Dynamic Compressive Behavior of Glass/Epoxy Composites Using Split Hopkinson Pressure Bar

Abstract

In this study, E-glass/epoxy composites were subjected to Split Hopkinson Pressure Bar (SHPB) tests to obtain the compressive properties of composite under the different strain rate values. Composite materials were manufactured by vacuum assisted resin infusion moulding (VARIM) method. Then cylindrical SHPB specimens with 6 mm diameter and 6 mm height were obtained by cutting the composite with water jet through the thickness. E-glass/epoxy specimen was connected to the SHPB test apparatus. The variation of strain according to time was obtained by using axial strain-gage. Then compressive stresses were calculated by using strain values, the modulus of elasticity and the area of the pressure bar, and the area of specimen. The variations of engineering stress according to the engineering strain and time, and engineering strain rate vs time were obtained under different velocities or strain rates. The results shows that velocity or strain rate has a significant effect on compressive properties of E-glass/epoxy composite.