Umang Jani - Academia.edu (original) (raw)
Papers by Umang Jani
Handbook of Polymer and Ceramic Nanotechnology
The dynamic characteristics of double-walled carbon nanotube-reinforced polymer matrix nanocompos... more The dynamic characteristics of double-walled carbon nanotube-reinforced polymer matrix nanocomposites is investigated here. The variation of the natural frequency of such composites is observed under the variation of geometrical parameters and volume fraction of double-walled carbon nanotubes. Three types of DWCNT, i.e., Armchair, Zigzag, and Chiral, are considered for the analysis. Double-walled carbon nanotube has been modeled using spring elements and lumped masses. To simulate the interlayer interactions and describe the van der Waals potentials between carbon atoms on different layers appropriate spring
Materials Technology, 2018
This manuscript deals with the investigation of double walled carbon nanocones for resonance base... more This manuscript deals with the investigation of double walled carbon nanocones for resonance based applications. Dynamic analysis of Double Walled Carbon Nanocones (DWCNCs) with cantilever boundary condition and different disclination angles of 60°, 120°, 180°, 240° and 300° has been done through atomistic molecular structure modeling. This analysis is performed to evaluate and identify the variation in stiffness’s exhibited by these nano devices when used for sensing applications. Pristine and Defective double walled nano cones have been analysed to study the effect of defect on the stiffness variation when used as sensing devices. Results suggest a considerable effect of disclination angle of nanocone on the exhibited frequency response. The results can be attributed to the fact that with the change in the disclination angle and defects there is a substantial amount of variation in the stiffness due to the change in the bond orientation of the nanocones.
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2020
This paper deals with the evaluation of the effective mechanical properties of carbon nanocone ce... more This paper deals with the evaluation of the effective mechanical properties of carbon nanocone centered composites using a 3D nanoscale representative volume element based on continuum mechanics. For extracting the effective material constants, the authors have taken the basis of theories of elasticity. The results constituting the effective Young's modulus of the composite and Poisson's ratio for different parameters stated above have been presented and validated with rule of mixtures. It can be clearly visualized from the results that the load-carrying capacities of carbon nanocones in the representative volume elements are quite significant and the same has been demonstrated with subsequent cases. Simulation-based modeling can show a considerable part in the improvement of carbon nanocone-based composites by providing results that help in appreciative of the performance of composites. Moreover, for a volume fraction of the CNC as 2.33% in a cylindrical representative volu...
Mechatronic Systems Design and Solid Materials, 2021
Procedia Technology, 2016
An atomistic-based dynamic crack model for recreating execution of carbon nanotubes by considerin... more An atomistic-based dynamic crack model for recreating execution of carbon nanotubes by considering vacancy defects is projected. The idea of the fracture model is taking into account the supposition that carbon nanotubes, when stacked, carry on like space-casing structures. The finite element method is utilized to analyse the nanotube structure and the molecular structural mechanics approach with beam element is used to simulate the non-linear force field of the CC bonds. The model has been applied to defected single walled chiral, arm chair and zigzag nanotubes subjected to critical tension. The defect presented here (model) is one absent atom at the centre of the nanotube. The anticipated crack advancement, failure stresses of the nanotubes correspond exceptionally well with sub-atomic mechanics model from the literature.
AIMS Materials Science
In the present manuscript an approach to modelling and simulation of nanocones has been suggested... more In the present manuscript an approach to modelling and simulation of nanocones has been suggested for their use as sensing mediums. The vibrational behaviours of bridged and cantilever Single-Walled Carbon nanocones are modelled using three-dimensional elastic beams of carbon- carbon bonds and atomic masses. Also, the dynamic analysis of bridged and cantilever configurations of these nanocones with different disclination angles of 60°, 120°, 180°, and 240° is performed to evaluate the variation in stiffness with different configurations. The analysis also exhibits the effect of change in the length of nanocones on the vibrational frequencies. For the said purpose a mass equivalent to a carbon atom has been added at the nodes. It is observed that increasing side length of a Single-Walled Carbon nanocones with a constant apex angle results in a reduction in the fundamental frequency. It is also clear from the results that Single-Walled Carbon nanocones with larger apex angles exhibit smaller values of fundamental frequencies. The results suggest that smaller lengths of nanocones are better candidates for sensing applications as they exhibit substantial change in the fundamental frequencies. It can be stated that with higher number of bonds and atoms Single-Walled Carbon nanocones undergoes substantial bending with large declination angle which can be considered as an important finding.
