In this research, multi-walled carbon nanotubes (MWCNTs) are used as the reinforcement in an epoxy resin with weight percentages (0, 0.2, 0.4, 0.6, 0.8, 1) wt%, respectively, by using both direct (nonhomogeneous) and homogeneous dispersion mixing processes to prepare (epoxy/MWCNTs) nanocomposites. Tensile and drop weight impact tests are used to evaluate mechanical properties of the composites. Results show that homogeneous dispersion has a great effect on enhancing mechanical properties of multi-wall carbon nanotube reinforced composites. Adding 0.2 wt% of MWCNTs enhances and increases tensile properties, and adding 0.6 wt% of MWCNTs enhances impact properties.
Impact characteristics of Epoxy matrix composites is investigated by impact machine. Four different types of reinforcement are used in the experimental works: type one: 1.9wt% steel fiber, 1.9wt% carbon fiber,1.9 wt% carbon nanotube, 1.9 wt% woven carbon fiber. This work shows that reinforcing epoxy with (1.9 wt% of woven carbon fiber) improves the impact properties where energy, force and deformation values of impact test for this composite were 18.4J, 3580.59 N and 18 mm respectively while for epoxy were 2.927 J, 921.849 N and 18.413 mm respectively.
Finite element modeling has been conducted to investigate the effect of die radius fillet, tube wall thickness, and friction coefficient on both external and internal inversion for the aluminum tube. A 3D model was used to build the contact pair for the aluminum tube and the steel die. Due to the axial symmetry, a 45 o sector for the contact pair has been chosen. It has been found that there is an important role for those parameters to govern the inversion process and the mode of deformation beside the value of the applied force. No local buckling was seen in the external inversion in contrast with internal inversion. A good correlation for current results with experimental one that has been got by others.
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