Nanofracture in graphene under complex mechanical stresses

Zhang, Bin; Mei, Lanjv; Xiao, Haifeng

doi:10.1063/1.4754115

Cited by 89 publications

(56 citation statements)

References 36 publications

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“…14). Zhang et al (2012a) investigated crack growth in a circular graphene sheet by prescribing the continuum K-field solution of displacements along the boundary. By tuning the stress intensity factors K I and K I I , they also demonstrated that the crack path can follow armchair or zigzag directions while zigzag is more preferable.…”

Section: Other Fracture Modes In Graphenementioning

confidence: 99%

Fracture of graphene: a review

2015

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Fracture is one of the most prominent concerns for large scale applications of graphene. In this paper, we review some of the recent progresses in experimental and theoretical studies on the fracture behaviors of graphene, with discussions touching theoretical strength, mode I fracture toughness, mixed mode fracture, chemical fracture, irradiation fracture, dynamic fracture, impact fracture, and sonication fracture. In spite of rapid developments in experiments and simulations, there are still significant yet unresolved issues related to the fracture of graphene, examples including: (1) Can one enhance the toughness of graphene with designed topological defects? (2) How does grain size affect the strength of polycrystalline graphene? (3) How do the out-of-plane effects (e.g., wrinkle caused by external loading or curvature induced by topological defects) influence the fracture of graphene? (4) Can one develop a continuum model with the ability to capture graphene fracture with complicated modes, such as shear fracture coupled with wrinkling deformation and tear fracture? (5) How does fracture occur when tearing a polycrystalline graphene sheet? (6) Can one control the fracture behavior of graphene by combing the chemical, irradiation and stress effect? (7) How fast can cracks propagate in graphene? (8) What is the behavior of interfacial cracks in graphene, i.e., cracks along the grain boundaries or interfaces of heterogeneous structures? (9) How does a multilayer graphene membrane break under high speed impact and why such structures can absorb a large amount of kinetic energy? (10) Can one tailor/design the graphene structures with controlled fracture? The intention here is not to provide complete answers to such questions, but to draw attention from the mechanics community to them as potential research topics.

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Section: Other Fracture Modes In Graphenementioning

confidence: 99%

Fracture of graphene: a review

2015

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“…Great efforts have been made in characterizing the mechanical properties of graphene [16,17]. Lee et al [14] reported that the Young's modulus and intrinsic strength of graphene is 1 ± 0.1 TPa and 130 ± 10 GPa respectively assuming the thickness of graphene as 0.335nm.…”

Section: Introductionmentioning

confidence: 99%

Graphene and its elemental analogue: A molecular dynamics view of fracture phenomenon

Rakib

Mojumder

Das

et al. 2017

Physica B: Condensed Matter

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Abstract-Graphene and some graphene like two dimensional materials; hexagonal boron nitride (hBN) and silicene have unique mechanical properties which severely limit the suitability of conventional theories used for common brittle and ductile materials to predict the fracture response of these materials. This study revealed the fracture response of graphene, hBN and silicene nanosheets under different tiny crack lengths by molecular dynamics (MD) simulations using LAMMPS. The useful strength of these two dimensional materials are determined by their fracture toughness. Our study shows a comparative analysis of mechanical properties among the elemental analogues of graphene and suggested that hBN can be a good substitute for graphene in terms of mechanical properties. We have also found that the pre-cracked sheets fail in brittle manner and their failure is governed by the strength of the atomic bonds at the crack tip. The MD prediction of fracture toughness shows significant difference with the fracture toughness determined by Griffth's theory of brittle failure which restricts the applicability of Griffith's criterion for these materials in case of nano-cracks. Moreover, the strengths measured in armchair and zigzag directions of nanosheets of these materials implied that the bonds in armchair direction have the stronger capability to resist crack propagation compared to zigzag direction.

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“…Molecular dynamics studies have shown that the critical stress intensity factor of graphene is temperature dependent, and it is around 3.5 MPa m 1/2 at 300 K [27,28]. Hydrogen functionalization significantly lowers the tensile strength of graphene allotropes [17]; shear strength of graphene also reduces with increasing hydrogen adatom concentration [18].…”

Section: Modeling Of Graphenementioning

confidence: 99%