Handbook of Polymer and Ceramic Nanotechnology
The dynamic characteristics of double-walled carbon nanotube-reinforced polymer matrix nanocompos... more The dynamic characteristics of double-walled carbon nanotube-reinforced polymer matrix nanocomposites is investigated here. The variation of the natural frequency of such composites is observed under the variation of geometrical parameters and volume fraction of double-walled carbon nanotubes. Three types of DWCNT, i.e., Armchair, Zigzag, and Chiral, are considered for the analysis. Double-walled carbon nanotube has been modeled using spring elements and lumped masses. To simulate the interlayer interactions and describe the van der Waals potentials between carbon atoms on different layers appropriate spring
Materials Technology, 2018
This manuscript deals with the investigation of double walled carbon nanocones for resonance base... more This manuscript deals with the investigation of double walled carbon nanocones for resonance based applications. Dynamic analysis of Double Walled Carbon Nanocones (DWCNCs) with cantilever boundary condition and different disclination angles of 60°, 120°, 180°, 240° and 300° has been done through atomistic molecular structure modeling. This analysis is performed to evaluate and identify the variation in stiffness’s exhibited by these nano devices when used for sensing applications. Pristine and Defective double walled nano cones have been analysed to study the effect of defect on the stiffness variation when used as sensing devices. Results suggest a considerable effect of disclination angle of nanocone on the exhibited frequency response. The results can be attributed to the fact that with the change in the disclination angle and defects there is a substantial amount of variation in the stiffness due to the change in the bond orientation of the nanocones.
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2020
This paper deals with the evaluation of the effective mechanical properties of carbon nanocone ce... more This paper deals with the evaluation of the effective mechanical properties of carbon nanocone centered composites using a 3D nanoscale representative volume element based on continuum mechanics. For extracting the effective material constants, the authors have taken the basis of theories of elasticity. The results constituting the effective Young's modulus of the composite and Poisson's ratio for different parameters stated above have been presented and validated with rule of mixtures. It can be clearly visualized from the results that the load-carrying capacities of carbon nanocones in the representative volume elements are quite significant and the same has been demonstrated with subsequent cases. Simulation-based modeling can show a considerable part in the improvement of carbon nanocone-based composites by providing results that help in appreciative of the performance of composites. Moreover, for a volume fraction of the CNC as 2.33% in a cylindrical representative volu...
Mechatronic Systems Design and Solid Materials, 2021
Procedia Technology, 2016
An atomistic-based dynamic crack model for recreating execution of carbon nanotubes by considerin... more An atomistic-based dynamic crack model for recreating execution of carbon nanotubes by considering vacancy defects is projected. The idea of the fracture model is taking into account the supposition that carbon nanotubes, when stacked, carry on like space-casing structures. The finite element method is utilized to analyse the nanotube structure and the molecular structural mechanics approach with beam element is used to simulate the non-linear force field of the CC bonds. The model has been applied to defected single walled chiral, arm chair and zigzag nanotubes subjected to critical tension. The defect presented here (model) is one absent atom at the centre of the nanotube. The anticipated crack advancement, failure stresses of the nanotubes correspond exceptionally well with sub-atomic mechanics model from the literature.
AIMS Materials Science
In the present manuscript an approach to modelling and simulation of nanocones has been suggested... more In the present manuscript an approach to modelling and simulation of nanocones has been suggested for their use as sensing mediums. The vibrational behaviours of bridged and cantilever Single-Walled Carbon nanocones are modelled using three-dimensional elastic beams of carbon- carbon bonds and atomic masses. Also, the dynamic analysis of bridged and cantilever configurations of these nanocones with different disclination angles of 60°, 120°, 180°, and 240° is performed to evaluate the variation in stiffness with different configurations. The analysis also exhibits the effect of change in the length of nanocones on the vibrational frequencies. For the said purpose a mass equivalent to a carbon atom has been added at the nodes. It is observed that increasing side length of a Single-Walled Carbon nanocones with a constant apex angle results in a reduction in the fundamental frequency. It is also clear from the results that Single-Walled Carbon nanocones with larger apex angles exhibit smaller values of fundamental frequencies. The results suggest that smaller lengths of nanocones are better candidates for sensing applications as they exhibit substantial change in the fundamental frequencies. It can be stated that with higher number of bonds and atoms Single-Walled Carbon nanocones undergoes substantial bending with large declination angle which can be considered as an important finding.