INVESTIGATION OF THE ADDING NANO PARTICLES TO COMPOSITE MATERIAL UNDER HIGH STRAIN RATE TORSION WITH HYGROTHERMAL EFFECT

This research aim to explain effect of high strain rate torsion on fiber glass / epoxy composite and study effect adding nano particles (carbon and alumina) with weight percentage 4% finally, explain the effect temperature and humidity on the specimen under high strain rate torsion test. Using the torsional Hopkinson split bar to applied torsion load under angle of the twist θ = 10°. It can be ssen that the maximum (shear stress and shear strain ) of the composite increases with adding nano particles by rate (36.8% and 7.4 %) with adding 4% nano carbon and it increase by rate ( 42.45% , 15.17 %) with adding 4% nano alumina, So the shear stress ,shear strain and shear strain rate of all specimens decrease with increasing (temperature and humidity) with different percentages. In other hand, the modifying Johnson-Cook constitutive model is possible by adding parameter represented the humidity effect that simulate the experimental results ,then the error percentages between the experimental results and theoretical results which range (0.065 % and 22.04%) is found.