Finite-element contact modeling of rough surfaces applied to Au-coated carbon nanotube composites
Finite-element contact modeling of rough surfaces applied to Au-coated carbon nanotube composites
Multiwalled carbon nanotubes (CNTs) have been used to improve the lifetime of the electrical contact of microelectromechanical system (MEMS) switches. The surface, usually gold-coated, demonstrates a complex structure. Due to the lateral gaps between the nanotubes, the sputtered gold penetrates into the top part of the CNT to a limited thickness and is supported by the rest of the CNT. The surface also presents a much higher roughness than metal surfaces. Based on the nanoindentation test, a finite-element smooth-contact model has been developed, and it was shown that the surface was best modeled as a bilayered structure. In this paper, roughness is considered in contact modeling. It is shown that roughness plays an important role in the contact behavior, and that the material properties, such as Young's modulus and hardness estimated from the nanoindentation tests, need to be reevaluated. It is also shown with finite element method (FEM) that the force-displacement behavior of the composite depends on the location of the indentation test.
329-337
Liu, Hong
e8808574-7eb8-459e-9539-110a1f76e117
Mcbride, John
d9429c29-9361-4747-9ba3-376297cb8770
March 2017
Liu, Hong
e8808574-7eb8-459e-9539-110a1f76e117
Mcbride, John
d9429c29-9361-4747-9ba3-376297cb8770
Liu, Hong and Mcbride, John
(2017)
Finite-element contact modeling of rough surfaces applied to Au-coated carbon nanotube composites.
IEEE Transactions on Components Packaging and Manufacturing Technology, 7 (3), .
(doi:10.1109/TCPMT.2016.2587905).
Abstract
Multiwalled carbon nanotubes (CNTs) have been used to improve the lifetime of the electrical contact of microelectromechanical system (MEMS) switches. The surface, usually gold-coated, demonstrates a complex structure. Due to the lateral gaps between the nanotubes, the sputtered gold penetrates into the top part of the CNT to a limited thickness and is supported by the rest of the CNT. The surface also presents a much higher roughness than metal surfaces. Based on the nanoindentation test, a finite-element smooth-contact model has been developed, and it was shown that the surface was best modeled as a bilayered structure. In this paper, roughness is considered in contact modeling. It is shown that roughness plays an important role in the contact behavior, and that the material properties, such as Young's modulus and hardness estimated from the nanoindentation tests, need to be reevaluated. It is also shown with finite element method (FEM) that the force-displacement behavior of the composite depends on the location of the indentation test.
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Accepted/In Press date: 17 June 2016
e-pub ahead of print date: 27 July 2016
Published date: March 2017
Organisations:
Mechatronics
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Local EPrints ID: 402401
URI: http://eprints.soton.ac.uk/id/eprint/402401
ISSN: 2156-3950
PURE UUID: 100687a8-4d1a-4c88-a982-30a23bc1368d
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Date deposited: 08 Nov 2016 14:21
Last modified: 16 Mar 2024 02:37
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Author:
Hong Liu
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