Dynamic response and simulations of nanoparticle-enhanced composites

The dynamic modulus and damping, low-velocity impact and high-strain (Hopkinson bar) response of nanoparticle-enhanced composites and fly ash based fire resistant structural foams have been characterized. Molecular Dynamic (MD) simulations were also used for obtaining the elastic constants for different matrices reinforced with single and multi-wall carbon nanotubes (MWCNT). Experimental results on the dynamic and impact response of nylon 6,6 with MWCNT, vinyl ester with nanoclay and graphite platelets, and Eco-Core® foams are presented; along with some of the predictions from molecular simulations.An increase in dynamic modulus and marginal drop in damping was observed with the addition of multi-wall carbon nanotubes to pristine nylon 6,6. Addition of MWCNT was detrimental to the maximum load and energy absorption under low-velocity impact. However, an improvement in strength and energy absorption was observed with Hopkinson pressure bar apparatus at high-strain rates under compressive loading. Results obtained from molecular simulations show that MWCNTs are transversely isotropic, and the transverse properties are comparatively poor.