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  • Joshi, Anand Y.  (9)
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  • 1
    Online Resource
    Online Resource
    Analysis of Crack Propagation in Fixed-Free Single-Walled Carbon Nanotube Under Tensile Loading Using XFEM
    ASME International ; 2010
    In:  Journal of Nanotechnology in Engineering and Medicine Vol. 1, No. 4 ( 2010-11-01)
    Details
    In: Journal of Nanotechnology in Engineering and Medicine, ASME International, Vol. 1, No. 4 ( 2010-11-01)
    Abstract: Fracture mechanics at the nanoscale level is a very complex phenomenon, whereas the macroscale fracture mechanics approach can be employed for nanoscale to simulate the effect of fracture in single-walled carbon nanotubes (SWCNTs). In this study, an extended finite element method is used to simulate crack propagation in carbon nanotubes. The concept of the model is based on the assumption that carbon nanotubes, when loaded, behave like space frame structures. The nanostructure is analyzed using the finite element method, and the modified Morse interatomic potential is used to simulate the nonlinear force field of the C–C bonds. The model has been applied to single-walled zigzag, armchair, and chiral nanotubes subjected to axial tension. The contour integral method is used for the calculation of the J-integral and stress intensity factors (SIFs) at various crack locations and dimensions of nanotubes under tensile loading. A comparative study of results shows the behavior of cracks in carbon nanotubes. It is observed that for the smaller length of nanotube, as the diameter increased, the stress intensity factor is linearly varied while for the longer nanotube, the variation in stress intensity factor is nonlinear. It is also observed that as the crack is oriented closer to the loading end, the stress intensity factor shows higher sensitivity to smaller lengths, which indicates more chances for crack propagation and carbon nanotube breakage. The SIF is found to vary nonlinearly with the diameter of the SWCNT. Also, it is found that the predicted crack evolution, failure stresses, and failure strains of the nanotubes correlate very well with molecular mechanics simulations from literature.
    Type of Medium: Online Resource
    ISSN: 1949-2944 , 1949-2952
    URL: Article
    DOI: 10.1115/1.4002417
    Language: English
    Publisher: ASME International
    Publication Date: 2010
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  • 2
    Online Resource
    Online Resource
    Vibration Response Analysis of Doubly Clamped Single Walled Wavy Carbon Nanotube Based Nanomechanical Sensors
    ASME International ; 2010
    In:  Journal of Nanotechnology in Engineering and Medicine Vol. 1, No. 3 ( 2010-08-01)
    Details
    In: Journal of Nanotechnology in Engineering and Medicine, ASME International, Vol. 1, No. 3 ( 2010-08-01)
    Abstract: In this paper, the vibration signature of straight and wavy single walled carbon nanotube (SWCNT) doubly clamped at a source and a drain has been analyzed and is used to represent single mode resonator. The previous study showed the experimentally measured resonance frequencies of carbon nanotubes (CNTs) for straight beams CNT have been used. However, from photomicrographic images of CNTs, it is clear that they are not straight and they have some significant surface deviation such as waviness or curvature associated with them. In the present study; the vibration response analysis of CNTs with waviness has been done. The results showed the sensitivity of the SWCNTs having different waviness to mass (attached at different position along the length of a doubly clamped SWCNT) and different lengths. This study explores the effect of waviness on the mass sensitivity of a nanomechanical resonator.
