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A Numerical Study on Natural Frequency and Elastic Moduli of Wavy Carbon Nanotubes.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	A Numerical Study on Natural Frequency and Elastic Moduli of Wavy Carbon Nanotubes./
作者:	Karna, Nivesh.
面頁冊數:	1 online resource (54 pages)
附註:	Source: Masters Abstracts International, Volume: 57-02.
Contained By:	Masters Abstracts International57-02(E).
標題:	Mechanical engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9780355369120

A Numerical Study on Natural Frequency and Elastic Moduli of Wavy Carbon Nanotubes.
Karna, Nivesh.

A Numerical Study on Natural Frequency and Elastic Moduli of Wavy Carbon Nanotubes. - 1 online resource (54 pages)

Source: Masters Abstracts International, Volume: 57-02.

Thesis (M.E.S.)

Includes bibliographical references

Carbon nanotubes (CNTs) have extraordinary mechanical, electrical and thermal properties. They are used for mechanical applications due to their high tensile strength (150 GPa) and Young's modulus (~1 TPa). Current experimental and theoretical methods for characterizing the elastic properties of single CNT are mostly based on the assumption that CNTs are ideally straight. Inherent waviness, however, is present even in vertically aligned CNTs with well-controlled growth direction. Yet, CNT waviness has not been considered in determining the elastic modulus of CNTs.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355369120Subjects--Topical Terms:

557493
Mechanical engineering.
Index Terms--Genre/Form:

554714
Electronic books.

A Numerical Study on Natural Frequency and Elastic Moduli of Wavy Carbon Nanotubes.
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245 1 2 $a A Numerical Study on Natural Frequency and Elastic Moduli of Wavy Carbon Nanotubes.
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500 $a Source: Masters Abstracts International, Volume: 57-02.
500 $a Adviser: Xuejun Fan.
502 $a Thesis (M.E.S.) $c Lamar University - Beaumont $d 2017.
504 $a Includes bibliographical references
520 $a Carbon nanotubes (CNTs) have extraordinary mechanical, electrical and thermal properties. They are used for mechanical applications due to their high tensile strength (150 GPa) and Young's modulus (~1 TPa). Current experimental and theoretical methods for characterizing the elastic properties of single CNT are mostly based on the assumption that CNTs are ideally straight. Inherent waviness, however, is present even in vertically aligned CNTs with well-controlled growth direction. Yet, CNT waviness has not been considered in determining the elastic modulus of CNTs.
520 $a In this study, finite element method was implemented to compute natural frequencies of wavy CNTs. The frequency data can be used to determine both axial Young's modulus and shear modulus of CNTs based on continuum beam theories. Typical waviness configurations for CNT were studied, including sinusoidal and helical CNTs with waviness ratio ranging from 0.015 to 0.33. The calculated results show that the decrease in natural frequency due to helical waviness is more significant than sinusoidal waviness. As waviness ratio increases, the natural frequency could drop by up to 60% for helical CNTs and 50% for sinusoidal CNTs with isotropic material properties and high shear modulus. For the anisotropic material properties where shear modulus is several orders lower than Young's modulus the natural frequency could drop up to 2 orders of magnitude for helical CNTs, but the decrease of frequency in sinusoidal CNTs is still within 50% compared to straight CNTs. The normalized frequency, which is the ratio between the frequency of wavy CNT and straight CNT, was found to be invariant with CNT length at high shear modulus. However, when shear modulus becomes 3 orders below Young's modulus, the normalized frequency decreases with CNT length, particularly for helical CNTs. This study concludes that the waviness has significant effects on the natural frequency of CNTs at low shear modulus and should be considered in the future measurements of CNT elastic properties.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Mechanical engineering. $3 557493
655 7 $a Electronic books. $2 local $3 554714
690 $a 0548
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a Lamar University - Beaumont. $b Mechanical Engineering. $3 1179007
773 0 $t Masters Abstracts International $g 57-02(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10618244 $z click for full text (PQDT)