The effect of carbon nanotube dimensions and dispersion on the fatigue behavior of epoxy nanocomposites
作者： W Zhang , R C Picu , N Koratkar
DOI: 10.1088/0957-4484/19/28/285709
关键词: Dispersion (optics) 、 Fracture mechanics 、 Carbon nanotube 、 Nanotube 、 Nanocomposite 、 Epoxy 、 Composite material 、 Materials science 、 Structural material 、 Paris' law 、 Mechanical engineering 、 Electrical and Electronic Engineering 、 General Materials Science 、 Mechanics of Materials 、 Bioengineering 、 General chemistry
摘要: Fatigue is one of the primary reasons for failure in structural materials. It has been demonstrated that carbon nanotubes can suppress fatigue polymer composites via crack-bridging and a frictional pull-out mechanism. However, detailed study effects nanotube dimensions dispersion on behavior nanocomposites not performed. In this work, we show strong effect (i.e. length, diameter) quality crack growth suppression epoxy nanocomposites. We observe rates be significantly reduced by (1) reducing diameter, (2) increasing length (3) improving dispersion. qualitatively explain these observations using fracture mechanics model based nanotubes. By optimizing above parameters (tube diameter dispersion) demonstrate an over 20-fold reduction propagation rate nanocomposite compared to baseline (unfilled) epoxy.
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