    Type of Medium: Online Resource
    ISSN: 1949-2944 , 1949-2952
    URL: Article
    DOI: 10.1115/1.4001897
    Language: English
    Publisher: ASME International
    Publication Date: 2010
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  • 3
    Online Resource
    Online Resource
    Effect of chirality and atomic vacancies on dynamics of nanoresonators based on SWCNT
    Emerald ; 2011
    In:  Sensor Review Vol. 31, No. 1 ( 2011-01-25), p. 47-57
    Details
    In: Sensor Review, Emerald, Vol. 31, No. 1 ( 2011-01-25), p. 47-57
    Abstract: The purpose of this paper is to explore the use of chiral single‐walled carbon nanotubes (SWCNTs) as mass sensors. Analysis of SWCNT with chiralities is performed using an atomistic finite element model based on a molecular structural mechanics approach. Design/methodology/approach The cantilever carbon nanotube (CNT) is modeled by considering it as a space frame structure similar to three‐dimensional beams and point masses. The elastic properties of the beam element are calculated by considering mechanical characteristics of covalent bonds between the carbon atoms in the hexagonal lattice. The mass of each beam element is assumed as point mass at nodes coinciding with carbon atoms. An atomistic simulation approach is used to find the natural frequencies and to study the effects of defect like atomic vacancies in CNTs on the resonant frequency. The migration of the atomic vacancies along the length is observed for different chiralities. Findings A reduction in the simulated natural frequency is observed with the maximum value occurring, when the vacancy is found nearer to the fixed end. It is quite evident from the simulation results that the effect of vacancies is significant, and the effect diminishes at 10 −2 femtograms mass. Using the higher modes of vibration of SWCNT‐based mass sensors, the amount and the position of the mass on the nanotube can be identified. Originality/value CNT have been used as mass sensors extensively. The present approach is focused to explore the use of chiral SWCNT as sensing device with vacancy defect in it. The variation of the atomic vacancies in CNT along the length has been taken and is analyzed for different chiralities. The effects of defect like atomic vacancies in CNTs on the resonant frequency have been analyzed and observed that the maximum reduction in natural frequency occurs when the vacancy is found nearer to the fixed end due to large stiffness variation.
    Type of Medium: Online Resource
    ISSN: 0260-2288
    URL: Article
    DOI: 10.1108/02602281111099080
    Language: English
    Publisher: Emerald
    Publication Date: 2011
    detail.hit.zdb_id: 1477376-4
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  • 4
    Online Resource
    Online Resource
    The Effect of Pinhole Defect on Dynamic Characteristics of Single Walled Carbon Nanotube Based Mass Sensors
    American Scientific Publishers ; 2011
    In:  Journal of Computational and Theoretical Nanoscience Vol. 8, No. 4 ( 2011-04-01), p. 776-782
    Details
    In: Journal of Computational and Theoretical Nanoscience, American Scientific Publishers, Vol. 8, No. 4 ( 2011-04-01), p. 776-782
    Type of Medium: Online Resource
    ISSN: 1546-1955 , 1546-1963
    URL: Article
    DOI: 10.1166/jctn.2011.1752
    Language: English
    Publisher: American Scientific Publishers
    Publication Date: 2011
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  • 5
    Online Resource
    Online Resource
    The effect of pinhole defect on vibrational characteristics of single walled carbon nanotube
    Elsevier BV ; 2011
    In:  Physica E: Low-dimensional Systems and Nanostructures Vol. 43, No. 5 ( 2011-3), p. 1040-1045
    Details
    In: Physica E: Low-dimensional Systems and Nanostructures, Elsevier BV, Vol. 43, No. 5 ( 2011-3), p. 1040-1045
    Type of Medium: Online Resource
    ISSN: 1386-9477
    URL: Article
    DOI: 10.1016/j.physe.2010.12.011
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2011
    detail.hit.zdb_id: 1466595-5
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  • 6
    Online Resource
    Online Resource
    Dynamic Analysis of a Clamped Wavy Single Walled Carbon Nanotube Based Nanomechanical Sensors
    ASME International ; 2010
    In:  Journal of Nanotechnology in Engineering and Medicine Vol. 1, No. 3 ( 2010-08-01)
    Details
    In: Journal of Nanotechnology in Engineering and Medicine, ASME International, Vol. 1, No. 3 ( 2010-08-01)
    Abstract: This paper deals with the dynamic analysis of carbon nanotube with surface deviation along its axis. The type of carbon nanotube used in this analysis is a single-walled carbon nanotube that is doubly clamped at a source and a drain and this type of nanotube is used to represent a single mode resonator. In previous studies, experimentally measured resonance frequencies of carbon nanotubes have been used along with classical beam theory for straight beams. However, it is found that these carbon nanotubes are not straight, and that they have some significant surface deviation associated with them. The resonant frequency of the doubly clamped single walled carbon nanotube (SWCNT) with deviation (waviness) has been investigated. The results showed the sensitivity of the single-walled carbon nanotubes having different waviness to different masses (attached at the center of a doubly clamped SWCNT) and different lengths. The sensitivity of resonant frequency shifts to tube length and waviness has been demonstrated. The vibration signature exhibits superharmonic and subharmonic responses with different levels of mass. The vibration spectra of CNT with varying attached mass from 10−5 fg to 10−3 fg show dense signature near peak of excitation. It is found that with the increase in mass attached to CNT with 60 nm length, the peak excitation appears in the vibration signature in chaotic nature with reduced vibration amplitude.
