Accession Number:

ADA530659

Title:

Multiscale Mass-Spring Models of Carbon Nanotube Foams

Descriptive Note:

Journal article

Corporate Author:

CALIFORNIA INST OF TECH PASADENA GRADUATE AEROSPACE LABS

Personal Author(s):

• Fraternali, F.
• Blesgen, T.
• Amendola, A.
• Daraio, C.

Report Date:

2010-09-06

Pagination or Media Count:

43.0

Abstract:

This article is concerned with the mechanical properties of dense, vertically aligned carbon nanotube foams subject to one-dimensional compressive loading. We develop a discrete model directly inspired by the micromechanical response reported experimentally for CNT foams, where in nitesimal portions of the tubes are represented by collections of uniform bi-stable springs. Under cyclic loading, the given model predicts an initial elastic deformation a non-homogeneous buckling regime, and a densi cation response, accompanied by a hysteretic unloading path. We compute the dynamic dissipation of such a model through an analytic approach. The continuum limit of the microscopic spring chain de nes a mesoscopic dissipative element micro-meso transition, which represents a nite portion of the foam thickness. An upper scale model formed by a chain of nonuniform mesoscopic springs is employed to describe the entire CNT foam. A numerical approximation illustrates the main features of the proposed multiscale approach. Available experimental results on the compressive response of CNT foams are tted with excellent agreement.

Descriptors:

• *CARBON NANOTUBES
• *MECHANICAL PROPERTIES
• *MICROMECHANICS
• *SCALE MODELS
• APPROXIMATION(MATHEMATICS)
• BUCKLING
• COMPRESSIVE PROPERTIES
• DISSIPATION
• DYNAMICS
• ELASTIC PROPERTIES
• HYSTERESIS
• LOADS(FORCES)
• MICROSCOPY
• THICKNESS
• UNLOADING

Subject Categories:

• Inorganic Chemistry
• Properties of Metals and Alloys
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE