Title : On the enhanced in interfacial strength through carbon/glass hybrid composite: mode I fatigue delamination
Abstract:
The laminated hybrid composites (e.g., carbon/glass fibre) application creates diversity in material design – higher stacking sequence possibilities. The main question raised by the scientific community is: how carbon/glass hybrid laminate affects interfacial adhesion, considering physical quantification? This work aims to answer the previous question applying mode I fatigue delamination in hybrid and non-hybrid composite. The hybrid laminate shows a greater strain energy release ratio (SERR) for delamination growth, associated with higher resistance to overcome the interlaminar resistance presented by the carbon/glass/epoxy interface. This behaviour indicates a higher lifetime for hybrid laminates than non-hybrid composites. Following the Paris model, the SERR (ΔG) range related to crack propagation (da/dN) was similar for carbon fibre and fibreglass composite. The value of β represents the slope of the curve, a factor that indicates the need for energy for crack growth. The values presented are higher for the carbon fibre composite (12.5), intermediate for the fibreglass composite (11.7), and the lesser inclination for the CH (8.9). For the hybrid composite, the energy region range is significantly higher, associated with greater interfacial resistance. The hybrid composite exhibits a rougher surface trend due to micro-change in crack direction between carbon/epoxy and glass/epoxy interfaces. The maximal number of carbon/glass/epoxy interfaces in hybrid laminates is a feasible option for delamination resistance increase, resulting in longer fatigue life.
