Viscoelastic Effect on the Fracture Toughness of GFRP: Experimental Approach
The dynamic fracture tests were carried out for a glass fiber reinforced plastic specimen with a crack and dynamic fracture toughness was evaluated by examination of cracking at an initial slit root. Before the crack initiated at the slit root, a whitened damage zone was created surrounding the slit tip. The damage zone consists of micro cracking in the matrix, debonding between a fiber and the matrix, and fracture of the fiber. The comparison of the dynamic fracture toughness and the static fracture toughness value shows that the former is around 12 MPa√m and apparently higher than the later, which is 7 MPa√m. To understand those experimental results and mechanics of the damage zone, a dynamic debonding test was carried out and dynamic bonding strength was estimated as around 70 MPa.
Ichsan Setya Putra and Djoko Suharto
S. S. Lana et al., "Viscoelastic Effect on the Fracture Toughness of GFRP: Experimental Approach", Key Engineering Materials, Vols. 306-308, pp. 745-750, 2006