On the tensile behavior of hetero-junction carbon nanotubes

Yengejeh, Sadegh Imani; Zadeh, Mojtaba Akbar; Öchsner, Andreas

doi:10.1016/j.compositesb.2015.02.001

Cited by 18 publications

(13 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For modelling of SWCNT HJs, the NCM approach, which is based on the replacement of the C–C bonds by the equivalent beam elements, was employed. The bases for the application of continuum mechanics in order to describe the mechanical behaviour of CNT HJs are the established relations between inter-atomic potential energies of the molecular structure and strain energies of the equivalent continuum structure comprised of elastic beams, undergoing axial, bending and torsional deformations [ 35 , 38 ]. The input values for the FE model are given in Table 1 .…”

Section: Methodsmentioning

confidence: 99%

“…The elastic properties of HJs have been evaluated under the tensile [ 34 , 35 , 36 , 37 , 38 ] and torsion [ 27 , 35 , 39 , 40 , 41 ] loading conditions, using the NCM approach. Ghavamian et al and Yengejeh et al [ 35 , 42 ] used the NCM approach for studying the buckling behaviour of HJs.…”

Section: Introductionmentioning

confidence: 99%

“…Scarpa et al [ 34 ] also described this feature when analysing the tensile test results of (5, 5)–(10, 10) HJs, in order to calculate the Poisson’s ratio. Most of the studies on the evaluation of the HJ elastic properties are dealing with cone-heterojunctions [ 30 , 34 , 36 , 38 , 39 , 40 , 41 ], and only a few works described the mechanical behaviour of the HJs with bent connection [ 27 , 35 ]. The common finding of some of these works [ 27 , 35 , 36 , 38 , 39 , 40 ] is the reduction of the elastic properties of the HJs (their rigidities, Young’s and shear moduli), when compared to the elastic properties of the constituent SWCNTs.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mechanical Characterisation of Single-Walled Carbon Nanotube Heterojunctions: Numerical Simulation Study

et al. 2020

View full text Add to dashboard Cite

The elastic properties of single-walled carbon nanotube heterojunctions were investigated using conventional tensile, bending and torsion tests. A three-dimensional finite element model was built in order to describe the elastic behaviour of cone heterojunctions (armchair–armchair and zigzag–zigzag). This comprehensive systematic study, to evaluate the tensile, bending and torsional rigidities of heterojunctions, enabled the formulation analytical methods for easy assessment of the elastic properties of heterojunctions using a wide range of their geometrical parameters.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanical Characterisation of Single-Walled Carbon Nanotube Heterojunctions: Numerical Simulation Study

et al. 2020

View full text Add to dashboard Cite

show abstract

“…journal.ump.edu.my/jmes ◄ and deformation-induced crystallographic structures. Crystal-based FEM is a versatile continuum mechanics approach, which can be used for solving both elastic-plastic and purely elastic problems of multi-body systems and complex CNTs (> 1.0 x 10 5 atoms) model structures [4,[17][18][19][20][21]. In 2008, Yao et al [22] explored the buckling response of CNTs with different layers by applying a modified FEM.…”

Section: Introductionmentioning

confidence: 99%

Effects of geometric variations on buckling properties of carbon nanostructures: A finite element analysis

Golesorkhie¹,

Navi²

2020

JMES

View full text Add to dashboard Cite

Critical Bucking Load (CBL) is one of the essential parameters to describe the mechanic stabilities of materials, e.g. the low-dimensional carbon nanostructures. While the CBL of pristine carbon nanotubes have been previously investigated using the quantum mechanics-based calculations, the effect of geometrical variation on the CBL of carbon nanomaterials is rarely reported since it need considerably large atomic models, which needs high computational cost. In this study, both the analytical and Finite Element (FE) methods were employed to systematically explore the impact of atomic vacancies, shapes and heterostructures on the CBLs of carbon nanomaterials with the acceptable computational cost. Our studies on the pristine CNTs first demonstrate the validity of the method we used. After that, the systems with mono-/bi-/tri-/pinole-vacancies either on nanocones, nanotube, linearly-joined nanotubes or angle-adjoined were simulated and analyzed. Our results reveal that the CBL values decrease with the increase of the aspect ratio of all considered nanomaterials. Based on the obtained results, the CBL of nanocone with the aspect ratio of 1, reduces significantly, from 50 nN to 10 nN when the aspect ratio is 3. The CBL of homogeneous, capped, and joint CNTs reduces to below 2 nN when the aspect ratio is above 14. The introduction of geometric variations can greatly affect the CBL values. The larger atomic vacancy has more serious impact on the CBLs. The most highlighted impact is for the pinhole vacancy where the CBL reduces to up to 70% of the original value. Our studies on linearly-joint and angle-joint carbon hybrids further demonstrate that the CBL can also be affected by the boundary conditions and joint structures of the hybrids.

