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Effects of Interfacial Friction on the Damping Characteristics of Composites Containing Randomly Oriented Carbon Nanotube Ropes

Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA

Jin H. Huang

Department of Mechanical and Computer-aided Engineering, Feng Chia University, Taichung 40724, Taiwan

K. W. Wang

Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA, kwwang{at}psu.edu

C. E. Bakis

Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802, USA

This article presents a model for describing the damping characteristics of uniaxially stressed polymeric composites filled with randomly oriented single-wall nanotube (SWNT) ropes. A close-packed lattice consisting of seven nanotubes in hexagonal array is used to present the nanoropes. The composite is described as a three-phase system composed of a resin, a resin sheath acting as a shear transfer zone, and SWNT ropes. The concept of ‘stick-slip’ motion caused by frictional contacts is proposed to describe the load transfer behavior between individual nanotubes and between a nanotube rope and a sheath. The results of the analytical study show that both the Young’s modulus and the loss factor of the composite are sensitive to stress magnitude. Also, to show the inter-tube sliding effects due to nanotube aggregation, the Young’s moduli and the loss factors of composites filled with aligned SWNTs, aligned nanoropes, and randomly oriented nanoropes are compared.

Key Words: carbon nanotube ropes • composites • damping • debonding • interfacial friction

Journal of Intelligent Material Systems and Structures, Vol. 17, No. 3, 217-229 (2006)
DOI: 10.1177/1045389X06056063


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