Figure 3.

R-curves of silanized and non-silanized experimental flake-reinforced composites. Fracture toughness is shown in terms of stress intensity K_R (a) and nonlinear elastic fracture, J_R (b). Included were data on conventional composites (particles, grey dots):K_R data taken from Shah et al. [22] (see Figure 3(a)) and J_R data from Wendler et al. [6] and De Souza et al. [21] (see Figure 3(b)). Glass-reinforced composite data (particles + orientated short-fibers, red dots) K_R and J_R from Tiu et al. [5] were added.