    Type of Medium: Online Resource
    ISSN: 1949-2944 , 1949-2952
    URL: Article
    DOI: 10.1115/1.4002072
    Language: English
    Publisher: ASME International
    Publication Date: 2010
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  • 7
    Online Resource
    Online Resource
    Vibration signature analysis of single walled carbon nanotube based nanomechanical sensors
    Elsevier BV ; 2010
    In:  Physica E: Low-dimensional Systems and Nanostructures Vol. 42, No. 8 ( 2010-6), p. 2115-2123
    Details
    In: Physica E: Low-dimensional Systems and Nanostructures, Elsevier BV, Vol. 42, No. 8 ( 2010-6), p. 2115-2123
    Type of Medium: Online Resource
    ISSN: 1386-9477
    URL: Article
    DOI: 10.1016/j.physe.2010.03.033
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2010
    detail.hit.zdb_id: 1466595-5
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  • 8
    Online Resource
    Online Resource
    Zeptogram scale mass sensing using single walled carbon nanotube based biosensors
    Elsevier BV ; 2011
    In:  Sensors and Actuators A: Physical Vol. 168, No. 2 ( 2011-8), p. 275-280
    Details
    In: Sensors and Actuators A: Physical, Elsevier BV, Vol. 168, No. 2 ( 2011-8), p. 275-280
    Type of Medium: Online Resource
    ISSN: 0924-4247
    URL: Article
    DOI: 10.1016/j.sna.2011.04.031
    RVK:
    ZN 0001
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2011
    detail.hit.zdb_id: 1026063-8
    detail.hit.zdb_id: 1500729-7
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  • 9
    Online Resource
    Online Resource
    Nonlinear Dynamic Analysis of Single-Walled Carbon Nanotube Based Mass Sensor
    ASME International ; 2011
    In:  Journal of Nanotechnology in Engineering and Medicine Vol. 2, No. 4 ( 2011-11-01)
    Details
    In: Journal of Nanotechnology in Engineering and Medicine, ASME International, Vol. 2, No. 4 ( 2011-11-01)
    Abstract: In previous studies, experimentally measured resonance frequencies of carbon nanotubes have been used along with classical beam theory for straight beams. However, it is found that these carbon nanotubes are not straight, and that they have some significant surface deviation associated with them. This paper deals with the nonlinear vibration analysis of a wavy single-walled carbon nanotube based mass sensor, which is doubly clamped at a source and a drain. Nonlinear oscillations of a single-walled carbon nanotube excited harmonically near its primary resonance are considered. The carbon nanotube is excited by the addition of an excitation force. The modeling is carried out using the elastic continuum beam theory concept, which involves stretching of the central plane and phenomenological damping. This model takes into account the existence of waviness in carbon nanotubes. The equation of motion involves two nonlinear terms due to the curved geometry and the stretching of the central plane. The dynamic response of the carbon nanotube based mass sensor is analyzed in the context of the time response, Poincaré maps, and fast Fourier transformation diagrams. The results show the appearance of instability and chaos in the dynamic response as the mass on carbon nanotube is changed. Period doubling and mechanism of intermittency have been observed as the routes to chaos. The appearance of regions of periodic, subharmonic, and chaotic behavior is observed to be strongly dependent on mass and the geometric imperfections of carbon nanotube. Poincaré maps and frequency spectra are used to elucidate and to illustrate the diversity of the system behavior.
    Type of Medium: Online Resource
    ISSN: 1949-2944 , 1949-2952
    URL: Article
    DOI: 10.1115/1.4005663
    Language: English
    Publisher: ASME International
    Publication Date: 2011
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