The publication presents the experimental and numerical procedure used to determine the stress state in the photoelastic model of the reinforced beams. The fracture in the reinforced composite elements subjected to bending and their strength are closely related to several processes: matrix cracking, fiber plastic deformation or failure, interfacial debonding between matrix and fibers. The criterion of calculation of the maximum load has been derived out of two processes only: matrix cracking and the deformation of the reinforcement. The strain energy release rate G_C was calculated using the stress intensity factors (K_(II) and K_I) corresponding to the crack propagation of the matrix.
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