FEM study on mechanical properties of nanocomposites reinforced by defective graphene sheets

2018 ◽  
Vol 40 (S2) ◽  
pp. E1084-E1093 ◽  
Author(s):  
Mohammad J. Ghasemi Parizi ◽  
Hossein Shahverdi ◽  
Mehdi Mondali
Keyword(s):  
Mechanical Properties ◽  
Graphene Sheets ◽  
Defective Graphene

Fracture and progressive failure of defective graphene sheets and carbon nanotubes

2009 ◽  
Vol 88 (4) ◽  
pp. 602-609 ◽  
Author(s):  
J.R. Xiao ◽  
J. Staniszewski ◽  
J.W. Gillespie
Keyword(s):  
Carbon Nanotubes ◽  
Progressive Failure ◽  
Graphene Sheets ◽  
Defective Graphene

Enhanced thermal and mechanical properties of epoxy composites by mixing noncovalently functionalized graphene sheets

2014 ◽  
Vol 72 (3) ◽  
pp. 453-472 ◽  
Author(s):  
Cen Zeng ◽  
Shaorong Lu ◽  
Xiane Xiao ◽  
Jian Gao ◽  
Lulu Pan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Epoxy Composites ◽  
Graphene Sheets ◽  
Functionalized Graphene ◽  
Thermal And Mechanical Properties

Mechanical properties of highly defective graphene: from brittle rupture to ductile fracture

2013 ◽  
Vol 24 (50) ◽  
pp. 505703 ◽  
Author(s):  
Lanqing Xu ◽  
Ning Wei ◽  
Yongping Zheng
Keyword(s):  
Mechanical Properties ◽  
Ductile Fracture ◽  
Brittle Rupture ◽  
Defective Graphene

scholarly journals Mechanical Properties and Deformation Mechanisms of Graphene Foams with Bi-Modal Sheet Thickness by Coarse-Grained Molecular Dynamics Simulations

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5622
Author(s):  
Shenggui Liu ◽  
Mindong Lyu ◽  
Chao Wang
Keyword(s):  
Mechanical Properties ◽  
Elastic Recovery ◽  
Structural Connectivity ◽  
High Stress ◽  
Sheet Thickness ◽  
Functional Materials ◽  
Deformation Mechanisms ◽  
Coarse Grained ◽  
Graphene Sheets ◽  
Graphene Foams

Graphene foams (GrFs) have been widely used as structural and/or functional materials in many practical applications. They are always assembled by thin and thick graphene sheets with multiple thicknesses; however, the effect of this basic structural feature has been poorly understood by existing theoretical models. Here, we propose a coarse-grained bi-modal GrF model composed of a mixture of 1-layer flexible and 8-layer stiff sheets to study the mechanical properties and deformation mechanisms based on the mesoscopic model of graphene sheets (Model. Simul. Mater. Sci. Eng. 2011, 19, 54003). It is found that the modulus increases almost linearly with an increased proportion of 8-layer sheets, which is well explained by the mixture rule; the strength decreases first and reaches the minimum value at a critical proportion of stiff sheets ~30%, which is well explained by the analysis of structural connectivity and deformation energy of bi-modal GrFs. Furthermore, high-stress regions are mainly dispersed in thick sheets, while large-strain areas mainly locate in thin ones. Both of them have a highly uneven distribution in GrFs due to the intrinsic heterogeneity in both structures and the mechanical properties of sheets. Moreover, the elastic recovery ability of GrFs can be enhanced by adding more thick sheets. These results should be helpful for us to understand and further guide the design of advanced GrF-based materials.

Algorithm for Generating Defective Graphene Sheets

2009 ◽  
Vol 5 (7) ◽  
pp. 1877-1882 ◽  
Author(s):  
David R. Nutt ◽  
Hilary Weller
Keyword(s):  
Graphene Sheets ◽  
Defective Graphene

Preparation and Characterization of In Situ Nanocomposites of Graphene Nanosheets/Polyurethane

2019 ◽  
Vol 814 ◽  
pp. 90-95 ◽  
Author(s):  
Guang Lei Lv ◽  
Yuan Yuan Li ◽  
Chen Fei ◽  
Zhi Hao Shan ◽  
Jing Gan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Tensile Strength ◽  
Graphene Nanosheets ◽  
Graphene Sheets ◽  
Microstructural Properties ◽  
Wear Performance ◽  
Polyurethane Composites

Graphene nanosheets/polyurethane (GNS/PU) was prepared in situ by polymerization technique for the manufacture of PU safety shoes soles. The graphene nanosheets/polyurethane composites were characterized for their mechanical properties, thermal conductivity and abrasion resistance, and comparison is made with those of the neat polyurethane. The microstructural properties of GNS/PU were characterized by SEM. The results show that with the increase of the amount of graphene within the range of weight-percentages analyzed, the tensile strength of the composites gradually increases. The tensile strength of the GNS/PU composites increased to 64.14 MPa with 2 wt% GNS, compared with 55.1 MPa for neat PU. When the graphene sheets reached 2 wt%, the abrasion volume reached 71 mm3. Compared with the pure PU, the wear performance of GNS/PU composites was significantly improved.

Simulation of the thermomechanical behavior of graphene/PMMA nanocomposites via continuum mechanics

2019 ◽  
Vol 11 (5) ◽  
pp. 655-669
Author(s):  
Androniki Tsiamaki ◽  
Nicolaos Anifantis
Keyword(s):  
Mechanical Properties ◽  
Accurate Method ◽  
Thermomechanical Properties ◽  
Van Der Waals Interactions ◽  
Monolayer Graphene ◽  
Graphene Sheets ◽  
Temperature Dependent ◽  
Content Type ◽  
Graphene Layers ◽  
Derived Properties

Purpose The purpose of this paper is to simulate and investigate the thermomechanical properties of graphene-reinforced nanocomposites. Design/methodology/approach The analysis proposed consists of two stages. In the first stage, the temperature-dependent mechanical properties of graphene are estimated while in the second stage, using the previously derived properties, the temperature-dependent properties of graphene-reinforced PMMA nanocomposites are investigated. In the first stage of the analysis, graphene is modeled discretely using molecular mechanics theory where the interatomic interactions are simulated by spring elements of temperature-dependent stiffness. The graphene sheets are composed of either one or more (up to five) monolayer graphene sheets connected via van der Waals interactions. However, in the second analysis stage, graphene is modeled equivalently as continuum medium and is positioned between two layers of PMMA. Also, the interphase between two materials is modeled as a medium with mechanical properties defined and bounded by the two materials. Findings The mechanical properties including Young’s modulus, shear modulus and Poisson’s ratio due to temperature changes are estimated. The numerical results show that the temperature rise and the multiplicity of graphene layers considered lead to a decrease of the mechanical properties. Originality/value The present analysis proposes an easy and accurate method for the estimation of the temperature-dependent mechanical properties of graphene-reinforced nanocomposites.

Modification of mechanical properties of vertical graphene sheets via fluorination

RSC Advances ◽  
2016 ◽  
Vol 6 (14) ◽  
pp. 11161-11166 ◽  
Author(s):  
Keivan Davami ◽  
Yijie Jiang ◽  
Chen Lin ◽  
John Cortes ◽  
Jeremy T. Robinson ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Sheets ◽  
Reduced Modulus

Fluorination can significantly enhance the reduced modulus of surfaces comprised of vertical graphene sheets.

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