory (DFT) functional. The improvement from SCAN calculation over PBE calculation is minor, despite the considerable increase of computing demand. This study could be helpful in selection of density functionals in simulations and modeling of mechanics of materials.

Two dimensional Dirac carbon allotropes from graphene

Nanoscale ◽  
2014 ◽  
Vol 6 (2) ◽  
pp. 1113-1118 ◽  
Author(s):  
Li-Chun Xu ◽  
Ru-Zhi Wang ◽  
Mao-Sheng Miao ◽  
Xiao-Lin Wei ◽  
Yuan-Ping Chen ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Carbon Allotropes

Monitoring the Travel Characteristics of High Voltage Circuit Breaker Based on TLD

2014 ◽  
Vol 687-691 ◽  
pp. 938-941
Author(s):  
Bao Shu Li ◽  
Shang Chen ◽  
Xian Ping Zhao ◽  
Wei Hua Niu
Keyword(s):  
Mechanical Properties ◽  
Circuit Breaker ◽  
Travel Speed ◽  
Video Tracking ◽  
Two Dimensional ◽  
High Voltage Circuit Breaker ◽  
Vacuum Circuit Breaker ◽  
Tracking Technology ◽  
Methods Of Measurement ◽  
Speed Characteristic

For the circuit breaker, mechanical fault make up the largest share of the fault. In order to ensure reliable and secure power system can run,it is necessary to monitor the mechanical properties of the circuit breaker,which includes monitoring the breaker trip.By TLD video tracking technology ZN65-12 vacuum circuit breaker mechanical properties were measured,obtain a two-dimensional direction of travel, speed characteristic curves.The experimental results show that the error of the method used to obtain a circuit breaker stroke, speed and other parameters of not more than 1mm,compared with traditional methods of measurement can get richer information.

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