Page 74 - Polymer-based Nanocomposites for Energy and Environmental Applications

Preparation and properties of nanopolymer advanced composites: A review 51

22000
21000
Experimental data
20000 Model prediction
19000
Impact force (N) 17000
18000

16000
15000

14000
13000
12000
20 40 60 80
Impact energy (J)

Fig. 2.21 Model prediction versus experimental data [43].

Wang and Shen [44] have studied the large amplitude vibration and the nonlinear
bending of a sandwich plate with carbon nanotube-reinforced composite (CNTRC)
face sheets resting on an elastic foundation in thermal environments. The result
reveals that the nanotube volume fraction of face sheets and the core-to-face sheet
thickness ratio have a significant effect on the natural frequencies and the
load-bending moment curves of the plate, whereas this effect is less pronounced on
the nonlinear to linear frequency ratios and the load-deflection curves of the same
sandwich plate.
Shen and Zhu [45] have investigated the compressive post buckling under thermal
environments and thermal post buckling due to a uniform temperature rise that are
presented in a sandwich plate with carbon nanotube-reinforced composite
(CNTRC) face sheets resting on an elastic foundation. The results reveal that the foun-
dation stiffness, the temperature changes, the nanotube volume fraction of face sheet,
and the core-to-face sheet thickness ratio have significant effects on the compressive
buckling load and postbuckling behavior of the sandwich plate, whereas this effect on
the thermal postbuckling behavior is less pronounced for the same sandwich plate.
de Borbo ´n and Ambrosini [46] have made an experimental study of the dynamic
response of composite aluminum epoxy resin-CNT sandwich plates that are subjected
to blast loading. They have found that the permanent displacement is larger for the
plates with CNTs, as for uniform and localized blast loading, by indicating that the
inherent brittleness of epoxy resins has overcome by adding CNTs. On the other hand,
the composite material with CNTs exhibited a fracture pattern clearly more extended
than neat epoxy specimens (see Figs. 2.22 and 2.23). This indicates that the composite
material with CNTs exhibited better energy dissipation behavior than the neat epoxy
specimens. This higher fracture energy for the case of composites sandwich plates