show abstract

“…Over the past two decades, it has been found that CNTs display favorable mechanical [Cadek et al, 2002] and optoelectronic properties [Vivien et al, 2002], high chemical inertness [Qureshi et al, 2009], low-thermal degradation [Tian et al, 2004], and can be effectively doped [Suriyasena Liyanage et al, 2014] and processed on a large scale for applied applications as structural fillers [Phang et al, 2006;Imani Yengejeh et al, 2017] or active or passive opto-electronic components [Talin et al, 2001]. In addition, studies exploring the mechanical properties and structural stability of other types of one-and twodimensional (2D) carbon nanostructures other than those of the single-walled CNTs (SWCNTs), such as fullerenes, nanocones and CNT hetero-junctions, are gradually becoming popular as these explore the potential for construction of rigid molecular templates for applied nano-and macro-molecular engineering applications [Imani Yengejeh et al, 2015]. Investigations concerning the physical properties of CNTs have been formally divided into two major streams of experimental and theoretical studies.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Structural Stability of Ideal (Defect-Free) and Structurally and Morphologically Degenerated Homogeneous, Linearly- and Angle-Adjoined Nanotubes and Cylindrical Fullerenes Under Axial Loading Using Finite Element Method

Yengejeh

Öchsner

Kazemi

et al. 2018

Int. J. Appl. Mechanics

Self Cite

View full text Add to dashboard Cite

We report on the structural stability of ideal (defect-free) and structurally and morphologically degenerate carbon nanotubes and nanotube junction systems under axial loading based on the finite element method. We estimated the values for critical buckling load for uncapped and capped single-walled carbon nanotubes (SWCNTs) and linear and angle-adjoined SWCNT heterojunctions in ideal and structurally degenerate systems containing single-, double-, triple-, pinhole- and pentagon–heptagon (i.e., 5–7) structural defects and also containing a substitutional nitrogen (N) atom inclusion under compressive loading. Absolute atomic vacancy (defect) concentration in studied SWCNTs models was assumed to be nil for ideal systems, and was up to 3.0 at.% for structurally and morphologically degenerate systems. It was found that all types of structural defects and the morphological N-defect had reduced the load carrying capacity and mechanical strength in all SWCNT systems studied. The SWCNT models containing physically large vacant sites, such as triple- and pinhole-defects, displayed significantly lower critical load values compared to the systems that contained only a single-, double- or triple-vacancies. In addition, we found that capped SWCNTs performed marginally better in critical load carrying capacity compared to uncapped SWCNT systems. Furthermore, majority of the investigated structures displayed reduced load in SWCNTs with narrower tube widths, proportional to the size and the type of the defect investigated. The effects of chirality, such as zigzag- versus armchair-type, on the structural stability of the investigated SWCNT models were also investigated.

show abstract

On the tensile behavior of hetero-junction carbon nanotubes

Cited by 18 publications

References 29 publications

Mechanical Characterisation of Single-Walled Carbon Nanotube Heterojunctions: Numerical Simulation Study

Mechanical Characterisation of Single-Walled Carbon Nanotube Heterojunctions: Numerical Simulation Study

Effects of geometric variations on buckling properties of carbon nanostructures: A finite element analysis

Numerical Analysis of the Structural Stability of Ideal (Defect-Free) and Structurally and Morphologically Degenerated Homogeneous, Linearly- and Angle-Adjoined Nanotubes and Cylindrical Fullerenes Under Axial Loading Using Finite Element Method

Contact Info

Product

Resources

About