國立虎尾科技大學 |

On Reduced Effective Modulus of Carbon Nanotubes.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	On Reduced Effective Modulus of Carbon Nanotubes./
作者:	Ahmed, Shahrior.
面頁冊數:	1 online resource (61 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:	9780355369137

On Reduced Effective Modulus of Carbon Nanotubes.
Ahmed, Shahrior.

On Reduced Effective Modulus of Carbon Nanotubes. - 1 online resource (61 pages)

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

Thesis (M.E.S.)

Includes bibliographical references

As one of the most promising nanostructured materials, vertically aligned carbon nanotubes (CNTs) demonstrate excellent electrical, thermal, and mechanical properties. Meanwhile, they are found to have a very low effective modulus despite each individual CNT having a high Young's modulus of around 1 TPa. Recent studies suggest that the inherent waviness of individual CNTs plays an important role in such low effective modulus of vertically aligned CNTs. However, as-growth individual CNTs always have a certain deviation from their growth axes. Such deviations have not been considered in the literature.

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

Mode of access: World Wide Web

ISBN: 9780355369137Subjects--Topical Terms:

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

554714
Electronic books.

On Reduced Effective Modulus of Carbon Nanotubes.
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100 1 $a Ahmed, Shahrior. $3 1179008
245 1 0 $a On Reduced Effective Modulus of Carbon Nanotubes.
264 0 $c 2017
300 $a 1 online resource (61 pages)
336 $a text $b txt $2 rdacontent
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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 As one of the most promising nanostructured materials, vertically aligned carbon nanotubes (CNTs) demonstrate excellent electrical, thermal, and mechanical properties. Meanwhile, they are found to have a very low effective modulus despite each individual CNT having a high Young's modulus of around 1 TPa. Recent studies suggest that the inherent waviness of individual CNTs plays an important role in such low effective modulus of vertically aligned CNTs. However, as-growth individual CNTs always have a certain deviation from their growth axes. Such deviations have not been considered in the literature.
520 $a In this thesis, the finite element method was implemented to calculate the effective modulus of various CNTs by considering CNT deviation characterized by different deviation angles. Straight, regular wavy and randomly wavy morphologies of CNTs were investigated for a wide range of deviation angles from 0° to 10°. It has been found that the effective modulus of a straight CNT without inherent waviness decreases with the increase of the deviation angle by 1~4 orders of magnitude under a clamped-free boundary condition. The effect of deviation angle is thus compared to the effect of waviness ratio reported in the literature. For regular wavy CNTs that are idealized by the sinusoidal shapes, increasing deviation angle will result in a greater reduction in modulus. But the effect decreases when a high waviness ratio is present. For randomly wavy CNTs, a certain deviation angle gave rise to an enhancement in the CNT modulus. The enhancement is found to be possibly attributed to the fact that the CNT waviness was mostly formed on a side of the growth axis. In addition, the effects of waviness ratio and wavelength were examined. The results have shown that the effective modulus of wavy CNTs is mainly governed by the waviness ratio and deviation angle and has limited dependence on wavelength. Nevertheless, the significant effects of deviation angle were not observed under clamped-pinned, clamped-clamped, or confinement conditions. It is concluded that the CNT deviation from growth axis can contribute a significant reduction in CNT modulus, and the effect can be effectively mitigated by applying additional constraints or confinements to the as-grown CNTs.
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=10618266 $z click for full text (PQDT)