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


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a530659.pdf


Report Date : 06 Sep 2010


Pagination or Media Count : 43


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