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This study presents a simple analytical model to investigate wave propagation in 2D carbon nano‐onions (CNOs) and nitrogen‐doped carbon nano‐onions (N‐CNOs) lattices. Furthermore, the dispersion relationships of the waves and bandgaps in these lattices are derived based on Bloch's theorem. The CNOs and N‐CNOs lattices are modeled as infinite 2D mass‐in‐mass structures accurately assembled using linear springs. The Lennard–Jones potential energy is employed to obtain equivalent spring constants. A key finding of this research is the identification of bandgaps within all lattice structures, signifying regions where wave propagation is prohibited. The existence of these bandgaps offers potential for the advancement of adjustable nano‐scale metamaterials. [ABSTRACT FROM AUTHOR]

Carbon nano-onions (CNOs)-reinforced nanocomposites are one of the most attractive materials due to their excellent performance in many fields of applications. This review paper aims to provide a systematic, albeit selective, survey of innovative developments in CNO-derived nanocomposites. First, molecular structure, fabrication and purification methods, and various applications of the CNOs are briefly described. Their unique physical properties make them ideal nanofillers for matrices to enhance the final nanocomposite features. Therefore, an overview of the current literature discussing the synthesis of polymeric and inorganic nanocomposites is presented. Then, various computational tools that can be used for simulating and modeling the CNOs and their nanocomposites are introduced. Experimental studies pertinent to the mechanical properties of the CNOs-reinforced nanocomposites are presented, and the effects of the CNOs on the mechanical properties of nanocomposites are reviewed. Next, novel applications of these nanocomposites in the emerging fields of biomedical engineering, energy storage devices, and nano-sensing technologies are also detailed. This article would be inspirational and give new insights by providing valuable, up-to-date, and essential background information to develop new concepts and applications of these carbon-based nanocomposites. [ABSTRACT FROM AUTHOR]

A combination of chirality, anti-chirality, and re-entrant lattice pattern is proposed to form a new two-dimensional meta-structure, and a comprehensive parametric study is conducted by using experimental and numerical analysis. The proposed structure can undergo larger deformations without significant stress concentrations. Based on the verified finite element model, the effects of various geometrical parameters on the in-plane mechanical response of the structure are investigated. Results show that the thickness of the structure is the most dominant factor in affecting the Young modulus while other parameters can alter Poisson's ratio. In addition, the proposed structure exhibits tunable negative/near-zero Poisson's ratios. [ABSTRACT FROM AUTHOR]

Fullerenes, as single crystals, present exceptional mechanical and physical properties due to their hollow spherical molecular structure consisting of carbon atoms connected by covalent bonds. The idea of linking these allotropes of carbon to create monolayer networks has now been accomplished experimentally. The question that remains to be answered is if these synthesized single‐layered nanosheets of fullerene present comparable properties with graphene monolayers. To answer this important question and to estimate the full tensile stress–strain behavior of quasi‐tetragonal as well as quasi‐hexagonal configurations of C60 planar networks, several Molecular Dynamics simulations are performed in this work by using a new REAXFF and the AIREBO‐M potential. Various mechanical properties, such as Young's modulus, Poisson's ratio, ultimate tensile strength, ultimate tensile strain, and fracture energy at failure of C60 monolayers of several sizes, are computed and compared with the results reported in the literature. Furthermore, a comprehensive discussion is made regarding the significant influence of the adopted potential on the numerical predictions of the elastic mechanical and fracture behavior of the fullerene nanosheets. [ABSTRACT FROM AUTHOR]

In this paper, the effects of initial curvature and lattice core shape on the bending vibration of sandwich beams are investigated. The three-dimensional (3D) sandwich beam is simulated by combining a two-dimensional (2D) cross-sectional analysis with a one-dimensional (1D) nonlinear beam analysis. The sandwich beam is composed of two identical isotropic faces covering a lattice core. Four different lattice core structures are used to take into account the effect of core unit cell shape on the dynamic properties of the sandwich beam. The nonlinear governing equations of the sandwich beam are Discretized using a time-space scheme. Numerical results show that the lattice unit cell shape affects both in-plane and out of plane stiffness values and hence changes the dynamic behavior of the beam. Furthermore, it is observed that by changing the density ratio of the beam, modes veer away from each other at a specific value of density ratio for specific unit cell types. Moreover, the initial curvature of the beam is shown to affect the dynamics of the beam especially lower modes. Finally, it is obtained that the dynamics of the beam is different when it is initially curved or curved due to an applied end follower moment. [ABSTRACT FROM AUTHOR]