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Mechanical instabilities in carbon n...

University of Pennsylvania.

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Mechanical instabilities in carbon nanotubes.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Mechanical instabilities in carbon nanotubes./
作者:	Yap, Hsao W.
面頁冊數:	164 p.
附註:	Adviser: Robert W. Carpick.
Contained By:	Dissertation Abstracts International68-11B.
標題:	Applied Mechanics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3292090
ISBN:	9780549345633

Mechanical instabilities in carbon nanotubes.
Yap, Hsao W.

Mechanical instabilities in carbon nanotubes. - 164 p.

Adviser: Robert W. Carpick.

Thesis (Ph.D.)--University of Pennsylvania, 2007.

We managed to observe consistent negative stiffness when multi -- walled carbon nanotubes (MWCNTs) and multi -- walled carbon nanofibers (MWCNFs) were axially compressed. Negative stiffness is a form of mechanical instability and when constrained, offers novel and enhanced viscoelastic properties to a system or composite. Lakes et al. showed that if composites comprise of a small percentage of negative stiffness inclusions, the overall viscoelastic damping increases dramatically under torsion. Most recently, they also showed that the viscoelastic or dynamic modulus of composites with negative stiffness inclusions exceeded that of diamond on several occasions. We postulate that the observed negative stiffness in MWCNT/MWCNFs is a result of shell buckling. This is based upon the observation that the experimentally determined axial critical buckling forces match well with predictions from elastic continuum models. These MWCNT/MWCNFs are compressed with an AFM probe. In a simplistic way, the AFM probe - MWCNT/F configuration could be viewed as a "composite". We then performed linear viscoelastic measurements on these "composites". It turned out that under cyclic axial compression, they exhibited enhanced viscoelastic damping too, not unlike what Lakes et al. observed on the larger scale.

ISBN: 9780549345633Subjects--Topical Terms:

1018410
Applied Mechanics.

Mechanical instabilities in carbon nanotubes.
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502 $a Thesis (Ph.D.)--University of Pennsylvania, 2007.
520 $a We managed to observe consistent negative stiffness when multi -- walled carbon nanotubes (MWCNTs) and multi -- walled carbon nanofibers (MWCNFs) were axially compressed. Negative stiffness is a form of mechanical instability and when constrained, offers novel and enhanced viscoelastic properties to a system or composite. Lakes et al. showed that if composites comprise of a small percentage of negative stiffness inclusions, the overall viscoelastic damping increases dramatically under torsion. Most recently, they also showed that the viscoelastic or dynamic modulus of composites with negative stiffness inclusions exceeded that of diamond on several occasions. We postulate that the observed negative stiffness in MWCNT/MWCNFs is a result of shell buckling. This is based upon the observation that the experimentally determined axial critical buckling forces match well with predictions from elastic continuum models. These MWCNT/MWCNFs are compressed with an AFM probe. In a simplistic way, the AFM probe - MWCNT/F configuration could be viewed as a "composite". We then performed linear viscoelastic measurements on these "composites". It turned out that under cyclic axial compression, they exhibited enhanced viscoelastic damping too, not unlike what Lakes et al. observed on the larger scale.
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