EFFECT OF FIBER ORIENTATION ON THE DELAMINATION BEHAVIOUR OF GLASS-CARBON HYBRID INTERFACE

The delamination behavior of glass-carbon hybrid laminate with glass and carbon fiber on either side of the mid-plane was studied using double cantilever beam test. The stacking sequence and fiber orientation of the hybrid laminate was taken as [G0/G135/G90/G45/C/C//G/G/G45/G90/G135/G0]. Three different laminates were obtained by changing the fiber orientation of the mid-layers as C/C//G/G. Laminates were prepared by hand lay-up technique and post cured by compression. The test was conducted as per ASTM standard D5528. The strain energy release rate GIc calculated using modified beam theory method was found to be higher for the laminate with mid-layers as C90//G0 in comparison with that of the other two laminates. Fractographic analysis of the delaminated surfaces using scanning electron microscope indicates hackles, striations and fiber fracture. Hackles that provides more resistance to crack propagation leading to increase in inter laminar fracture toughness are observed in the glass fiber side of the specimen with C90//G0 interface