One way to take advantage of the marvelous properties of the carbon nanotubes consists in incorporating them into a matrix to build composite materials. The best candidates for this task are undoubtedly polymers thanks to their strength, toughness, low weight, and easy processing. A mixed model, numerical-analytical, is presented that allows one to predict the elastic properties of carbon nanotube (CNT)/polymer composites containing a random distribution of CNTs, while taking account of the curvature that they show when immersed in the polymer. A three-dimensional model, using a single CNT immersed in an infinite matrix, allows us to numerically evaluate the concentration tensor by evaluating the average nanotube strain. The Mori-Tanaka model uses this tensor to predict the effective elastic modulus of composites with CNTs randomly oriented. This hybrid approach represents an appreciable evolution over the micromechanical modeling  and can be applied to every nanostructured composites. To simulate the mechanical behavior of CNTs, a structural non linear model, previously developed , has been adopted; this model is a modified version of a known methodology [3-4]. To simulate the nanotube-matrix interface, interactions have been implemented.The new methodology has been validated by comparison with the results of laboratory tests performed on epoxy resin-CNTs composites. ReferencesA. Pantano, G. Modica, F. Cappello: Mat. Sci. and Eng. A, 486, 222-227, 2008.M. Garg, A. Pantano, M.C. Boyce: J. of Eng. Mat. and Tech., 129, 431-439, 2007.A. Pantano, M.C. Boyce, D.M. Parks: J. Mech. Phys. Solids, 52, 789-821, 2004.A. Pantano, M.C. Boyce, D.M. Parks: J. of Eng. Mat. and Tech., Trans. ASME, 126, 279-284, 2004.
|Numero di pagine||1|
|Stato di pubblicazione||Published - 2013|